· PDF file4 Physical fundamentals and parameters 3 1 2 Integrated explosion protection Prevent the formation of potentially explosive atmospheres Prevent the ignition

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2 Introduction

The full range of Ex applications under control:ATEX (atmosphère explosive)Introduction

In many industries, the manufacture, processing, trans-port, or storage of combustible materials results in thecreation, or release into the surrounding environment, of gases, vapors, or mist. Other processes create combustible dust. An explosive atmosphere can form in conjunction with the oxygen in the air, resulting in an explosion if igni-ted.

Particularly in areas such as the chemical and petrochemical industries, the transport of crude oil and natural gas, themining industry, milling (e.g. grain and granular solids) and many other branches of industry, this can result in seriousinjury to personnel and damage to equipment.

To guarantee the highest possible level of safety in these areas, the legislatures of most countries have developedappropriate obligations in the form of laws, regulations and standards. In the course of globalization, it has been possible to make significant progress towards harmonizing guidelines for explosion protection.

With the Directive 94/9/EU the European Union creates the prerequisites for complete standardization because all newdevices must be approved in accordance with this directive since July 1, 2003.

The brochure "Explosion Protection Fundamentals" is designed to provide users and interested readers with an overview ofexplosion protection in conjunction with electrical equipment and systems. It also assists in decoding device labels.

However, it does not replace intensive study of the relevant fundamentals and guidelines when planning and installing electrical systems.

Introduction 3

Index

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Physical principles and parameters . . . . . . . . . . . . . 4

Classification of explosion-protected equipment . . . . . . . . . . . . . . . 8

Low-voltage product range for hazardous areas . 13

Further information . . . . . . . . . . . . . . . . . . . . . . . . . 20

4 Physical fundamentals and parameters

3

1

2

Integrated explosion protection

Prevent the formation of potentially

explosive atmospheres

Prevent the ignitionof potentially explosive

atmospheres

Restrict the effectsof an explosion

to a negligible level

EXPLOSION

Combustiblesubstances

Ignition source

Oxygen

Physical fundamentals and parameters

Explosion

An explosion is the sudden chemical reaction of a combustible substance with oxygen, involving the release of high energy. Combustible substances can be present in the form of gases, mist, vapor, or dust. An explosion can only take place if thefollowing three factors coincide:

1. Combustible substance (in the relevant distribution and concentration)

2. Oxygen (in the air)

3. Source of ignition (e.g. electrical spark)

Primary and secondary explosion protection

The principle of integrated explosion protection requires allexplosion protection measures to be carried out in a defined order.A distinction is made here between primary and secondary protective measures.

Primary explosion protection covers all measures that prevent the formation of a potentially explosive atmosphere.

What protective measures can be taken to ensure that the risk of an explosion will be minimized?

■ Avoidance of combustible substances

■ Inerting (addition of nitrogen, carbon dioxide, etc.)

■ Limiting of the concentration

■ Improved ventilation

Secondary explosion protection is required if the explosion hazard cannot be removed or can only be partially removed using primary explosion protection measures.

Physical fundamentals and parameters 5

Air concentration100 Vol.%

100 Vol.%

0 Vol.%

0 Vol.% Concentration of combustible substance

Mixture too lean:No combustion

Mixture too rich:Partial deflagrationNo explosion

Explosion limit

GArea subject to explosion

The consideration of technical safety parameters is necessary for the characterization of potential dangers:

Flash point

The flash point for flammable liquids specifies the lowesttemperature at which a vapor-air mixture forms over thesurface of the liquid that can be ignited by a separate source.

If the flash point of such a flammable liquid is significantly above the maximum occurring temperatures, a potentiallyexplosive atmosphere cannot form there. However, the flash point of a mixture of different liquids can also be lower than the flash point of the individual components.

In technical regulations, flammable liquids are divided into four hazard classes:

Explosion limits

Combustible substances form a potentially explosiveatmosphere when they are present within a certain range of concentration.

If the concentration is too low (lean mixture) and if theconcentration is too high (rich mixture) an explosion does not take place. Instead slow burning takes place, or no burning at all.

Only in the area between the upper and the lower explosion limit does the mixture react explosively if ignited.

The explosion limits depend on the surrounding pressure and the proportion of oxygen in the air (see the table below).

We refer to a deflagration, explosion, or detonation, depen-ding on the speed of combustion.

A potentially explosive atmosphere is present if ignition repre-sents a hazard for personnel or materials.

A potentially explosive atmosphere, even one of low volume, can result in hazardous explosions in an enclosed space.

Explosion limits of combustible substances

Hazard class Flash point

AI < 21 °C

AII 21 °C to 55 °C

AIII > 55 °C to 100 °C

B < 21 °C, soluble in water at 15 °C

Substance designation

Lower explosion limit [Vol. %]

Upper explosion limit [Vol. %]

Acetylene 2.3 78.0(self-decomposing)

Ethylene 2.3 32.4

Petrol ~ 0.6 ~ 8

Benzene 1.2 8

Natural gas 4.0 (7.0) 13.0 (17.0)

Heating oil/diesel ~ 0.6 ~ 6.5

Methane 4.4 16.5

Propane 1.7 10.9

Carbon bisulfide 0.6 60.0

City gas 4.0 (6.0) 30.0 (40.0)

Hydrogen 4.0 77.0

6 Physical fundamentals and parameters

Physical fundamentals and parameters

Dust

In industrial environments, e.g. in chemical factories or corn mills, solids are frequently encountered in fine form – e.g. as dust.

Dust is defined in EN 50281-1-21) as "small solid particles in the atmosphere which are deposited because of their own weight, but which still remain in the atmosphere for a period of time as a dust/air mixture". Deposits of dust are comparable with a porous body, and have a hollow space of up to 90 %. If the temperature of dust deposits is increased, the result may be spontaneous ignition of the combustible dust.

If dust deposits with a small grain size are whirled up, there is a danger of explosion. This increases as the size is reduced, since the surface area of the hollow space becomes larger. Dust explosions are frequently the result of whirled up glo-wing layers of dust which possess the basis for ignition. Explo-sions of gas or vapor mixtures with air can whirl up dust where the gas explosion then merges into a dust explosion. In collie-ries, explosions of methane gas frequently lead to explosions of coal dust whose effect was often greater than that of the gas explosion.

1) Parallel to DIN 50281 there is already EN 61241-1.

The danger of an explosion is prevented by using explosion-proof devices according to their suitability. The identification of the device category reflects the efficiency of explosion pro-tection, and thus the application in corresponding hazardous areas. The danger of explosive dust atmospheres and theselection of appropriate protective measures are assessed using safety parameters for the involved substances. Dusts are considered according to two substance-specific properties:

■ ConductivityDusts are referred to as conductive if they have a specific electric resistance up to 103 Ohmmeter.

■ CombustibilityCombustible dusts can burn or glow in air, and form explo-sive mixtures with air at atmospheric pressure and attemperatures from – 20 °C to + 60 °C.

Safety parameters for whirled-up dusts are, for example, the minimum ignition energy and the ignition temperature,whereas for deposited dusts, the glow temperature is acharacteristic property.

Physical fundamentals and parameters 7

Minimum ignition energy

The application of a certain amount of energy is required toignite a potentially explosive atmosphere.

The minimum energy is taken to be the lowest possibleconverted energy, for example, the discharge of a capacitor, that will ignite the relevant flammable mixture.

The minimum energy lies between approximately 10-5 J for hydrogen, and several Joules for certain dusts.

What can cause ignition?

■ Hot surfaces

■ Adiabatic compression

■ Ultrasound

■ Ionized radiation

■ Open flames

■ Chemical reaction

■ Optical radiation

■ Electromagnetic radiation

■ Electrostatic discharge

■ Sparks caused mechanically by friction or impact

■ Electrical sparks and arcs

Welding sparks,sheaf of

impact sparks in mills

Sheaf of grinding sparks

electrostaticdischarges,

impact sparks

rare

rarerare

Gases Dusts Practice-orientedignition source

Minimum ignition energy(mJ)

1000

100

10

1

0.1

0.01

8 Classification of explosion-proof equipment

Classification of explosion-proof equipment

Identification

The identification of electrical equipment for hazardous areas should permit recognition of:

■ The vendor of the equipment

■ A designation by which it can be identified

■ The area of use

- Below ground I

- Other areas II

■ Gases and vapors - G -, dusts - D - or mines - M -,

■ The categories which indicate whether the device can be used for particular zones,

■ The type(s) of protection with which the equipmentcomplies,

■ The testing agency which provided the test certificate, the standard (or its release version) with which the equipment complies – including the testing agency’s registrationnumber of the certificate and, if necessary, any specialconditions which have to be observed.

■ In addition, the data should be provided which are usually required for such a device of industrial design.

Example of identification according to directive 94/9/EC

Example of a device identification

Example Meaning

> 0032 II 2D IP65 T 80°C

Temperature range

Housing protection class

Ex protection zone

Named agency for certification of the QA system according to directive 94/9/EC

Conformity symbol

Example Meaning

EXAMPLE COMPANY type 07-5103-.../... Identification of vendor and type

Ex II 2D IP65 T 80°CManufactured according to EN 61241-.-. Protected by enclosure, IP65 degree of protectionMax. surface temperature + 80 °C

IBExU 00 ATEX 1081 Consecutive number of testing agency

ATEX generation

Year of test

Symbol of testing agency

Classification of explosion-proof equipment 9

Device groups/categories

Devices are classified into device groups:

■ Device group I

- in underground operations

- in mines as well as open-cast operations

- and their surface installations

■ Device group II

- Devices for use in the other areas

Each device group contains equipment that is in turn assigned to different categories (Directive 94/9/EC). The category speci-fies the zone in which the equipment may be used.

Zones

Areas subject to explosion hazard are divided into zones. Divi-sion into zones depends on the chronological and geographi-cal probability of the presence of a hazardous, potentiallyexplosive atmosphere.

Information and specifications for zone subdivision can be found in EN/IEC 60079-10.

Connection between device group, device category and zone

Many low-voltage controlgear and switching devices, e.g. overload relays and motor starter protectors are intended for switching and controlling equipment in explosive atmo-spheres while being positioned outside.

These devices are labeled with the category of the equipment to be protected. The category, however, is written in round brackets, e.g.: Ex II (2) GD

Device group Device category Zone

IMiningMine gas and/or flammable dusts

M = MiningM 1M 2

----

IIOther areas Potentially explosive atmosphere

G = Gas1 G2 G3 G

0, 1, 21, 22

D = Dust 1 D2 D3 D

20, 21, 2221, 2222

Explanation of the device categories:

M 1, 1 G, 1 D

Extremely high level of safety = device safety must be guaranteed even in the case of rare device faults, e.g. simultaneous fault in two devices.

M 2, 2 G, 2 D

High level of safety = device safety must be guaranteed in the case of frequent device faults,e.g. fault in one device.

3 G,3 D

Normal level of safety = device safety must be guaranteed in the case of fault-free operation.

Explanation of the zones:

0, 20 It is to be expected that a hazardous, potentially explosive atmosphere will occur continuously, often and over extended periods.

1, 21 It is to be expected that a hazardous, potentially explosive atmosphere will only occur occasionally.

2, 22 It is to be expected that a hazardous, potentially explosive atmosphere will occur only rarely and then only for a short period.


Classification of explosion-protected equipment

Types of protection

The protection types are design measures and electrical measures carried out on the equipment to achieve explosion protection in the areas subject to explosion hazard.

Protection types are secondary explosion protection measu-res. The scope of the secondary explosion protection measu-res depends on the probability of the occurrence of a hazar-dous, potentially explosive atmosphere.

Electrical equipment for areas subject to explosion hazard must comply with the general requirements of EN 60079-0 and the specific requirements for the relevant type of protec-tion in which the equipment is listed. However, the type of protection "Protection by housing" does not refer toEN 60079-0, but to EN 61241-0.

The types of protection listed on the following pages are signi-ficant in accordance with EN 60079-0. All types of protection are based on different protection concepts.

Gases – Types of protection Application in zone

Type of protection

L = Label Schematicrepresentation

Basic principle Standard Examples 0 1 2

Generalrequire-ments

General requirements for the type andtesting of electrical equipment intended for the Ex area.

EN 60079-0

Increased safety

e Applies only to equipment, or its compo-nent parts, that normally does not create sparks or arcs, does not attain hazardous temperatures, and whose mains voltage does not exceed 1 kV.

EN 60079-7IEC 60079-7FM 3600UL 2279 REPG

Terminals,connectionboxes ■ ■

Flame-proofenclosure

d If an explosion occurs inside the enclosure, the housing will withstand the pressure and the explosion will not be propagated outside the enclosure.

EN 60079-1IEC 60079-1FM 3600UL 2279 REPG

Switchgear,transformers

■ ■

Pressur-izedenclosure

p The ignition source is surrounded by apressurized (minimum 0.5 mbar) protective gas – the surrounding atmosphere cannot enter.

EN 60079-2IEC 60079-2FM 3620NFPA 496

Control cabinets,switching cabinets ■ ■

Intrinsic safety

i By limiting the energy in the circuit, the for-mation of impermissibly high temperatures sparks, or arcs is prevented.

EN 50020IEC 60079-11FM 3610UL 2279 REPG

Actuators,sensors,PROFIBUS DPRS 485-iS

■ ■ ■

Oilimmersion

o Equipment or equipment parts are im-mersed in oil and thus separated from the Ex atmosphere.

EN 50015IEC 60079-6FM 3600UL 2279 REPG

Transformers,switchgear

■ ■

Sandfilling

q Ignition source is buried in sand. The Exatmosphere surrounding the housing can-not be ignited by an arc.

EN 50017IEC 60079-5FM 3600UL 2279 REPG

Heater strips,capacitors

■ ■

Molding m By embedding the ignition source in amolding, it cannot ignite the Ex atmo-sphere.

EN 60079-18IEC 60079-18FM 3600UL 2279 REPG

Sensors,switchgear

■ ■

Protection types

n Zone 2:This protection type comprises several types of protection

Slightly simplified application of the other Zone-2 protection types – "n" stands for "non-igniting".

EN 60079-15IEC 60079-15

Programmable controllers ■ ■

Classification of explosion-proof equipment 11

Explosion groups

In the explosion groups, a distinction is first made between equipment of Group I and of Group II:

Electrical equipment of Group I is used for mines subject to fire-damp.

A further division into explosion groups is made for the electri-cal equipment of Group II. The division depends on the spark ignition capability through a gap of defined width and length (according to EN 60079-14).

Electrical equipment with approval for explosion group IIC may also be used in explosion groups IIA and IIB.

Determination of explosion group

A gas is present both inside and outside a flame-proofenclosure. The gas inside the explosion chamber is ignited.

Result: If an ignition inside the explosion chamber is not transferred through the gap of defined width to the outside, the explosion group has been determined.

1) Parallel to DIN 50281 there is already EN 61241-1.2) The gap width limit is the width between two 25-mm long,

parallel flange surfaces of an explosion chamber.

Dusts – Types of protection Application in zone

Type ofprotection

Label Basic principle Standard Examples 20 21 22

Pressurized enclosure

pD The penetration of a surrounding atmosphere into the en-closure of electrical equipment is prevented in that a pro-tective gas (air, inert gas or other suitable gas) is kept within the enclosure at a pressure higher than the surroundingatmosphere.

EN 502811)

IEC 61241Equipment where sparks, arcs or hot components occur in normal operation

■ ■ ■

Molding mD Parts which could ignite an explosive atmosphere through sparks or warming-up are potted in a casting compound such that the explosive atmosphere cannot ignite. This is achieved by surrounding the components on all sides by a casting compound which is resistant to physical (in particu-lar electrical, thermal and mechanical) and chemical influ-ences.

EN 502811)

IEC 61241Large machines,slipring or collector motors, switchgear and control cabinets ■ ■ ■

Protection by enclosure

tD The enclosure is sealed so tight that no combustible dust can penetrate into it. The surface temperature of the exter-nal enclosure is limited.

EN 502811)

IEC 61241Measuring andmonitoring systems ■ ■ ■

Intrinsicsafety

iaD, ibD Current and voltage are limited such that intrinsic safety is guaranteed. No sparks or thermal effects can ignite a dust/air mixture.

EN 502811)

IEC 61241Sensors and actuators ■ ■ ■

Explosion group Use

Group I Electrical equipment for mines subject to fire-damp==> fire-damp protection EEx...I

Group II Electrical equipment for all other areas subject to explosion hazard==> explosion protection EEx...II

Explosion group

Gap width limits for flameproof enclosure2)

Degree of hazard

Equipment requirements

IIA > 0.9 mm

IIB 0.5 mm to 0.9 mm

IIC < 0.5 mm

Explosion chamber

Gapwidth1)

Potentially explosiveatmosphere

Gap length

low low

high high


Classification of explosion-protected equipment

Temperature classes

The ignition temperature of flammable gases or a flammable liquid is the lowest temperature of a heated surface at which the gas/air or vapor/air mixture ignites.

Thus the highest surface temperature of any equipment must always be less than the ignition temperature of the surroun-ding atmosphere.

Temperature classes T1 to T6 have been introduced for electri-cal equipment of Explosion Group II. Equipment is assigned to each temperature class according to its maximum surface temperature.

Equipment that corresponds to a higher temperature class can also be used for applications with a lower temperature class.

Flammable gases and vapors are assigned to the relevant tem-perature class according to ignition temperature.

Classification of gases and vapors into explosion groups and temperature classes

Temperature class

Maximum upper surface tempera-ture of theequipment

Ignition temperatures of combustiblesubstances

T1 450 °C > 450 °C

T2 300 °C > 300 °C

T3 200 °C > 200 °C

T4 135 °C > 135 °C

T5 100 °C > 100 °C

T6 85 °C > 85 °C

Explosion group

Temperature classes

T1 T2 T3 T4 T5 T6

I Methane

II A AcetoneEthaneEthylacetateAmmoniaBenzene (pure)Ethanoic acidCarbon monoxideCarbon oxideMethaneMethanolPropaneToluol

Ethyl alcoholi-amyl acetaten-butanen-butylalcohol

PetrolDiesel fuelAircraft fuelHeating oilsn-hexane

AcetylaldehydeEthylether

II B City gas (illuminating gas)

Ethylene

II C Hydrogen Acetylene Carbon bisulfide

Low-voltage controls and distribution for potentially explosive areas 13

Product range of Low-voltage controls and distributionfor potentially explosive areas

Systems

AS-Interface – consistent system, superior strategy

As a cost-effective and robust bus system at field level, AS-Interface connects – open and manufacturer-independent – actuators and sensors to control – for standard as well as safety applications. A serial field bus connects all automatization components easily, safely and consistently.The ATEX-certified K60 compact modules make the application of AS-Interface possible even in potentially explosive areas.

Type Series Certificate number Certification based on

Type ofprotection/Identification

Digital I/O modules IP67 – K60

3RK1 400-1DQ05-0AA3, 3RK1 200-0CQ05-0AA3

K60 ATEX 2705 EN 60947-5-2, EN 50281-1-1

Ex II (3) D X

You can find further information on this product in Catalog LV 1 and in Catalog Technical Information LV 1 T in chapter 2.

14 Low-voltage controls and distribution for potentially explosive areas


Protecting1)

SIRIUS motor starter protectors for motor protection

3RV motor starter protectors are compact, current limiting motor starter protectors. Theyguarantee safe disconnection in the event of a short circuit and protect consumers and plants from overload. Moreover, they are suitable for normal switching of loads with low switching frequency as well as for the safe disconnection of the plant from the mains during maintenance or changes. SIRIUS 3RV is the only universal product family on the market for motor starter pro-tectors up to 100 A.

Type Size Certificate number Certification based on


Motor starter protectors for motor protection

3RV10 11 S00 DMT 02 ATEX F 001, DMT 02 ATEX F 001 N1

IEC 60947-4-1, EN 60079-14

Ex II (2) GD

3RV10 21 S0

3RV10 31 S2

3RV10 41 S3

3RV10 42 S3


1) Information for the implementation of current monitoring motor protection devices. Definition of the locked-rotor time tE: if the rotor of an explosion-protected three-phase AC motor of protection type "Increased Safety" EEx e stalls (locks) at operating temperature during runtime, the motor must be switched off, at the very latest, when either the rotor or the stator winding have reached their ma-ximum temperature. The time that elapses until the rotor or stator winding has reached maximum temperature is called the locked-rotor time tE or tE time.The demands made on overload protective devices with regard to tE time: for tripping devices and relays with inverse time-delay operation, tripping characteri-stics must be available at the operating site. The characteristics should show the release time for 3-pole loading, assuming a cold state and a room temperature of 20 °C, depending on at least a 3 - 8-fold setting current. The protective devices must comply with the specified release times with a permissible deviation of ± 20 %. The tripping devices and relays for machines with cage rotors must be selected such that the release times for 3-pole loading do not exceed the locked-rotor time tE specified on the type plate.

For information on the tripping characteristics of our circuit-breakers and overload relays, visit our web site at:www.siemens.com/lowvoltage/manuals


Protecting1) (continued)

3RB20, 3RB21

3RU11

SIRIUS 3RB2 and 3RU1 overload relays

SIRIUS overload relays, which are available as solid-state (3RB2) and thermal (3RU1) versions, are designed for the inverse-time delayed protection from overload in the main circuit. This in-cludes all electrical loads – as well as all other relevant switching and protection devices in the respective load feeder. The overload relays are certified according to ATEX and thus suitable for motors with "increased safety" type of protection EEx e.



3RB solid-state overload relays

for standard applications 3RB20, 3RB21 S00 to S12

PTB 06 ATEX 3001 EN 60079-14, IEC 60947-4-1, IEC 61508

Ex II (2) GD

for High-Feature applications 3RB22, 3RB29 PTB 05 ATEX 3022

3RU1 thermal overload relays

for standard applications 3RU11 1 S00 DMT 98 ATEX G 001, DMT 98 ATEX G 001 N1

IEC 60079-14, EN 60079-14

Ex II (2) GD

3RU11 2 S0

3RU11 3 S2

3RU11 4 S3


1) Information for the implementation of current monitoring motor protection devices. Definition of the locked-rotor time tE: if the rotor of an explosion-protected three-phase AC motor of protection type "Increased Safety" EEx e stalls (locks) at operating temperature during runtime, the motor must be switched off, at the very latest, when either the rotor or the stator winding have reached their ma-ximum temperature. The time that elapses until the rotor or stator winding has reached maximum temperature is called the locked-rotor time tE or tE time.The demands made on overload protective devices with regard to tE time: for tripping devices and relays with inverse time-delay operation, tripping characteri-stics must be available at the operating site. The characteristics should show the release time for 3-pole loading, assuming a cold state and a room temperature of 20 °C, depending on at least a 3 - 8-fold setting current. The protective devices must comply with the specified release times with a permissible deviation of ± 20 %. The tripping devices and relays for machines with cage rotors must be selected such that the release times for 3-pole loading do not exceed the locked-rotor time tE specified on the type plate.




Starting

SIRIUS 3RW soft starters

Soft starters offer you a complete spectrum covering all standard and High-Featureapplications of motor starting. Thus the advantages of soft starting and smooth ramp-down for simple and economical realization of optimal machine concepts are available today for the most diverse applications.



Soft starters for standardapplications

3RW40 S6, S10/S12

BVS 05 ATEX F 002 EN 60079-14, IEC 60947-4-2,IEC 61508

Ex II (2) GD



Monitoring and control1)

SIMOCODE pro 3UF7 motor management system

The communication-capable, modularly designed SIMOCODE pro motor management system (SIRIUS Motor management and Control Devices) quickly and reliably protects motors of types of protection EEx e and EEx d in potentially explosive areas. SIMOCODE pro is certified accor-ding to the latest ATEX standards.The use of SIMOCODE pro also means that no time is lost because of periodically necessary function tests of feeders in the Ex area.


Type of protect./Identification

SIMOCODE promotor management andcontrol devices

3UF7 S00 to S12

BVS 06 ATEX F 001 EN 60079-14,IEC 60947-4-1,IEC 61508

Ex I (M2),Ex II (2) GD


SIRIUS 3RN1 thermistor motor protection relays for PTC sensors

3RN1 thermistor motor protection relays are advantageous wherever current-dependent pro-tection by means of motor starter protectors or overload relays are not the ideal means ofmonitoring. In certain situations an overheating can occur often due to external influences. This overheating cannot be detected by the thermal image in the motor starter protector/over-load relay. SIRIUS thermistor motor protection relays are certified for gases and dust according to ATEX.

Type Width Certificate number Certification based on

Type of protect./Identification

mm

Thermistor motor protection relays for PTC sensors (PTCs Type A)

3RN10 22.5; 45

PTB 01 ATEX 3218 EN 60079-14, IEC 60947-8

Ex II (2) G

3RN10 11-.B, 3RN10 11-.G, 3RN10 12-.B, 3RN10 12-.G, 3RN10 13-…0

Ex II (2) GD


1) Information for the implementation of current monitoring motor protection devices. Definition of the locked-rotor time tE: if the rotor of an explosion-protected three-phase AC motor of protection type "Increased Safety" EEx e stalls (locks) at operating temperature during runtime, the motor must be switched off, at the very latest, when either the rotor or the stator winding have reached their ma-ximum temperature. The time that elapses until the rotor or stator winding has reached maximum temperature is called the locked-rotor time tE or tE time.The demands made on overload protective devices with regard to tE time: for tripping devices and relays with inverse time-delay operation, tripping characte-ristics must be available at the operating site. The characteristics should show the release time for 3-pole loading, assuming a cold state and a room temperature of 20 °C, depending on at least a 3 - 8-fold setting current. The protective devices must comply with the specified release times with a permissible deviation of ± 20 %. The tripping devices and relays for machines with cage rotors must be selected such that the release times for 3-pole loading do not exceed the locked-rotor time tE specified on the type plate.




Detection

3SE2 position switches

Position switches are used wherever movable parts in plants and on machines have to bepositioned, controlled and monitored. Whether for monitoring protection equipment with hinges or for monitoring laterally movable protection equipment or for detecting dangerous movements of machine parts – our devices can meet practically all industrial requirements.

Type Width Certificate number

Certification based on


mm

Position switches 3SE2 100-.....-0AE0 56 ATEX 2603a EN 50281-1, EN 50014

Ex II 3D

3SE2 120-.....-0AE0 40



Visit us on the Internet: www.siemens.com/lowvoltage/atex

Test certificates can be found underwww.siemens.com/automation/support

Commanding and signaling

3SB3 commanding and signaling devices

Commanding and signaling devices make sure that the conditions of machines and plants (e.g. sources of error or disturbances) are being signaled in time and reliably and that machines and plants are being controlled and brought to a safe condition in case of an emergency. Part of our extensive product range are actuators and switch blocks as well as lampholders with LED which are called simple electrical apparatus in compliance with ATEX directive 94/9/EG thus being suitable for application in intrinsic circuits.

Type Version Certificate number

Certification based on

Type ofprotection

Actuating elements

Actuator 3SB30 ..3SB35 ..

Plastic or metalactuator

ATEX 2690b Simple electri-cal apparatus in compliance with EN 50020,IEC 60947-5-1

Application only in circuits of type ofprotection i (Intrinsic safety)acc. to EN 50020

Contact block 3SB34 .. Spring-loadedterminals or screw connection

Components for actuating elements

Lampholder 3SB34 ..-1A Spring-loadedterminals or screw connection

ATEX 2689b Simple electri-cal apparatus in compliance with EN 50020,IEC 60947-5-1

Application only in circuits of type ofprotection i (Intrinsic safety)acc. to EN 50020Application up to a voltage of 26,4 V (LEDs)

LED 3SB39 01-1.A Rated voltage 24 V AC/DC,BA 9s base


00_atex_U1_U4_200606_en.FH10 Tue Jul 11 13:27:40 2006 Seite 2

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· PDF file4 Physical fundamentals and parameters 3 1 2 Integrated explosion protection Prevent the formation of potentially explosive atmospheres Prevent the ignition