Bulletin 1694 Modular Electronic Circuit Protectors

The next generation Bulletin 1694 Modular Electronic Circuit Protection products are designed to provide an excellent solution to the challenges of protecting 24V DC control circuits.

Because of the characteristics of the switch mode power supplies that energize these systems, there are unique challenges to using thermomagnetic circuit breakers. Since the power supply is constrained as to its capacity to provide current, overloads can result in voltage drops and overcurrent conditions that don’t trip a traditional circuit breaker before equipment is damaged or wiring overheats.

There are two situations where the limitations of traditional thermomagnetic circuit protection are more likely to occur:

1) A condition where the circuit is experiencing an overload ofbetween 100 and 130 percent of the circuit breaker’s currentIn this situation, it often takes an extended amount of time before thebreaker trips. Meanwhile, wiring can overheat and equipment can bedamaged due to overcurrent.

2) When the circuit is shorted at power-up Thermal-magnetic circuitbreakers are effective at tripping when a circuit is shorted while underpower. However, if the short is present before power is applied, it cantake several minutes for the circuit breaker to trip – again because ofthe limitation of the power supplied to supply current.

To learn more about electronic circuit protection and compare the actual trip times of 1694 electronic circuit protection with equivalent thermo-magnetic circuit breakers under a variety of conditions, see our online demonstration at ab.rockwellautomation.com/ Circuit-and-Load-Protection/ 1694-Electronic-Circuit-Protection-Module

Another limitation of thermal-magnetic circuit breakers occurs with capacitive or inductive loads. In these cases, normal current inrush can cause nuisance tripping when these devices are energized.

The Bulletin 1694 Electronic Circuit Protection system solves these problems. It has a tripping threshold of 105 percent of the rated current, at which point it trips in three seconds. A traditional circuit breaker can take well over ten minutes to trip at up to 120 percent overload.

This is a modular system, which enables you to configure protection to match your application needs.

Power feed modules

• Take power in (up to 40 A) from the24V DC power supply and distributeit to attached protection modules

• Left-feed (standard) / center- andright-feed option

Protection modules

• One channel or two channelsin the same compact(12.5 mm width) housing

• Current rating from 1 A…10 Afix current

• Available in Class 2 (1 A…4 A)

Distribution modules

• Plus and GND distribution forconnecting multiple loadsper channel

1694 Modular Electronic Circuit Protection Features

Protection models are fed from power module and attached by attaching with built-in levers.

Optional AUX contact for signaling

any of the attached

modules has tripped

Input feed from power

supply, up to 40 A

Multicolor LED OptionsGreen LED Indicator

• Loads are connected

Not Illuminated LED Indicator

• Manually switched offby built-in micro switch(built-in in LED)

• Individual load on 1 Achannel is disconnected

Green / Amber Blinking LED Indicator

• 90% load warning ofnominal current is reached.In case given INominal = 1 A

• Load is still connected—this is a warning

Red LED Indicator

• Device has tripped due tooverload or short circuit

• Individual load at 1 A channelis disconnected

• Tripping on one channeldoes not affect remainingloads in assembly

Push-in Terminalsfor time-saving wiring

1694-PF Power Feed Modules

a

Module Type

Code Description

PF Power Feed Module Standard

PFA Power Feed Module Standard with AUX Contact

d

Max Current

Code Description

4 40 A

4C(1) Line Connected

4S(1) Line Separated

b

Mounting Position

Code Description

1 Left

2 Middle

3 Middle or Right

c

Function

Code Description

24 Line (24V DC input)

L Line

G GND

1694 – PFA 1 24 4

a b c d

1694-PM Protection Modules

a

Module Voltage

Code Description

PM Protection Module

d

Rating

Code Description

Blank No Options

CL2(1) Class 2

b

Number of Channels

Code Description

1 1 Channel

2 2 Channels

c

Output Current Rating

Code Description

1 1 A

2 2 A

3 3 A

4 4 A

6 6 A

8 8 A

10 10 A

11 1 A, 1 A

22 2 A, 2 A

33 3 A, 3 A

44 4 A, 4 A

66 6 A, 6 A

1694 – PM 1 4 CL2

a b c d

(1) Class 2 (100V A) = 1 A…4 A

(1) With line option only.

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Publication 1694-PP001A-EN-P – February 2020 Copyright © 2020 Rockwell Automation, Inc. All Rights Reserved. Printed in USA.

Expanding human possibilitiy and Rockwell Automation are trademarks of Rockwell Automation, Inc. Trademarks not belonging to Rockwell Automation are property of their respective companies.

1694-DM Distribution Modules

a

Module Type

Code Description

DM Distribution Module

d

Max Current

Code Description

2 20 A

b

Terminal Designator

Code Description

1 10 Terminals (1 x Line entry / 9 x Load +)

2 10 Terminals (2 x Line entry / 4 x Load + each)

3 10 Terminals GND

c

Function

Code Description

L Line

G GND

1694 – DM 1 L 2

a b c d