Terminal Markings for Contactors and Relays

Terminal markings for IEC contactors and relays

Siemens Industry, Inc.

www.usa.siemens.com/controls

Terminal markings June, 2010

Have you have ever been puzzled about IEC terminal markings for contactors and relays and the identifi cation codes listed in the catalog? What does EN50005 or EN50012 really mean? And whatabout the Identifi cation numbers spelled out in the product catalog? Did you know that certain auxiliary blocks can only be matched with contactors having an integrated NO or NC contact. This white paper will explain it all in detail for the Siemens line of SIRIUS IEC Contactors and Control Relays.

A white paper issued by Siemens. ©2010 Siemens Industry, Inc. All rights reserved.

Terminal markings for Contactors frame sizes S00to S12In contactors of frame size S00 with an integratedauxiliary contact, the terminal marking complies withEN 50 012. This also applies to contactors that areavailable as complete devices, frame sizes:• S0 to S3 with mounted auxiliary contact blocks 2 NO + 2 NC• S6 to S12 with side mounted auxiliary contact blocks 2 NO + 2 NC

Expanding the contactors of frame size S00All the contactors of frame size S00 (3 and 4-pole) canbe expanded with auxiliary switch blocks with theidentifi cation numbers 40 to 02 in acc. with EN 50005as follows:• Frame size S00 with an integrated auxiliary contact (identifi cation number 10E or 01) for contactors with 3 or 5 auxiliary contacts• Frame size S00 with 4 main contacts for contactors with 2 or 4 auxiliary contacts

NoteThe identifi cation numbers on the auxiliary switchblocks only apply to the attached auxiliary switches.

Expanding the contactors with 1 integrated NOcontact, S00 (3RT101.-...01)Contactors with one NO contact as an auxiliarycontact with screw-type or Cage Clamp terminals,identifi cation number 10E, can be expanded withauxiliary switch blocks with terminal markings inacc. with EN 50 012 for contactors with 2, 4, and 5 auxiliary contacts. The terminal markings ofthe complete contactors comply with EN 50 012.The identifi cation numbers 11E, 22E, 23E, and32E on the auxiliary switch blocks apply to thecomplete contactors.

ImportantAuxiliary switch blocks in acc. with EN 50 012 canonly be combined with contactors of frame size S00that have 1 NO contact in the basic unit because theyare coded. These auxiliary switch blocks cannot becombined with contactors that have an NC contact in the basic unit (identifi cation number 01).

Auxiliary contacts S00The following graphic shows you the auxiliary contacts that can be used to expand the contactors of frame size S00 (terminal marking in acc. with EN 50 012 or EN 50 005):

Fig. 3-42: Auxiliary contacts, contactors for switchingmotors (frame size S00)

Contactors, EN 50 0121 auxiliary contact

identifi cation no. 10E identifi cation no. 01

Auxiliary switchblocks, EN 50 0124, 3 or 1 contacts

identifi cation no. identifi cation no. 32E, 23E, 22E, 11E 40, 31, 22, 20, 11, 02

Auxiliary switchblocks, EN 50 0054 or 2 contacts

ContactorsEN 50 0125, 4 or 2 auxiliary contacts

identifi cation no. identifi cation no. 32E, 23E, 22E, 11E 40, 31, 22, 20, 11, 02

ContactorsEN 50 0055 or 3auxiliary contacts

White Paper Terminal Markings June, 2010 2


Expanding the contactors of frame sizes S0 to S12With contactors of frame sizes S0 to S3, you can alsoattach 1-pole auxiliary switch blocks instead of 4-poleauxiliary switch blocks. The terminal markings of the1-pole auxiliary switch blocks consist of sequencenumbers (location ID) on the basic unit and functionnumbers on the auxiliary switch blocks.

Auxiliary contacts S0 to S12The graphic (Fig. 3-43) below shows you the frontmount auxiliary contacts that can be used to expandthe contactors of frame sizes S0 to S3 (terminalmarking in acc. with EN 50 005 or EN 50 012):

Terminal markings of the contactors and controlrelays combined with auxiliary switch blocks

Terminal markings in acc. with EN 50 005The terminal markings for contactors are defi ned inEN 50 005 that contains general directives. Thefollowing summarizes the basic rules that apply toswitching elements of auxiliary circuits:

• The terminals of auxiliary contact elements are designated by two-digit numbers.• The digit in the unit place is a function number (NC contact: 1 and 2, NO contact: 3 and 4).• The digit in the tens place is a sequence number (all the switching elements of the same function must have different sequence numbers).

Identifi cation numbers EN 50 005The identifi cation numbers mean:Switching devices with a fi xed number of auxiliarycontact elements (NO contacts or NC contacts) can be assigned a two-digit identifi cation number. The fi rst digit represents the number of NO contacts and the second one the number of NC contacts. There is no information on the sequence of NO contacts and NC contacts in the contactor/control relay.

NoteThe identifi cation numbers on the auxiliary switchblocks only apply to the attached auxiliary switches.

Fig. 3-43: Auxiliary contacts for contactors for the switching of motors (frame sizes S0 to S12)

4-pole auxiliary contact blocks 1-pole auxiliary contact blocks

Contactors3RT10 2.3RT10 3.3RT10 4.withoutauxiliary contact

Auxiliary switch blocks, with 4 contacts 3RH1921-,HA.in acc. with EN 50 012

Contactor arrangementswith a 4-pole auxiliary switchblock, terminal markingsin acc. with EN 50 005

Contactor arrangementswith a 4-pole auxiliary switchblock, terminal markingsin acc. with EN 50 012

Auxiliary switch blocks,with 1 contact

Contactors3RT10 2.3RT10 3.3RT10 4.withoutauxiliary contact

Possible contactorarrangements with 1-pole auxiliary switch blocks, terminal markings in acc. with EN 50 005 or EN 50 012

identifi cation numbers:01, 1011,21, 1231, 22, 1302, 2003, 3004, 40

Auxiliary switch blocks,with 4 contacts 3RH1921-,FA.in acc. with EN 50 005

identifi cation no. 40, 31, 22, 04, 22U

identifi cation no. 31, 22, 13 1 NO 1 NC

identifi cation no. 40, 31, 22,02 identifi cation no. 31, 22, 13



EN 50 012/ EN 50 011For certain equipment such as auxiliary contactelements of contactors and control relays, the EN 50012 and EN 50 011 standards also apply. The EN 50012 defi nes the terminal markings and identifi cationnumbers for auxiliary contact elements of particularcontactors.

The terminal markings of the auxiliary contactelements match the terminal markings of corresponding

control relays with the ID letter E (in acc. withEN 50 011). For auxiliary contact elements ofcontactors with the same identifi cation number, theterminal marking must correspond to the sequencedefi ned in the standard.

Graphical symbols for auxiliary contact elementsBelow are some examples of graphical symbols forauxiliary contact elements of contactors that complywith EN 50 012:

Fig. 3-44: Graphical symbols for auxiliary contact elements in acc. with EN 50 012 (excerpt)



Device circuit diagramsThe following device circuit diagrams of the auxiliary switch blocks for contactors that switch motors containthe terminal markings in acc. with EN 50 012:

Internal circuit diagrams for 3RT1 contactors and accessories (valid for screw and cage clamp terminals)

U

U

Size S00Terminal designations according to EN 500123RT10 1 contactors

1 NOIdent. No. 10E

1 NC01

Size S0 to S12Terminal designations according to EN 500123RT10 2, 3RT10 3 contactors 3RT10 5 to 3RT10 7, 3RT12, 3RT14 contactors

3RT10 1 contactors (with 1 NO) 3RT10 2 and 3RT10 3, 3RT14 contactorswith front-mounted 3RH19 11-.H... auxiliary switch blocks with front-mounted 4-pole 3RH19 21- . HA22 auxiliary switch block1 NO + 1 NC 2 NO + 2 NCIdent. No.: 11E Ident. No.: 22E

Contactors 3RT1. 5, 3RT1. 6, 3RT1. 7 (sizes S6, S10, S12)with front-mounted 4-pole 3RH19 21- . HA22 auxiliary switch block or with lateral 2-pole 3RH19 21-1DA11 auxiliary switch blocks2 NO + 2 NC

2 NO + 2 NC 22E

2 NO + 3 NC Ident. No.: 23E

3 NO + 2 NC 32E

Size S0 to S3Terminal designations according to EN 500123RT10 . . - . X . 40-0LA2 contactorsVaristor built-in

Contactors with 4 main contacts, size S00Terminal designations according to EN 500053RT13 and 3RT15 contactors4 NO 2 NO + 2 NC

4-pole 3RH19 21- . HA. ./- .XA. . auxiliary switch blocks,for snapping onto the front1)

3 NO + 1 NCIdent. No.: 313RH19 21-:HA..

2 NO + 2 NC223RH19 21-:HA..

2 NO + 2 NC223RH19 21-:HA..

1 NO + 3 NC133RH19 21-:HA..

First laterally mountable 3RH19 21- . DA11, 3RH19 21-2DE11auxiliary switch block (solid-state compatible)1 NO + 1 NCLeft

1 NO + 1 NCRight

Second laterally mountable 3RH19 21- . JA11, 3RH19 21-2JE11auxiliary switch block (solid-state compatible)(only for sizes S3 to S12)1 NO + 1 NCLeft

1 NO + 1 NCRight

Contactors with 4 main contacts, sizes S0 to S3Terminal designations according to EN 500053RT13 and 3RT15 contactors4 NO 2 NO + 2 NC

(3RH19 21 auxiliary switch blocks acc. to EN 50005 can be snapped on)(3RH19 11 auxiliary switch blocks acc. to EN 50005 can be snapped on)

1) Not for 3RT12 vacuum contactors.




Accessories for size S00 contactors and contactor relaysTerminal designations according to EN 500053RT19 11-.F...auxiliary switch blocks and 3RH19 11-.FB..solid-state compatible auxiliary switch blocks (solid-state compatible auxiliary switch blocks)

2 NOIdent. No. 20

1 NO + 1 NC11

2 NC02

1 NO + 1 NC11 U

4 NOIdent. No. 40

3 NO + 1 NC31

2 NO + 2 NC22

2 NO + 2 NC22 U

2 NO + 2 NC11/11 U

with make-before-break 1 NO + 1 NC standard1 NO + 1 NC withmake-before-break

3RH19 11-1AA.. and 3RH19 11-1BA..auxiliary switch blocks,for snapping onto the front,cable entry from above or below

3RH19 11-1LA.. and 3RH19 11-1MA.. Internal wiring auxiliary switch blocks,for snapping onto the front,cable entry from above or below

1 NO 1 NC 2 NO 1 NO + 1 NC

Example of1 NO + 1 NC, cableentry from below

Accessories for size S0 to S12 contactorsTerminal designations according to EN 500053RH19 21- . F. . . auxiliary switch blocks, 4-pole,for snapping onto the front 1)

4 NOIdent. No. 40

3 NO + 1 NC31

2 NO + 2 NC22

4 NC04

3RH19 21-.CA. . auxiliary switch blocks, 1-pole,for snapping onto the front 1)

1 NO 1 NC

3RH19 21-1CD. . auxiliary switch blocks, 1-polewith make-before-break, for snapping onto the front 1)

1 NO 1 NC

(Terminal designations according to EN 50005 or EN 50012)1) Not for 3RT12 vacuum contactors.

2 NO + 2 NC22 U

with make-before-break

with make-before-break



3RH19 21-.FE22 solid-state compatible auxiliary switch block, 4-pole,for snapping onto the front 1)

2 NO + 2 NCIdent. No.: 22

3RH19 21-.EA. . fi rst laterally mountable auxiliary switch blocks (left)

2 NO 1 NO + 1 NC 2 NC

3RH19 21-.EA. . fi rst laterally mountable auxiliary switch blocks (right)2 NO 1 NO + 1 NC 2 NC

3RH19 21-.KA. . second laterally mountable auxiliary switch blocks (left)(only for sizes S3 to S12)2 NO 1 NO + 1 NC 2 NC

3RH19 21-.KA. . second laterally mountable auxiliary switch blocks (right)2 NO 1 NO + 1 NC 2 NC

1) Not for 3RT12 vacuum contactors.



Accessories for size S0 to S12 contactorsTerminal designations according to EN 500053RH19 21-1LA. . and 3RH19 21-1MA. . auxiliary switch block, 2-pole, Internal wiringfor snapping onto the front 1)

cable entry from above or below

2 NO 1 NO + 1 NC 2 NC

Example of1 NO + 1 NC,cable entryfrom below


1) Positively-driven operation is assured likewise for auxiliary switch blocks according to EN 50005 in conjunction with 3RH11 contactor relays (basic units).



Connection diagrams for 3RH1 contactor relays, size S00

Terminal designations according to EN 500111)

3RH11 contactor relays

4 NO 3 NO + 1 NC 2 NO + 2 NCIdent No.: 40E 31E 22E

3RH11 40 contactor relayswith 3RH19 11-1GA. .,3RH12 44, 3RH12 62 auxiliary switch blocks snapped onto the front

8 NO 7 NO + 1 NC 6 NO + 2 NCIdent. No.: 80E 71E 62E

5 NO + 3 NC 4 NO + 4 NC Ident. No.: 53E 44E

3RH14 latched contactor relays

4 NO 3 NO + 1 NC 2 NO + 2 NC Ident. No.: 40E 31E 22E

3RT1 contactors/3RH1 control relays

Auxiliary switches that can be attached to3RH1 control relaysThe 3RH1 control relays can be expanded by up to 4contacts using attachable auxiliary switch blocks. The auxiliary switch block has a centrally positioned release lever for disassembly.

Defi nition: EN 50 011The main standard for the designation of switchingelements for the control relays is EN 50 011, whichdefi nes the terminal markings, identifi cation numbers,and identifi cation letters of certain control relays usinga specifi c sequence of the switching elements. Thenumber, type, and position of the switching elementsmust be specifi ed using an identifi cation numberfollowed by an identifi cation letter.

In the case of 8-pole control relays, the letter “E”means that four NO contacts have to be arranged onthe lower (rear) contact level.

Auxiliary switch blocksThe contactor relays with 4 contacts according to EN 50 011, with the identifi cation number 40E, can be extended with 80E to 44E auxiliary switch blocks to obtain contactor relays with 8 contacts according to EN 50 011. The identifi cation numbers 80E to 44E on the auxiliary switch blocks apply to the complete contactors. These auxiliary switch blocks (3RH19 11–1GA ..) cannot be combined with contactor relays with identifi cation numbers 31E and 22E; they are coded.

All contactor relays with 4 contacts according to EN 50 011, identifi cation numbers 40E to 22E, can be extended with auxiliary switch blocks 40 to 02 to obtain contactor relays with 6 or 8 contacts in accordance with EN 50 005. The identifi cation numbers on the auxiliary switch blocks apply only to the attached auxiliary switch blocks.

In addition, fully mounted 3RH12 8-pole contactor relays are available; the mounted 4-pole auxiliary switch block in the 2nd tier is not removable.

The terminal designations comply with EN 50 011. These versions are built in accordance with Swiss regulations (SUVA) and are distinguished externally by a red labeling plate.

Expansion using auxiliary switch blocksThe following example of a control relay with 4 NOcontacts (contact designation in acc. with EN 50 011and EN 50 005) explains how auxiliary switch blocksare added on:

Fig. 3-46: Auxiliary contacts for control relays

Contactor relay, EN 50 0114 contacts

identifi cation no. 40E identifi cation no. 31E,

22E

Auxiliary switch blocks, Auxiliary switch blocks, EN 50 011, EN 50 011,4 contacts 4 or 2 contacts

identifi cation no. 80E, identifi cation no. 40, 71E, 62E, 53E, 44E 31, 22, 20, 11, 02

Contactor relay, Contactor relay, EN 50 011, EN 50 005,8 contacts 8 or 6 contacts

identifi cation no. 80E, 71E, 62E, 53E, 44E



Contact designationAuxiliary switch blocks – for example, 3RH1911-1GA22(2 NO + 2 NC contacts) in acc. with EN 50 011 canonly be attached to control relays with 4 NO contacts(3RH1140-.....) because they are coded. Theidentifi cation number (62E) printed on the auxiliaryswitch block (6 NO + 2 NC contacts) applies to thewhole contactor.

NO and NC contacts are in the same position on all thecontrol relays with the identifi cation number 62E (EN 50 011). This means contactors can be replaced without changing the wiring, which therefore makes

wiring very easy. You can attach auxiliary switch blocks that comply with EN 50 005 on all 3RH11 control relays and 3RT101 motor contactors. For example, the 3RH1911-1FA22 auxiliary switch block (2 NO + 2 NC contacts) has the identifi cation number 22, and this only applies to the attached auxiliary switch block.

Graphical symbols of the control relaysBelow are some examples of graphical symbols forcontrol relays with the identifi cation letter E thatcomply with EN 50 011:

Fig. 3-47: Graphical symbols for auxiliary contactors (control relays) in acc. with EN 50 011 (excerpt)

13 23 33 43

14 24 34 44

13 21 33 43

14 22 34 44

14 22 32 44

13 21 31 43

40 E

31 E

22 E

14 22 32 42

13 21 31 41

13 E

12 22 32 42

11 21 31 41

04 E

Coil Switching elementsIDno

13 23 33 43

14 24 34 44

13 23 33 43

14 24 34 44

14 24 34 44

13 23 33 43

80 E

71 E

62 E

14 24 34 44

13 23 33 43

53 E

14 24 34 44

13 23 33 43

44 E

Coil Switching elements

53 63 73 83

54 64 74 84

53 61 73 83

54 62 74 84

54 62 72 84

53 61 71 83

54 62 72 82

53 61 71 81

52 62 72 82

51 61 71 81

IDno.

4-pole control relays 8-pole control relays



Device circuit diagramsThe following device circuit diagrams of the control relays contain terminal markings in acc. with EN 50 011:

4 NO contacts Identifi cation number: 40 E

3 NO contacts + 1 NC contactIdentifi cation number: 31 E

2 NO contacts + 2 NC contactsIdentifi cation number: 22 E



13 23 33 43

44342414A2( )

A1(+) 13 21 33 43A1(+)

44342214A2( )

13 21 31 43

44322214A2( )

A1(+)

13 23 33 43A1(+) 53 63 73 83

44342414A2( ) 84746454

13 23 33 43A1(+) 53 61 73 83

44342414A2( ) 84746254

13 23 33 43A1(+) 53 61 71 83

44342414A2( ) 84726254

13 23 33 43A1(+) 53 61 71 81

44342414A2( ) 82726254

13 23 33 43A1(+) 51 61 71 81

44342414A2( ) 82726252

Fig. 3-48: Device circuit diagrams

8 NO contacts Identifi cation number: 80 E






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©2010 Siemens Industry, Inc.

White Paper Terminal Markings June, 2010

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Terminal Markings for Contactors and Relays