Auxiliary Contacts

Contacts are the conductive pieces of material that form part of an electrically controlled switch. Auxiliary contacts form part of a contactor, which is a type of switch that can be controlled remotely.

Contactors are often used in very high-power circuits, and auxiliary contacts are the last phase of contact, used to reduce the power of the current. They have a lower current rating than regular power contacts, and can be used to de-energise the contactor.

How do auxiliary contacts work?

Auxiliary contacts are affixed to the main contacts and change state when the main contacts do. They pass the data from the circuit to a logic controller, which in turn gives instructions to the linked devices about whether to turn on or off.

Alternatively, they can be used as a standalone hardware control unit.

What are auxiliary contacts used for?

One common usage of auxiliary contacts is in push button controllers, where they can be built in to the start button.


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Description Price Number of Contacts Normal State Configuration Range Mounting Style Contact Current Rating Contact Voltage Rating Pole and Throw Configuration Terminal Type Minimum Operating Temperature Maximum Operating Temperature Operating Temperature Range Series Number of Timing Ranges External Dimensions
RS Stock No. 394-9908
Mfr. Part No.LADN22
MYR76.07
Each
units
4 2NO/2NC TeSys Front Mount 10 A 600 V ac 4P Screw -5°C +60°C - LADN - -
RS Stock No. 746-0705
Mfr. Part No.3RH1921-1HA22
BrandSiemens
MYR63.78
Each
units
4 2NO/2NC Sirius Classic Snap Front - - 4P Screw - - - 3RH1 - -
RS Stock No. 400-1445
Mfr. Part No.LADS2
MYR465.20
Each
units
2 NO/NC TeSys Front Mount 10 A 690 V - Screw -5°C +60°C -5 → +60 °C D - -
RS Stock No. 394-9936
Mfr. Part No.LADN11
MYR54.46
Each
units
2 NO/NC TeSys Front Mount 10 A - DP Screw - - - LADN - -
RS Stock No. 445-0415
Mfr. Part No.1SAM201901R1001
BrandABB
MYR59.62
Each
units
2 NO/NC - Front Mount 1 A dc, 3 A ac 220 V dc, 230 V ac DP - - - - HK1 - -
RS Stock No. 818-277
Mfr. Part No.NHI11-PKZ0
BrandEaton
MYR69.46
Each
units
2 NO/NC - Side Mount 2 A dc, 3.5 A ac 220 V dc, 500 V ac DPST Screw - - - - - -
RS Stock No. 735-2715
Mfr. Part No.3SB1400-0A
BrandSiemens
MYR51.56
Each
units
2 NO/NC - Front Mount 10 A 220 V dc, 400 V ac DPST Screw -25°C +70°C -25 → +70 °C - - -
RS Stock No. 314-286
Mfr. Part No.3TX4010-2A
BrandSiemens
MYR29.62
Each
units
1 NO - Plug In 6 A - SP - - - - 3TX4 - -
RS Stock No. 791-2824
Mfr. Part No.A9A26924
MYR117.53
Each
units
1 NO/NC Acti 9 DIN Rail Mount 2 A dc, 6 A ac 24 → 130 V dc, 240 → 415 V ac SPCO Screw -35°C +70°C -35 → +70 °C iOF - -
RS Stock No. 314-292
Mfr. Part No.3TX4001-2A
BrandSiemens
MYR28.75
Each
units
1 NC - Plug In 6 A - SP - - - - 3TX4 - -
RS Stock No. 395-0352
Mfr. Part No.GV2AF3
MYR23.11
Each
units
- - - - - - - - - - - GV2A - -
RS Stock No. 394-9879
Mfr. Part No.LADN40
MYR87.85
Each
units
4 4NO TeSys Front Mount 10 A - 4P Screw - - - LADN - -
RS Stock No. 521-4579
Mfr. Part No.5ST3010
BrandSiemens
MYR99.29
Each
units
2 NO/NC Sentron DIN Rail Mount 6 A 230 V ac DP Screw -5°C +40°C -5 → +40 °C 5ST3 - -
RS Stock No. 395-0138
Mfr. Part No.GVAE20
MYR47.61
Each
units
2 2NO - Front Mount - 60 V dc, 240 V ac DP Screw - - - GVAE - -
RS Stock No. 445-7983
Mfr. Part No.GHE3401321R0002
BrandABB
MYR99.73
Each
units
2 NO/NC - DIN Rail Mount - 220 V dc, 400 V ac DP Screw -25°C +55°C -25 → +55 °C ESB - -
RS Stock No. 333-546
Mfr. Part No.HI11-P1/P3-Z/SOND
BrandEaton
MYR61.39
Each
units
- NO/NC - - 10 A - - Screw - - - - - -
RS Stock No. 394-9914
Mfr. Part No.LADN20
MYR63.48
Each
units
2 2NO TeSys Front Mount 10 A - DP Screw - - - LADN - -
RS Stock No. 493-0652
Mfr. Part No.DILM32-XHI22
BrandEaton
MYR61.12
Each
units
4 2NO/2NC - Front Mount 4 A ac, 10 A dc 220 V dc, 500 V ac 4PST Screw - - - DILM - -
RS Stock No. 395-0100
Mfr. Part No.GVAN20
MYR52.98
Each
units
2 2NO - Side Mount - 240 V dc, 690 V ac DP Screw - - - GVAN - -
RS Stock No. 395-0122
Mfr. Part No.GVAN11
MYR48.61
Each
units
2 NO/NC TeSys Side Mount 6 A 240 V dc, 690 V ac DP Screw - - - GVAN - -
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