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 External Width External Dimensions
RS Stock No. 776-2963
Mfr. Part No.A9N26929
MYR422.98
Each
units
2 CO Acti 9 DIN Rail Mount 6 A ac, 6 A dc 130 V dc, 415 V ac DPDT Clamp -37°C +70°C -37 → +70 °C iC60 - -
RS Stock No. 122-0946
Mfr. Part No.BFCA-02
BrandWEG
MYR40.55
Each
units
2 2NC - Front Mount 10 A 690 V ac DPST Screw - - -25 → +55 °C BFCA - -
RS Stock No. 706-0908
Mfr. Part No.3RH2911-1HA03
BrandSiemens
MYR46.52
Each
units
3 3NC Sirius Innovation Snap-On 6 A dc, 10 A ac 250 V dc, 690 V ac 3PST Screw -25°C +60°C -25 → +60 °C - - -
RS Stock No. 806-7382
Mfr. Part No.A9A15096
MYR76.17
Each
units
1 1NC Acti 9 - 6 A 415 V ac SP - - - - iSW - -
RS Stock No. 400-1473
Mfr. Part No.LAD8N20
MYR77.44
Each
units
- 2NO - Side - - - Screw Clamp - - - LAD8 - -
RS Stock No. 125-1382
Mfr. Part No.A9C70114
MYR1,122.62
Each
units
- - Acti 9 - - - - - - - - iC60 - -
RS Stock No. 751-5714
Mfr. Part No.3RT1916-2FK21
BrandSiemens
MYR333.00
Each
units
2 NO/NC Sirius Classic DIN Rail Mount - - - Screw -25°C +60°C -25 → +60 °C 3RT1 - -
RS Stock No. 776-2957
Mfr. Part No.A9N26924
MYR218.17
Each
units
1 CO Acti 9 DIN Rail Mount 6 A ac, 6 A dc 130 V dc, 415 V ac SPDT Clamp -35°C +70°C -35 → +70 °C iC60 - -
RS Stock No. 776-2948
Mfr. Part No.A9N26923
MYR440.24
Each
units
- - Acti 9 - - - - - - - - iC60 - -
RS Stock No. 776-2954
Mfr. Part No.A9N26927
MYR219.35
Each
units
1 CO Acti 9 DIN Rail Mount 6 A ac, 6 A dc 130 V dc, 415 V ac SPDT Clamp -35°C +70°C -35 → +70 °C iC60 - -
RS Stock No. 373-2211
Mfr. Part No.YM-50
MYR27.19
Each
units
- - - - - - - - - - - YM 45 mm 50 x 45 x 30mm
RS Stock No. 706-1897
Mfr. Part No.3RV2901-1E
BrandSiemens
MYR70.12
Each
units
2 NO/NC Sirius Innovation Plug In 1 A dc, 2.5 A ac 60 V dc, 230 V ac DP Screw -20°C +60°C -20 → +60 °C 3RV2 - -
RS Stock No. 706-0917
Mfr. Part No.3RH2911-1HA13
BrandSiemens
MYR99.91
Each
units
4 NO/3NC Sirius Innovation Snap-On 6 A dc, 10 A ac 250 V dc, 690 V ac 4PST Screw -25°C +60°C -25 → +60 °C 3RH2 - -
RS Stock No. 395-0627
Mfr. Part No.GVAE1
MYR39.71
Each
units
2 NO/NC - Front Mount - 60 V dc, 240 V ac DP Screw - - - GVAE - -
RS Stock No. 493-0624
Mfr. Part No.277376 & DILM32-XHI11
BrandEaton
MYR39.56
Each
units
2 NO/NC - Front Mount 4 A ac, 10 A dc 220 V dc, 500 V ac DPST Screw -25°C +60°C -25 → +60 °C DILM - -
RS Stock No. 714-1795
Mfr. Part No.SSP25/RS
MYR35.60
Each
units
- - - Side Mount 25 A 690 V - Screw - - - - - -
RS Stock No. 711-6310
Mfr. Part No.1SBN010120R1011
BrandABB
MYR70.92
Each
units
2 NO/NC - Side Mount 6 A 600 V dc, 690 V ac DP Screw -40°C +70°C -40 → +70 °C CAL4-11 - -
RS Stock No. 395-0188
Mfr. Part No.GVAD0101
MYR91.34
Each
units
2 2NC - Side Mount - 240 V dc, 690 V ac DP Screw - - - GVAD - -
RS Stock No. 727-1549
Mfr. Part No.1SCA022353R4890
BrandABB
MYR46.70
Each
units
1 NC - Snap-On 6 A ac, 10 A dc 400 V dc, 690 V ac SP Screw - - - OA1G - -
RS Stock No. 326-734
Mfr. Part No.010288 & 22DILE
BrandEaton
MYR91.46
Each
units
4 2NO/2NC - Front Mount 2.5 A dc, 4 A ac 220 V dc, 500 V ac 4PST Screw - - - - - -