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 Dimensions External Length
RS Stock No. 445-0421
Mfr. Part No.1SAM201902R1001
BrandABB
$18.87
Each
units
2 NO/NC - Side Mount 2 A dc, 6 A ac 220 V dc, 400 V ac DP - - - - HK1 - -
RS Stock No. 209-6463
Mfr. Part No.M5735104
BrandMETCASE
$189.47
Each
units
- - - - - - - - - - - Mettec 350 x 250 x 85mm 350 mm
RS Stock No. 319-691
Mfr. Part No.K0 H010/A11-VE
$12.72
Each
units
2 NO/NC - - 25 A, 32 A - DP - - - - - - -
RS Stock No. 818-277
Mfr. Part No.NHI11-PKZ0
BrandEaton
$24.51
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. 209-5606
Mfr. Part No.M5716107
BrandMETCASE
$113.79
Each
units
- - - - - - - - - - - Mettec 160 x 130 x 85mm 160 mm
RS Stock No. 706-1888
Mfr. Part No.3RV2901-1A
BrandSiemens
$18.93
Each
units
2 NO/NC Sirius Innovation Plug In 2 A dc, 10 A ac 250 V dc, 690 V ac DP Screw -20°C +60°C -20 → +60 °C 3RV2 - -
RS Stock No. 791-2837
Mfr. Part No.A9A26927
$78.14
Each
units
2 NO/NC Acti 9 DIN Rail Mount 2 A dc, 6 A ac 24 → 130 V dc, 240 → 415 V ac DP Screw -35°C +70°C -35 → +70 °C iSD - -
RS Stock No. 394-9970
Mfr. Part No.LADN02
$58.33
Each
units
2 2NC - Front Mount - - DP Screw - - - LADN - -
RS Stock No. 759-055
Mfr. Part No.LA1KN22
$78.65
Each
units
4 2NO/2NC TeSys Clip On 10 A 600 V ac 4P Screw - - - LA1K - -
RS Stock No. 373-2249
Mfr. Part No.YM-130
$14.52
Each
units
- - - - - - - - - - - - - -
RS Stock No. 706-0850
Mfr. Part No.3RH2911-1AA01
BrandSiemens
$11.52
Each
units
1 NC Sirius Innovation Snap-On 6 A ac, 10 A dc 250 V dc, 690 V ac SPST Screw -25°C +60°C -25 → +60 °C 3RH2 - -
RS Stock No. 373-2283
Mfr. Part No.YM-250
$32.03
Each
units
- - - - - - - - - - - - - -
RS Stock No. 394-9885
Mfr. Part No.LADN31
$106.66
Each
units
4 3NO/NC TeSys Front Mount 10 A - 4P Screw -5°C +60°C - LADN - -
RS Stock No. 246-5061
Mfr. Part No.3RV1901-1A
BrandSiemens
$50.03
Each
units
2 NO/NC Sirius Classic Side Mount 2 A 24 V ac DP Screw - +60°C Maximum of +60 °C 3RV1 - -
RS Stock No. 394-9936
Mfr. Part No.LADN11
$60.35
Each
units
2 NO/NC TeSys Front Mount 10 A - DP Screw - - - LADN - -
RS Stock No. 746-0705
Mfr. Part No.3RH1921-1HA22
BrandSiemens
$101.24
Each
units
4 2NO/2NC Sirius Classic Snap Front - - 4P Screw - - - 3RH1 - -
RS Stock No. 395-0352
Mfr. Part No.GV2AF3
$6.44
Each
units
- - - - - - - - - - - GV2A - -
RS Stock No. 685-1523
Mfr. Part No.BFX1020
BrandLovato
$17.74
Each
units
2 2NO - Snap-On - - - Screw - - - - - -
RS Stock No. 257-3702
Mfr. Part No.VZ1
$24.15
Each
units
1 - - Side Mount 25 A 690 V ac SP Screw -20°C +50°C -20 → +50 °C VZ1 - -
RS Stock No. 413-1675
Mfr. Part No.GVAE203
$75.20
Each
units
2 2NO - Front Mount - 60 V dc, 240 V ac DP - - - - GVAE - -
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