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. 486-889
Mfr. Part No.Z-HK
BrandEaton
$43.65
Each
units
2 NO/NC - - 3 A 230 V ac DP Screw - - - - - -
RS Stock No. 363-5772
Mfr. Part No.LA1KN133
$30.79
Each
units
4 NO/3NC - Clip On 10 A 600 V ac 4P Cage Clamp - - - LA1K - -
RS Stock No. 243-9905
Mfr. Part No.GAC0531
$71.46
Each
units
2 2NO - Clip On - - DP - - - - GAC0 - -
RS Stock No. 706-1901
Mfr. Part No.3RV2901-2A
BrandSiemens
$17.21
Each
units
2 NO/NC Sirius Innovation Plug In 2 A dc, 10 A ac 250 V dc, 690 V ac DP Cage Clamp -20°C +60°C -20 → +60 °C 3RV2 - -
RS Stock No. 711-6398
Mfr. Part No.CA4-31N
BrandABB
$35.82
Each
units
4 3NO/NC - Front Mount 6 A 600 V dc, 690 V ac 4P Screw -40°C +70°C -40 → +70 °C CA4 - -
RS Stock No. 122-9511
Mfr. Part No.3RV2901-1G
BrandSiemens
$54.58
Each
units
1 CO Sirius Innovation Plug In 300 mA 60 V @ 0.3 A SPDT-CO Screw -20°C +60°C -20 → +60 °C 3RV29 - -
RS Stock No. 493-0680
Mfr. Part No.DILA-XHI22
BrandEaton
$30.86
Each
units
4 2NO/2NC - Front Mount 4 A ac, 10 A dc 220 V dc, 500 V ac 4PST Screw - - - DILA - -
RS Stock No. 711-6323
Mfr. Part No.1SBN010110T1001
BrandABB
$10.02
Each
units
1 NC - Front Mount 6 A 600 V dc, 690 V ac SP Screw - - - CA4 - -
RS Stock No. 178-8009
Mfr. Part No.DILA-XHIC11
BrandEaton
$15.81
Each
units
2 NO/NC - Surface Mount 10 (DC) A, 4 (AC) A 220 V dc, 500 V ac 2P Spring Clamp -25°C +60°C -25 → +60 °C DILA - -
RS Stock No. 125-1383
Mfr. Part No.A9C70122
$407.03
Each
units
- - Acti 9 - - - - - - - - Ti24 - -
RS Stock No. 711-6376
Mfr. Part No.CA4-04M
BrandABB
$35.82
Each
units
4 4NC - Front Mount 6 A 600 V dc, 690 V ac 4P Screw - - - CA4 - -
RS Stock No. 609-4398
Mfr. Part No.VZN11
$20.55
Each
units
- - - Side Mount 16 A - - - - - - VZN1 - -
RS Stock No. 706-0891
Mfr. Part No.3RH2911-1FC22
BrandSiemens
$39.56
Each
units
4 2NO/2NC 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. 512-9500
Mfr. Part No.OA4B01
BrandABB
$27.68
Each
units
1 NC - Snap-On - - SP - - - - - - -
RS Stock No. 243-9898
Mfr. Part No.GAC0521
$72.25
Each
units
2 NO/NC - Clip On - - DP - - - - GAC0 - -
RS Stock No. 445-8021
Mfr. Part No.1SBN010010R1001
BrandABB
$8.86
Each
units
1 NC - Front Mount - - SP Screw - - - CA5 - -
RS Stock No. 706-0888
Mfr. Part No.3RH2911-1FB11
BrandSiemens
$29.60
Each
units
2 NO/NC Sirius Innovation Snap-On 6 A dc, 10 A ac 250 V dc, 690 V ac DPST Screw -25°C +60°C -25 → +60 °C 3RH2 - -
RS Stock No. 493-0674
Mfr. Part No.DILA-XHI31
BrandEaton
$24.39
Each
units
4 3NO/NC - Front Mount 4 A ac, 10 A dc 220 V dc, 500 V ac 4PST Screw - - - DILA - -
RS Stock No. 493-0668
Mfr. Part No.DILA-XHI11
BrandEaton
$17.35
Each
units
2 NO/NC - Front Mount 4 A ac, 10 A dc 220 V dc, 500 V ac DPST Screw - - - DILA - -
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