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. 124-3130
Mfr. Part No.5ST3022
BrandSiemens
TWD1,190.00
Each
units
- - Sentron - - - - - - - - 5ST3 - -
RS Stock No. 706-1917
Mfr. Part No.3RV2901-2E
BrandSiemens
TWD462.00
Each
units
2 NO/NC Sirius Innovation Plug In 1 A dc, 2.5 A ac 60 V dc, 230 V ac DP Cage Clamp -20°C +60°C -20 → +60 °C - - -
RS Stock No. 711-6335
Mfr. Part No.1SBN010111R1001 CC4-01
BrandABB
TWD597.00
Each
units
1 NC - Front Mount 6 A 600 V dc, 690 V ac SP Screw -40°C +70°C -40 → +70 °C CC4 - -
RS Stock No. 482-471
Mfr. Part No.DF14AM1
TWD366.00
Each
units
1 - - DIN Rail Mount 50 A - SP - - - - DF14 - -
RS Stock No. 512-9516
Mfr. Part No.OA3G01 1SCA022456R7410
BrandABB
TWD350.00
Each
units
1 NC - Snap-On - - SP - - - - - - -
RS Stock No. 901-0857
Mfr. Part No.11BGX1020
BrandLovato
TWD313.00
Each
units
2 2NO - DIN Rail Mount 10 A 690 V DPST Screw - - - BG - -
New
RS Stock No. 220-7508
Mfr. Part No.062031
BrandEaton
TWD444.00
Each
units
2 1NC/1NO Accessories Side Mounting 6 A 230 V - - - - - HI11 - -
RS Stock No. 512-9500
Mfr. Part No.OA4B01 1SCA022276R9210
BrandABB
TWD543.00
Each
units
1 NC - Snap-On - - SP - - - - - - -
RS Stock No. 445-8188
Mfr. Part No.CAF6-02M
BrandABB
TWD344.00
Each
units
2 2NC - Front Mount 12 A 240 V dc, 500 V ac DP Screw - - - CAF6 - -
RS Stock No. 493-0668
Mfr. Part No.276421 & DILA-XHI11
BrandEaton
TWD245.00
Each
units
2 NO/NC - Front Mount 4 A ac, 10 A dc 220 V dc, 500 V ac DPST Screw - - - DILA - -
RS Stock No. 791-2843
Mfr. Part No.A9C18309
TWD9,731.00
Each
units
- - Acti 9 DIN Rail Mount - 24 → 48 V ac - Screw -5°C +50°C -5 → +50 °C iACT - -
RS Stock No. 922-7213
Mfr. Part No.286055 & FAZ-XHINW1
BrandEaton
TWD899.00
Each
units
1 1CO - DIN Rail Mount 3 A ac, 500 mA dc 120 V dc, 240 V ac SPCO Screw - - - FAZ - -
RS Stock No. 685-1523
Mfr. Part No.BFX1020
BrandLovato
TWD348.00
Each
units
2 2NO - Snap-On - - - Screw - - - - - -
RS Stock No. 279-6315
Mfr. Part No.LA1KN04
TWD433.00
Each
units
4 4NC - Clip On 10 A 600 V ac 4P Screw - - - LA1K - -
RS Stock No. 711-6379
Mfr. Part No.1SBN010140R1322 CA4-22U
BrandABB
TWD702.00
Each
units
4 2NO/2NC - Front Mount 6 A 600 V dc, 690 V ac 4P Screw - - - CA4 - -
RS Stock No. 326-734
Mfr. Part No.010288 & 22DILE
BrandEaton
TWD580.00
Each
units
4 2NO/2NC - Front Mount 2.5 A dc, 4 A ac 220 V dc, 500 V ac 4PST Screw - - - DILE - -
New
RS Stock No. 211-2553
Mfr. Part No.LA1DZ40
TWD2,472.00
Each
units
- 2 NO (sealed) + 2 NO TeSys D DIN - 125 V - - - - - LA1D - -
RS Stock No. 223-4817
Mfr. Part No.39990701
BrandSocomec
TWD383.00
Each
units
1 NO - - 2.8 A dc, 3 A ac 48 V dc, 400 V ac SP - - - - - - -
RS Stock No. 121-6874
BrandRS PRO
TWD104.00
Each
units
- - - DIN Rail Mount - - - Screw -25°C +60°C -25 → +60 °C MSK - -
RS Stock No. 257-3746
Mfr. Part No.VZ20
TWD659.00
Each
units
2 2NO - - 12 A - DP - - - - VZ20 - -