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 Priced to Clear Series External Dimensions
RS Stock No. 706-0885
Mfr. Part No.3RH2911-1FA40
BrandSiemens
£9.89
Each
Units
4 4NO 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. 351-5628
Mfr. Part No.140M-C-AFAR10A01
£10.80
Each
Units
2 NO/NC - Front Mount - - DPST Screw - - - - 140 -
RS Stock No. 825-6107
Mfr. Part No.P1X1011
BrandLovato
£15.76
Each
Units
1 CO - Side Mount 3 A, 6 A 230 V, 400 V SPDT Screw - - - - - -
RS Stock No. 831-9191
Mfr. Part No.1SDA066423R1
BrandABB
£20.02
Each
Units
1 CO - - - 24 V dc - - - - - - XT1 -
RS Stock No. 413-1669
Mfr. Part No.GVAE113
£9.92
Each
Units
2 NO/NC - Front Mount - 60 V dc, 240 V ac DP - - - - - GVAE -
RS Stock No. 261-8136
Mfr. Part No.194E-A-P22
£17.10
Each
Units
4 2NO/2NC - Side Mount 6 A 17 V dc 4P - -20°C +55°C -20 → +55 °C - 194 -
RS Stock No. 791-2852
Mfr. Part No.A9C15419
£67.00
Each
Units
- - Acti 9 DIN Rail Mount - 12 → 48 V ac - Screw -5°C +50°C -5 → +50 °C - iATET -
RS Stock No. 502-199
Mfr. Part No.100-KFA22Z
£11.60
Each
Units
4 2NO/2NC - Snap-On - - 4PST Screw - - - - 100K -
RS Stock No. 610-3127
Mfr. Part No.GVAE113
£9.92
Each
Units
2 NO/NC - Front Mount - 60 V dc, 240 V ac DP - - - - - GVAE -
RS Stock No. 122-0928
Mfr. Part No.BFC0-11
BrandWEG
£5.38
Each
Units
2 NO/NC - Front Mount 10 A 690 V ac DPST Screw - - -25 → +55 °C - BFC0 -
RS Stock No. 714-1773
Mfr. Part No.SAUX2EB
£11.32
Each
Units
2 - - Side Mount - - DP Screw - - - - - -
RS Stock No. 608-8983
Mfr. Part No.LA1LC010
£229.00
Each
Units
6 5NO/NC - Side Mount - - 6P Screw - - - - LA1L -
RS Stock No. 209-5808
Mfr. Part No.M5723207
BrandMETCASE
£67.16
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 714-1934
Mfr. Part No.SAUXCO
£11.32
Each
Units
2 NO/NC - Side Mount - - DP Screw - - - - - -
RS Stock No. 467-9666
Mfr. Part No.31DILE
BrandEaton
£13.55
Each
Units
4 3NO/NC - Front Mount 2.5 A dc, 4 A ac 220 V dc, 500 V ac 4PST Screw - - - - - -
RS Stock No. 279-6321
Mfr. Part No.LA1KN13
£12.18
Each
Units
4 NO/3NC - Clip On 10 A 600 V ac 4P Screw - - - - LA1K -
RS Stock No. 776-2954
Mfr. Part No.A9N26927
£35.10
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. 493-9126
Mfr. Part No.LUFN20
£9.73
Each
Units
2 2NO TeSys U Series - 5 A 24 → 250 V ac/dc - - - - - - - -
RS Stock No. 791-2840
Mfr. Part No.A9C15916
£42.00
Each
Units
2 2NO Acti 9 DIN Rail Mount 2 A 24 → 130 V dc, 24 → 240 V ac DP Screw -5°C +50°C - - iACT -
RS Stock No. 776-1572
Mfr. Part No.022.35
BrandFinder
£19.89
Each
Units
1 NO/NC - DIN Rail Mount 6 A 230 V DPST Screw - - - - 22 Series -
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