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 Number of Timing Ranges External Dimensions
RS Stock No. 351-5561
Mfr. Part No.140M-C-AFA11
£7.07
Each
Units
2 NO/NC - Front Mount - - DPST Screw - - - 140 - -
RS Stock No. 238-1070
Mfr. Part No.100-FA22
£18.90
Each
Units
4 2NO/2NC - Front Mount 10 A - 4PST Screw - - - 100F - -
RS Stock No. 351-5583
Mfr. Part No.140M-C-ASA11
£8.81
Each
Units
2 NO/NC - Side Mount - - DPST Screw - - - 140 - -
RS Stock No. 238-1064
Mfr. Part No.100-FA11
£9.56
Each
Units
2 NO/NC - Front Mount 10 A - DPST Screw - - - 100F - -
RS Stock No. 238-1121
Mfr. Part No.100-SB11
£9.56
Each
Units
2 NC, NO - Side Mount 10 A - SPST Screw - - - 100S - -
RS Stock No. 238-1086
Mfr. Part No.100-FA31
£18.90
Each
Units
4 3NO/NC - Front Mount 10 A - 4PST Screw - - - 100F - -
RS Stock No. 502-171
Mfr. Part No.100-KFC11
£5.92
Each
Units
2 NO/NC - Snap-On 12 A - DPST Screw - - - 100K - -
RS Stock No. 422-9299
Mfr. Part No.194E-A-P11
£8.54
Each
Units
2 NO/NC - Side Mount 6 A 17 V dc DP - -20°C +55°C -20 → +55 °C 194 - -
RS Stock No. 422-9283
Mfr. Part No.194E-E-P11
£8.54
Each
Units
2 NO/NC - Side Mount 10 A 8 V dc DP - -20°C +55°C -20 → +55 °C 194 - -
RS Stock No. 351-5577
Mfr. Part No.140M-C-AFA20
£7.07
Each
Units
2 2NO - Front Mount - - DPST Screw - - - 140 - -
RS Stock No. 238-1115
Mfr. Part No.100-SB10
£5.96
Each
Units
1 NO - Side Mount 10 A - SPST Screw - - - 100S - -
RS Stock No. 238-1092
Mfr. Part No.100-FA40
£18.90
Each
Units
4 4NO - Front Mount 10 A - 4PST Screw - - - 100F - -
RS Stock No. 351-5549
Mfr. Part No.140M-C-AFA10
£5.73
Each
Units
1 NO - Front Mount - - SPST Screw - - - 140 - -
RS Stock No. 351-5612
Mfr. Part No.140M-C-AFAR10A10
£10.80
Each
Units
2 NO/NC - Front Mount - - DPST Screw - - - 140 - -
RS Stock No. 238-1036
Mfr. Part No.100-FA20
£9.56
Each
Units
2 2NO - Front Mount 10 A - DPST Screw - - - 100F - -
RS Stock No. 351-5599
Mfr. Part No.140M-C-ASA20
£8.81
Each
Units
2 2NO - Side Mount - - DPST Screw - - - 140 - -
RS Stock No. 502-452
Mfr. Part No.100-KFC22
£11.60
Each
Units
4 2NO/2NC - Snap-On 12 A - 4PST Screw - - - 100K - -
RS Stock No. 238-1058
Mfr. Part No.100-FA02
£9.56
Each
Units
2 2NC - Front Mount 10 A - DPST Screw - - - 100F - -
RS Stock No. 351-5656
Mfr. Part No.140M-C-ASAR01M10
£14.80
Each
Units
2 NO/NC - Side Mount - - DP - - - - 140 - -
RS Stock No. 351-5628
Mfr. Part No.140M-C-AFAR10A01
£10.80
Each
Units
2 NO/NC - Front Mount - - DPST Screw - - - 140 - -