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. 238-1086
Mfr. Part No.100-FA31
£18.90
Each
Units
4 3NO/NC - Front Mount 10 A - 4PST Screw - - - 100F - -
RS Stock No. 394-9964
Mfr. Part No.LADN04
£15.72
Each
Units
4 4NC - Front Mount - - 4P Screw - - - LADN - -
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. 187-908
Mfr. Part No.LADN11G
£8.70
Each
Units
2 NO/NC - Front Mount 10 A 690 V ac DP Screw -5°C +60°C -5 → +60 °C LADN - -
RS Stock No. 706-1888
Mfr. Part No.3RV2901-1A
BrandSiemens
£7.29
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. 122-0780
Mfr. Part No.ACBF-11
BrandWEG
£6.61
Each
Units
2 NO/NC - Front Mount 2.5 A 250 V ac DPST Screw - - -20 → +70 °C ACBF - -
RS Stock No. 521-4585
Mfr. Part No.5ST3011
BrandSiemens
£23.48
Each
Units
2 2NO Sentron DIN Rail Mount 6 A 230 V ac DP Screw -5°C +40°C -5 → +40 °C 5ST3 - -
RS Stock No. 124-3128
Mfr. Part No.5ST3020
BrandSiemens
£25.02
Each
Units
- - Sentron - - - - - - - - 5ST3 - -
RS Stock No. 614-0851
Mfr. Part No.2CDS200970R0002
BrandABB
£16.68
Each
Units
1 NO - - 2 A 230 V ac, 50 V dc SP - - - - - - -
RS Stock No. 711-6354
Mfr. Part No.CA4-22E
BrandABB
£14.85
Each
Units
4 2NO/2NC - Front Mount 6 A 600 V dc, 690 V ac 4P Screw - - - CA4 - -
RS Stock No. 243-7511
Mfr. Part No.3RH1911-1FA20
BrandSiemens
£6.24
Each
Units
2 2NO Sirius Classic Snap-On 6 A - DP Screw - - - 3RH1 - -
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. 392-8995
Mfr. Part No.3RH1921-2CA01
BrandSiemens
£2.96
Each
Units
1 NC Sirius Classic Snap-On - - SP Cage Clamp - - - 3RH1 - -
RS Stock No. 521-4591
Mfr. Part No.5ST3012
BrandSiemens
£23.48
Each
Units
2 2NC Sentron DIN Rail Mount 6 A 230 V ac DP Screw -5°C +40°C -5 → +40 °C 5ST3 - -
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. 187-560
Mfr. Part No.VZN05
£6.67
Each
Units
1 NO - - - - SP - - - - VZN0 - -
RS Stock No. 445-0415
Mfr. Part No.1SAM201901R1001
BrandABB
£8.99
Each
Units
2 NO/NC - Front Mount 1 A dc, 3 A ac 220 V dc, 230 V ac DP - - - - HK1 - -
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