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 Number of Timing Ranges
RS Stock No. 662-9341
Mfr. Part No.LADN10
£9.27
Each
Units
1 NO - Front Mount - 690 V ac SP Screw -5°C +60°C -5 → +60 °C - LADN -
RS Stock No. 746-0718
Mfr. Part No.3RH1921-1JA11
BrandSiemens
£7.86
Each
Units
2 NO/NC Sirius Classic Lateral - - DP Screw - - - - 3RH1 -
RS Stock No. 326-627
Mfr. Part No.11DILEM
BrandEaton
£7.00
Each
Units
2 NO/NC - Front Mount 2.5 A dc, 4 A ac 220 V dc, 500 V ac DPST Screw - - - - - -
RS Stock No. 493-0674
Mfr. Part No.DILA-XHI31
BrandEaton
£10.37
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. 400-1401
Mfr. Part No.GVAM11
£15.68
Each
Units
1 NO/NC - Side Mount - - SPDT Screw - - - - GVAM -
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. 513-0213
Mfr. Part No.DILM150-XHI31
BrandEaton
£10.37
Each
Units
4 3NO/NC - Front Mount 4 A ac, 10 A dc 220 V dc, 500 V ac 4PST Screw - - - - DILM -
RS Stock No. 314-286
Mfr. Part No.3TX4010-2A
BrandSiemens
£5.39
Each
Units
1 NO - Plug In 6 A - SP - - - - - 3TX4 -
RS Stock No. 262-0987
Mfr. Part No.LA1SK11
£9.11
Each
Units
2 NO/NC - Clip On - - DP Screw - - - - LA1S -
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. 800-7286
Mfr. Part No.1SFN010820R1011
BrandABB
£20.04
Each
Units
4 NC, NO - Side Mount 6 A 690 V ac DP Screw - - - - CAL19 -
RS Stock No. 706-0905
Mfr. Part No.3RH2911-1HA11
BrandSiemens
£5.87
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. 433-7766
Mfr. Part No.VZ13
£28.61
Each
Units
- - - Side Mount 140 A - - - - - - - VZ13 -
RS Stock No. 246-5077
Mfr. Part No.3RV1901-1B
BrandSiemens
£7.43
Each
Units
2 2NO Sirius Classic Side Mount 2 A 24 V ac DP - - +60°C Maximum of +60 °C - 3RV1 -
RS Stock No. 435-421
Mfr. Part No.2CCS800900R0021
BrandABB
£36.32
Each
Units
2 2NO/2NC - DIN Rail Mount 4 A dc, 6 A ac 250 V dc, 400 V ac DPDT Screw -25°C +60°C -25 → +60 °C - S800 -
RS Stock No. 395-0166
Mfr. Part No.GVAD1001
£14.37
Each
Units
2 NO/NC - Side Mount - 240 V dc, 690 V ac DP Screw - - - - GVAD -
RS Stock No. 243-9898
Mfr. Part No.GAC0521
£31.10
Each
Units
2 NO/NC - Clip On - - DP - - - - - GAC0 -
RS Stock No. 373-2306
Mfr. Part No.YM-300
£18.61
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 706-1917
Mfr. Part No.3RV2901-2E
BrandSiemens
£7.49
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. 467-9650
Mfr. Part No.04DILE
BrandEaton
£12.65
Each
Units
4 4NC - Front Mount 2.5 A dc, 4 A ac 220 V dc, 500 V ac 4PST Screw - - - - - -
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