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. 215-0747
Mfr. Part No.29450
£41.37
Each
Units
1 NO/NC - - 6 A 250 V dc, 690 V ac SPDT Screw - - - - Multi 9 -
RS Stock No. 394-9879
Mfr. Part No.LADN40
£16.51
Each
Units
4 4NO TeSys Front Mount 10 A - 4P Screw - - - - LADN -
RS Stock No. 333-546
Mfr. Part No.HI11-P1/P3-Z/SOND
BrandEaton
£9.65
Each
Units
2 NO/NC - Side Mount 10 A - - Screw - +50°C - - - -
RS Stock No. 791-2837
Mfr. Part No.A9A26927
£30.96
Each
Units
2 NO/NC Acti 9 DIN Rail Mount 2 A dc, 6 A ac 24 → 130 V dc, 240 → 415 V ac DP Screw -35°C +70°C -35 → +70 °C - iSD -
RS Stock No. 394-9885
Mfr. Part No.LADN31
£16.66
Each
Units
4 3NO/NC TeSys Front Mount 10 A - 4P Screw -5°C +60°C - - LADN -
RS Stock No. 246-5055
Mfr. Part No.3RV1901-1E
BrandSiemens
£8.24
Each
Units
2 NO/NC Sirius Classic Front Mount - - DP Screw - - - - 3RV1 -
RS Stock No. 818-277
Mfr. Part No.NHI11-PKZ0
BrandEaton
£9.63
Each
Units
2 NO/NC - Side Mount 2 A dc, 3.5 A ac 220 V dc, 500 V ac DPST Screw - - - - - -
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. 246-4507
Mfr. Part No.3RH1921-1FA22
BrandSiemens
£8.73
Each
Units
4 2NO/2NC - Front Mount 6 A - 4P Screw - - - - 3RH1 -
RS Stock No. 493-0680
Mfr. Part No.DILA-XHI22
BrandEaton
£10.37
Each
Units
4 2NO/2NC - Front Mount 4 A ac, 10 A dc 220 V dc, 500 V ac 4PST Screw - - - - DILA -
RS Stock No. 759-027
Mfr. Part No.LA1KN11
£7.02
Each
Units
2 NO/NC TeSys Clip On 10 A 600 V ac DP Screw - - - - LA1K -
RS Stock No. 746-0705
Mfr. Part No.3RH1921-1HA22
BrandSiemens
£9.60
Each
Units
4 2NO/2NC Sirius Classic Snap Front - - 4P Screw - - - - 3RH1 -
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. 394-9914
Mfr. Part No.LADN20
£9.40
Each
Units
2 2NO TeSys Front Mount 10 A - DP Screw - - - - LADN -
RS Stock No. 243-7533
Mfr. Part No.3RH1911-1FA22
BrandSiemens
£8.86
Each
Units
4 2NO/2NC Sirius Classic Snap-On 6 A - 4P Screw - - - - 3RH1 -
RS Stock No. 392-8973
Mfr. Part No.3RH1921-1CA01
BrandSiemens
£3.01
Each
Units
1 NC Sirius Classic Snap-On - - SP Screw - - - - 3RH1 -
RS Stock No. 521-4579
Mfr. Part No.5ST3010
BrandSiemens
£24.42
Each
Units
2 NO/NC Sentron DIN Rail Mount 6 A 230 V ac DP Screw -5°C +40°C -5 → +40 °C - 5ST3 -
RS Stock No. 791-2828
Mfr. Part No.A9A26929
£34.00
Each
Units
4 NO/NC + NO/NC Acti 9 DIN Rail Mount 2 A dc, 6 A ac 24 → 130 V dc, 240 → 415 V ac 4P Screw -35°C +70°C -35 → +70 °C - iOF -
RS Stock No. 706-1897
Mfr. Part No.3RV2901-1E
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 Screw -20°C +60°C -20 → +60 °C - 3RV2 -
RS Stock No. 400-1467
Mfr. Part No.LAD8N11
£12.34
Each
Units
- - - - - - - - - - - - LAD8 -
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