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 CAD Drawing Series External Dimensions
RS Stock No. 818-277
Mfr. Part No.NHI11-PKZ0
BrandEaton
€11.73
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. 394-9908
Mfr. Part No.LADN22
€15.58
Each
units
4 2NO/2NC TeSys Front Mount 10 A 600 V ac 4P Screw -5°C +60°C - - LADN -
RS Stock No. 395-0144
Mfr. Part No.GVAE11
€7.99
Each
units
2 NO/NC TeSys Front Mount 2.5 A 60 V dc, 240 V ac DP Screw - - - - GVAE -
RS Stock No. 791-2824
Mfr. Part No.A9A26924
€29.47
Each
units
1 NO/NC Acti 9 DIN Rail Mount 2 A dc, 6 A ac 24 130 V dc, 240 415 V ac SPCO Screw -35°C +70°C -35 +70 °C - iOF -
RS Stock No. 351-5561
Mfr. Part No.140M-C-AFA11
€11.40
Each
units
2 NO/NC - Front Mount - - DPST Screw - - - - 140 -
RS Stock No. 244-0107
Mfr. Part No.NHI-E-11-PKZ0
BrandEaton
€10.52
Each
units
2 NO/NC - Front Mount 1 A ac, 2 A dc 24 V dc, 240 V ac DPST Screw - - - - - -
RS Stock No. 759-055
Mfr. Part No.LA1KN22
€11.65
Each
units
4 2NO/2NC TeSys Clip On 10 A 600 V ac 4P Screw - - -25 → 50 °C - LA1K -
RS Stock No. 746-0705
Mfr. Part No.3RH1921-1HA22
BrandSiemens
€14.39
Each
units
4 2NO/2NC Sirius Classic Snap Front - - 4P Screw - - - - 3RH1 -
RS Stock No. 392-8967
Mfr. Part No.3RH1921-1CA10
BrandSiemens
€3.91
Each
units
1 NO Sirius Classic Snap-On - - SP Screw - - - - 3RH1 -
RS Stock No. 395-0122
Mfr. Part No.GVAN11
€8.14
Each
units
2 NO/NC TeSys Side Mount 6 A 240 V dc, 690 V ac DP Screw - - - - GVAN -
RS Stock No. 394-9879
Mfr. Part No.LADN40
€15.58
Each
units
4 4NO TeSys Front Mount 10 A - 4P Screw - - - - LADN -
RS Stock No. 246-4507
Mfr. Part No.3RH1921-1FA22
BrandSiemens
€11.35
Each
units
4 2NO/2NC - Front Mount 6 A - 4P Screw - - - - 3RH1 -
RS Stock No. 238-1070
Mfr. Part No.100-FA22
€24.90
Each
units
4 2NO/2NC - Front Mount 10 A - 4PST Screw - - - - 100F -
RS Stock No. 493-0680
Mfr. Part No.DILA-XHI22
BrandEaton
€11.36
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. 246-5055
Mfr. Part No.3RV1901-1E
BrandSiemens
€12.32
Each
units
2 NO/NC Sirius Classic Front Mount - - DP Screw - - - - 3RV1 -
RS Stock No. 513-0229
Mfr. Part No.DILM150-XHI22
BrandEaton
€12.62
Each
units
4 2NO/2NC - Front Mount 4 A ac, 10 A dc 220 V dc, 500 V ac 4PST Screw - - - - DILM -
RS Stock No. 706-0882
Mfr. Part No.3RH2911-1FB22
BrandSiemens
€23.00
Each
units
4 2NO/2NC Sirius Innovation Snap-On 6 A ac, 10 A dc 250 V dc, 690 V ac 4PST Screw -25°C +60°C -25 +60 °C - 3RH2 -
RS Stock No. 706-0885
Mfr. Part No.3RH2911-1FA40
BrandSiemens
€12.86
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. 238-1115
Mfr. Part No.100-SB10
€7.86
Each
units
1 NO - Side Mount 10 A - SPST Screw - - - - 100S -
RS Stock No. 502-313
Mfr. Part No.100-KFA04E
€18.40
Each
units
4 4NC - Snap-On - - 4PST Screw - - - - 100K -
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