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. 706-0850
Mfr. Part No.3RH2911-1AA01
BrandSiemens
kr 60,43
Each
Units
1 NC Sirius Innovation Snap-On 6 A ac, 10 A dc 250 V dc, 690 V ac SPST Screw -25°C +60°C -25 +60 °C - 3RH2 -
RS Stock No. 735-2715
Mfr. Part No.3SB1400-0A
BrandSiemens
kr 159,52
Each
Units
2 NO/NC - Front Mount 10 A 220 V dc, 400 V ac DPST Screw -25°C +70°C -25 → +70 °C - - -
RS Stock No. 246-5055
Mfr. Part No.3RV1901-1E
BrandSiemens
kr 142,57
Each
Units
2 NO/NC Sirius Classic Front Mount - - DP Screw - - - - 3RV1 -
RS Stock No. 610-3537
Mfr. Part No.3LD9200-5C
BrandSiemens
kr 147,56
Each
Units
2 NO/NC - Floor - - DP - - - - 3D CAD Model - -
RS Stock No. 521-4585
Mfr. Part No.5ST3011
BrandSiemens
kr 151,83
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. 246-4507
Mfr. Part No.3RH1921-1FA22
BrandSiemens
kr 129,60
Each
Units
4 2NO/2NC - Front Mount 6 A - 4P Screw - - - - 3RH1 -
RS Stock No. 746-0705
Mfr. Part No.3RH1921-1HA22
BrandSiemens
kr 190,83
Each
Units
4 2NO/2NC Sirius Classic Snap Front - - 4P Screw - - - - 3RH1 -
RS Stock No. 246-4529
Mfr. Part No.3RH1921-1FA31
BrandSiemens
kr 190,83
Each
Units
4 3NO/NC Sirius Classic Front Mount 6 A - 4P Screw - - - - 3RH1 -
RS Stock No. 706-1901
Mfr. Part No.3RV2901-2A
BrandSiemens
kr 92,21
Each
Units
2 NO/NC Sirius Innovation Plug In 2 A dc, 10 A ac 250 V dc, 690 V ac DP Cage Clamp -20°C +60°C -20 +60 °C - 3RV2 -
RS Stock No. 706-0936
Mfr. Part No.3RH2911-1HA31
BrandSiemens
kr 130,19
Each
Units
4 3NO/NC 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. 521-4579
Mfr. Part No.5ST3010
BrandSiemens
kr 151,83
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. 706-0951
Mfr. Part No.3RH2911-2FB22
BrandSiemens
kr 240,42
Each
Units
4 2NO/2NC Sirius Innovation Snap-On 6 A dc, 10 A ac 250 V dc, 690 V ac 4PST Cage Clamp -25°C +60°C -25 +60 °C - - -
RS Stock No. 706-0860
Mfr. Part No.3RH2911-1DA02
BrandSiemens
kr 116,54
Each
Units
2 2NC Sirius Innovation Snap-On 10 A 250 V dc, 690 V ac DPST Screw -25°C +60°C -25 +60 °C - - -
RS Stock No. 706-1891
Mfr. Part No.3RV2901-1F
BrandSiemens
kr 91,10
Each
Units
2 2NO 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 - - -
RS Stock No. 772-1228
Mfr. Part No.5SW3300
BrandSiemens
kr 253,57
Each
Units
2 NO/NC Sentron DIN Rail Mount 6 A 230 V ac - - - - - - 5SW3 -
RS Stock No. 746-0711
Mfr. Part No.3RH1921-1LA11
BrandSiemens
kr 115,51
Each
Units
2 NO/NC Sirius Classic Snap Front - - DP Screw - - - - 3RH1 -
RS Stock No. 136-3687
Mfr. Part No.3RH2911-2DE11
BrandSiemens
kr 421,20
Each
Units
2 NO/NC Sirius Innovation Snap-On 10 A 220 V dc DPST Spring Load -25°C +60°C -25 → +60 °C - 3RH29 -
RS Stock No. 122-9427
Mfr. Part No.3RH2921-2DA11
BrandSiemens
kr 119,27
Each
Units
2 NO/NC Sirius Innovation Snap-On 10 A 690 V SPST Cage Clamp -25°C +60°C -25 +60 °C - 3RH29 -
RS Stock No. 136-3683
Mfr. Part No.3RH2911-1XA04-0MA0
BrandSiemens
kr 189,22
Each
Units
4 4NC Sirius Innovation Snap-On 10 A 600 V dc, 690 V ac 4PST Screw -25°C +60°C -25 → +60 °C - 3RH29 -
RS Stock No. 706-0863
Mfr. Part No.3RH2911-1BA01
BrandSiemens
kr 60,43
Each
Units
1 NC Sirius Innovation Snap-On 6 A ac, 10 A dc 250 V dc, 690 V ac SPST Screw -25°C +60°C -25 +60 °C - 3RH2 -