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 Width
RS Stock No. 706-0850
Mfr. Part No.3RH2911-1AA01
BrandSiemens
kr 74,68
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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. 610-3537
Mfr. Part No.3LD9200-5C
BrandSiemens
kr 147,56
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Units
2 NO/NC - Floor - - DP - - - - 3D CAD Model - -
RS Stock No. 521-4585
Mfr. Part No.5ST3011
BrandSiemens
kr 192,42
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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 133,50
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4 2NO/2NC - Front Mount 6 A - 4P Screw - - - - 3RH1 -
RS Stock No. 746-0705
Mfr. Part No.3RH1921-1HA22
BrandSiemens
kr 209,87
Each
Units
4 2NO/2NC Sirius Classic Snap Front - - 4P Screw - - - - 3RH1 -
RS Stock No. 706-0939
Mfr. Part No.3RH2911-2DA02
BrandSiemens
kr 143,57
Each
Units
2 2NC Sirius Innovation Snap-On 10 A 250 V dc, 690 V ac DPST Cage Clamp -25°C +60°C -25 +60 °C - - -
RS Stock No. 706-0942
Mfr. Part No.3RH2911-2DA20
BrandSiemens
kr 143,57
Each
Units
2 2NO Sirius Innovation Snap-On 10 A 250 V dc, 690 V ac DPST Cage Clamp -25°C +60°C -25 +60 °C - - -
RS Stock No. 706-0973
Mfr. Part No.3RH2911-2HA11
BrandSiemens
kr 95,31
Each
Units
2 NO/NC Sirius Innovation Snap-On 6 A dc, 10 A ac 250 V dc, 690 V ac DPST Cage Clamp -25°C +60°C -25 +60 °C - - -
RS Stock No. 706-0977
Mfr. Part No.3RH2911-2HA12
BrandSiemens
kr 129,61
Each
Units
3 NO/2NC Sirius Innovation Snap-On 6 A ac, 10 A dc 250 V dc, 690 V ac 3PST Cage Clamp -25°C +60°C -25 +60 °C - - -
RS Stock No. 706-0945
Mfr. Part No.3RH2911-2FA04
BrandSiemens
kr 160,52
Each
Units
4 4NC Sirius Innovation Snap-On 6 A ac, 10 A dc 250 V dc, 690 V ac 4PST Cage Clamp -25°C +60°C -25 +60 °C - 3RH2 -
RS Stock No. 706-0949
Mfr. Part No.3RH2911-2FA40
BrandSiemens
kr 160,52
Each
Units
4 4NO Sirius Innovation Snap-On 6 A ac, 10 A dc 250 V dc, 690 V ac 4PST Cage Clamp -25°C +60°C -25 +60 °C - 3RH2 -
RS Stock No. 706-0983
Mfr. Part No.3RH2911-2HA21
BrandSiemens
kr 129,61
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Units
3 2NO/NC Sirius Innovation Snap-On 6 A dc, 10 A ac 250 V dc, 690 V ac 3PST Cage Clamp -25°C +60°C -25 +60 °C - - -
RS Stock No. 124-3128
Mfr. Part No.5ST3020
BrandSiemens
kr 296,11
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Units
- - Sentron - - - - - - - - - 5ST3 -
RS Stock No. 706-0951
Mfr. Part No.3RH2911-2FB22
BrandSiemens
kr 287,14
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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. 521-4579
Mfr. Part No.5ST3010
BrandSiemens
kr 192,42
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. 122-9511
Mfr. Part No.3RV2901-1G
BrandSiemens
kr 349,95
Each
Units
1 CO Sirius Innovation Plug In 300 mA 60 V @ 0.3 A SPDT-CO Screw -20°C +60°C -20 → +60 °C - 3RV29 -
RS Stock No. 124-3129
Mfr. Part No.5ST3021
BrandSiemens
kr 296,11
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Units
- - Sentron - - - - - - - - - 5ST3 -
RS Stock No. 706-0866
Mfr. Part No.3RH2911-1BA10
BrandSiemens
kr 74,68
Each
Units
1 NO 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. 706-0927
Mfr. Part No.3RH2911-1HA30
BrandSiemens
kr 129,61
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Units
3 3NO Sirius Innovation Snap-On 6 A dc, 10 A ac 250 V dc, 690 V ac 3PST Screw -25°C +60°C -25 +60 °C - - -
RS Stock No. 746-0799
Mfr. Part No.3RH2911-1GA31
BrandSiemens
kr 160,52
Each
Units
4 3NO/NC Sirius Innovation Snap Front 10 A 600 V dc, 690 V ac 4P Screw - - -25 +60 °C - 3RH2 -