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 Series External Width External Dimensions
RS Stock No. 124-3131
Mfr. Part No.5ST3030
BrandSiemens
TWD1,507.00
Each
units
- - Sentron - - - - - - - - 5ST3 - -
RS Stock No. 706-0911
Mfr. Part No.3RH2911-1HA20
BrandSiemens
TWD264.00
Each
units
2 2NO Sirius Innovation Snap-On 6 A ac, 10 A dc 250 V dc, 690 V ac DPST Screw -25°C +60°C -25 → +60 °C 3RH2 - -
RS Stock No. 751-5714
Mfr. Part No.3RT1916-2FK21
BrandSiemens
TWD4,809.00
Each
units
2 NO/NC Sirius Classic DIN Rail Mount - - - Screw -25°C +60°C -25 → +60 °C 3RT1 - -
RS Stock No. 706-0905
Mfr. Part No.3RH2911-1HA11
BrandSiemens
TWD276.00
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. 392-8973
Mfr. Part No.3RH1921-1CA01
BrandSiemens
TWD209.00
Each
units
1 NC Sirius Classic Snap-On - - SP Screw - - - 3RH1 - -
RS Stock No. 392-8967
Mfr. Part No.3RH1921-1CA10
BrandSiemens
TWD143.00
Each
units
1 NO Sirius Classic Snap-On - - SP Screw - - - 3RH1 - -
RS Stock No. 706-0958
Mfr. Part No.3RH2911-2FB11
BrandSiemens
TWD770.00
Each
units
2 NO/NC Sirius Innovation Snap-On 6 A ac, 10 A dc 250 V dc, 690 V ac DPST Cage Clamp -25°C +60°C -25 → +60 °C - - -
RS Stock No. 136-3697
Mfr. Part No.3RH2911-4FA40
BrandSiemens
TWD645.00
Each
units
4 4NO Sirius Innovation Snap-On 10 A 600 V dc, 690 V ac 4PST Ring Cable -25°C +60°C -25 → +60 °C 3RH29 - -
RS Stock No. 706-0961
Mfr. Part No.3RH2911-2HA03
BrandSiemens
TWD521.00
Each
units
3 3NC 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. 122-9427
Mfr. Part No.3RH2921-2DA11
BrandSiemens
TWD577.00
Each
units
2 1NO/1NC Sirius Innovation Snap-On 10 A 690 V SPST Cage Clamp -25°C +60°C -25 → +60 °C 3RH29 - -
RS Stock No. 392-8995
Mfr. Part No.3RH1921-2CA01
BrandSiemens
TWD209.00
Each
units
1 NC Sirius Classic Snap-On - - SP Cage Clamp - - - 3RH1 - -
New
RS Stock No. 210-3471
Mfr. Part No.3RH2911-2NF02
BrandSiemens
TWD1,511.00
Each
units
2 2NC SIRIUS Snap- On 300 mA 690 V - - - - - - - -
RS Stock No. 706-0908
Mfr. Part No.3RH2911-1HA03
BrandSiemens
TWD521.00
Each
units
3 3NC 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. 706-0999
Mfr. Part No.3RH2911-2HA31
BrandSiemens
TWD658.00
Each
units
4 3NO/NC 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 - - -
RS Stock No. 203-2097
Mfr. Part No.3RH2911-2GA22
BrandSiemens
TWD645.00
Each
units
4 2NO/2NC SIRIUS Snap-On 10 A 17 V dc - - - - - 3RH2911 - -
RS Stock No. 203-2141
Mfr. Part No.3RH1921-1XA22-0MA0
BrandSiemens
TWD713.00
Each
units
4 2NO/2NC SIRIUS Snap-On 10 A 17 V dc - - - - - 3RH1921 - -
RS Stock No. 122-9423
Mfr. Part No.3RH2911-1MA20
BrandSiemens
TWD421.00
Each
units
2 2NO Sirius Innovation Snap-On 10 A 690 V DP Screw -25°C +60°C -25 → +60 °C 3RH2 - -
RS Stock No. 706-1881
Mfr. Part No.3RV2901-1B
BrandSiemens
TWD337.00
Each
units
2 2NO Sirius Innovation Plug In 2 A dc, 10 A ac 250 V dc, 690 V ac DP Screw -20°C +60°C -20 → +60 °C 3RV2 - -
RS Stock No. 706-0964
Mfr. Part No.3RH2911-2HA01
BrandSiemens
TWD305.00
Each
units
1 NC Sirius Innovation Snap-On 6 A ac, 10 A dc 250 V dc, 690 V ac SPST Cage Clamp -25°C +60°C -25 → +60 °C 3RH2 - -
RS Stock No. 706-0939
Mfr. Part No.3RH2911-2DA02
BrandSiemens
TWD577.00
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 - - -