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 Dimensions External Length
RS Stock No. 735-2715
Mfr. Part No.3SB1400-0A
BrandSiemens
TWD532.00
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. 124-3131
Mfr. Part No.5ST3030
BrandSiemens
TWD1,727.00
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
TWD2,495.00
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
TWD260.00
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. 392-8967
Mfr. Part No.3RH1921-1CA10
BrandSiemens
TWD136.00
Each
units
1 NO Sirius Classic Snap-On - - SP Screw - - - 3RH1 - -
RS Stock No. 392-8973
Mfr. Part No.3RH1921-1CA01
BrandSiemens
TWD135.00
Each
units
1 NC Sirius Classic Snap-On - - SP Screw - - - 3RH1 - -
RS Stock No. 706-0850
Mfr. Part No.3RH2911-1AA01
BrandSiemens
TWD200.00
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. 124-3128
Mfr. Part No.5ST3020
BrandSiemens
TWD1,170.00
Each
units
- - Sentron - - - - - - - - 5ST3 - -
RS Stock No. 751-5717
Mfr. Part No.3RT1916-2EC21
BrandSiemens
TWD2,276.00
Each
units
2 NO/NC Sirius Classic - - - - Screw -25°C +60°C -25 +60 °C 3RT1 - -
RS Stock No. 706-0939
Mfr. Part No.3RH2911-2DA02
BrandSiemens
TWD414.00
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 - - -
RS Stock No. 746-0783
Mfr. Part No.3RH2911-1GA04
BrandSiemens
TWD445.00
Each
units
4 4NC Sirius Innovation Snap Front 10 A 600 V dc, 690 V ac 4P Screw - - -25 +60 °C 3RH2 - -
RS Stock No. 706-0854
Mfr. Part No.3RH2911-1AA10
BrandSiemens
TWD206.00
Each
units
1 NO Sirius Innovation Snap-On 6 A dc, 10 A ac 250 V dc, 690 V ac SPST Screw -25°C +60°C -25 +60 °C 3RH2 - -
RS Stock No. 706-0885
Mfr. Part No.3RH2911-1FA40
BrandSiemens
TWD445.00
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. 392-7576
Mfr. Part No.3RH1921-2FA04
BrandSiemens
TWD453.00
Each
units
4 4NC Sirius Classic Front Mount - - 4P Cage Clamp - - - 3RH1 - -
RS Stock No. 706-0973
Mfr. Part No.3RH2911-2HA11
BrandSiemens
TWD264.00
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. 746-0718
Mfr. Part No.3RH1921-1JA11
BrandSiemens
TWD354.00
Each
units
2 NO/NC Sirius Classic Lateral - - DP Screw - - - 3RH1 - -
RS Stock No. 706-1910
Mfr. Part No.3RV2901-2F
BrandSiemens
TWD337.00
Each
units
2 2NO Sirius Innovation Plug In 1 A dc, 2.5 A ac 60 V dc, 230 V ac DP Cage Clamp -20°C +60°C -20 +60 °C - - -
RS Stock No. 124-3139
Mfr. Part No.5ST3045
BrandSiemens
TWD2,707.00
Each
units
- - Sentron - - - - - - - - 5ST3 - -
RS Stock No. 706-0958
Mfr. Part No.3RH2911-2FB11
BrandSiemens
TWD516.00
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 - - -