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. 706-0905
Mfr. Part No.3RH2911-1HA11
BrandSiemens
$28.65
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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. 751-5751
Mfr. Part No.3RT1926-2FJ31
BrandSiemens
$157.23
Each
units
2 NO/NC Sirius Classic - 20 mA - - Screw -25°C +60°C -25 +60 °C 3RT1 - -
RS Stock No. 521-4579
Mfr. Part No.5ST3010
BrandSiemens
$56.11
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. 706-1897
Mfr. Part No.3RV2901-1E
BrandSiemens
$17.21
Each
units
2 NO/NC 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 3RV2 - -
RS Stock No. 706-1894
Mfr. Part No.3RV2901-1D
BrandSiemens
$15.51
Each
units
1 NO/NC Sirius Innovation Plug In 1 A dc, 10 A ac 250 V dc, 690 V ac SPDT Screw -20°C +60°C -20 +60 °C 3RV2 - -
RS Stock No. 392-8973
Mfr. Part No.3RH1921-1CA01
BrandSiemens
$7.23
Each
units
1 NC Sirius Classic Snap-On - - SP Screw - - - 3RH1 - -
RS Stock No. 706-1888
Mfr. Part No.3RV2901-1A
BrandSiemens
$18.93
Each
units
2 NO/NC 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. 706-1885
Mfr. Part No.3RV2901-1C
BrandSiemens
$18.81
Each
units
2 2NC 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 - - -
RS Stock No. 706-0850
Mfr. Part No.3RH2911-1AA01
BrandSiemens
$11.52
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. 706-1881
Mfr. Part No.3RV2901-1B
BrandSiemens
$17.21
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. 246-5061
Mfr. Part No.3RV1901-1A
BrandSiemens
$18.94
Each
units
2 NO/NC Sirius Classic Side Mount 2 A 24 V ac DP Screw - +60°C Maximum of +60 °C 3RV1 - -
RS Stock No. 392-8967
Mfr. Part No.3RH1921-1CA10
BrandSiemens
$23.58
Each
units
1 NO Sirius Classic Snap-On - - SP Screw - - - 3RH1 - -
RS Stock No. 746-0705
Mfr. Part No.3RH1921-1HA22
BrandSiemens
$22.06
Each
units
4 2NO/2NC Sirius Classic Snap Front - - 4P Screw - - - 3RH1 - -
RS Stock No. 521-4585
Mfr. Part No.5ST3011
BrandSiemens
$56.11
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. 521-4591
Mfr. Part No.5ST3012
BrandSiemens
$56.11
Each
units
2 2NC Sentron DIN Rail Mount 6 A 230 V ac DP Screw -5°C +40°C -5 +40 °C 5ST3 - -
RS Stock No. 392-9061
Mfr. Part No.3RV1901-2A
BrandSiemens
$13.79
Each
units
2 NO/NC Sirius Classic Side Mount - - DP Cage Clamp - - - 3RV1 - -
RS Stock No. 246-4513
Mfr. Part No.3RH1921-1FA04
BrandSiemens
$22.67
Each
units
4 4NC Sirius Classic Front Mount 6 A - 4P Screw - - - 3RH1 - -
RS Stock No. 746-0806
Mfr. Part No.3RH2921-1DA02
BrandSiemens
$20.48
Each
units
2 2NC Sirius Innovation Lateral 10 A 600 V dc, 690 V ac DP Screw - - -25 +60 °C 3RH2 - -
RS Stock No. 136-3697
Mfr. Part No.3RH2911-4FA40
BrandSiemens
$22.81
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. 746-0796
Mfr. Part No.3RH2911-1GA22
BrandSiemens
$23.15
Each
units
4 2NO/2NC Sirius Innovation Snap Front 10 A 600 V dc, 690 V ac 4P Screw - - -25 +60 °C 3RH2 - -