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 Number of Timing Ranges External Dimensions
RS Stock No. 746-0705
Mfr. Part No.3RH1921-1HA22
BrandSiemens
$80.55
Each
units
4 2NO/2NC Sirius Classic Snap Front - - 4P Screw - - - 3RH1 - -
RS Stock No. 735-2715
Mfr. Part No.3SB1400-0A
BrandSiemens
$35.64
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. 243-7533
Mfr. Part No.3RH1911-1FA22
BrandSiemens
$63.61
Each
units
4 2NO/2NC Sirius Classic Snap-On 6 A - 4P Screw - - - 3RH1 - -
RS Stock No. 706-0923
Mfr. Part No.3RH2911-1HA22
BrandSiemens
$22.27
Each
units
4 2NO/2NC 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. 706-1897
Mfr. Part No.3RV2901-1E
BrandSiemens
$48.17
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. 243-7202
Mfr. Part No.3RV1901-1D
BrandSiemens
$14.28
Each
units
1 NO/NC Sirius Classic Front Mount 2 A 24 V ac SPDT Screw - +60°C Maximum of +60 °C 3RV1 - -
RS Stock No. 746-0783
Mfr. Part No.3RH2911-1GA04
BrandSiemens
$20.55
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. 746-0796
Mfr. Part No.3RH2911-1GA22
BrandSiemens
$20.55
Each
units
4 2NO/2NC Sirius Innovation Snap Front 10 A 600 V dc, 690 V ac 4P Screw - - -25 → +60 °C 3RH2 - -
RS Stock No. 122-9424
Mfr. Part No.3RH2911-2FA22
BrandSiemens
$20.55
Each
units
4 2NO/2NC Sirius Innovation Snap-On 10 A 690 V DP Cage Clamp -25°C +60°C -25 → +60 °C 3RH2 - -
RS Stock No. 246-5061
Mfr. Part No.3RV1901-1A
BrandSiemens
$45.07
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. 706-1894
Mfr. Part No.3RV2901-1D
BrandSiemens
$13.97
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. 521-4579
Mfr. Part No.5ST3010
BrandSiemens
$46.69
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. 392-8973
Mfr. Part No.3RH1921-1CA01
BrandSiemens
$6.21
Each
units
1 NC Sirius Classic Snap-On - - SP Screw - - - 3RH1 - -
RS Stock No. 706-1888
Mfr. Part No.3RV2901-1A
BrandSiemens
$16.95
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. 392-8967
Mfr. Part No.3RH1921-1CA10
BrandSiemens
$21.24
Each
units
1 NO Sirius Classic Snap-On - - SP Screw - - - 3RH1 - -
RS Stock No. 746-0715
Mfr. Part No.3RH1921-1LA20
BrandSiemens
$17.80
Each
units
2 2NO Sirius Classic Snap Front - - DP Screw - - - 3RH1 - -
RS Stock No. 392-7598
Mfr. Part No.3RH1921-2FA22
BrandSiemens
$18.55
Each
units
4 2NO/2NC Sirius Classic Snap-On - - 4P Cage Clamp - - - 3RH1 - -
RS Stock No. 706-0945
Mfr. Part No.3RH2911-2FA04
BrandSiemens
$22.27
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. 746-0800
Mfr. Part No.3RH2921-1DA11
BrandSiemens
$18.45
Each
units
2 NO/NC Sirius Innovation Lateral 10 A 600 V dc, 690 V ac DP Screw - - -25 → +60 °C 3RH2 - -
RS Stock No. 314-286
Mfr. Part No.3TX4010-2A
BrandSiemens
$12.26
Each
units
1 NO - Plug In 6 A - SP - - - - 3TX4 - -