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. 392-8967
Mfr. Part No.3RH1921-1CA10
BrandSiemens
PHP295.37
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1 NO Sirius Classic Snap-On - - SP Screw - - - 3RH1 - -
RS Stock No. 706-1894
Mfr. Part No.3RV2901-1D
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PHP656.64
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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. 521-4585
Mfr. Part No.5ST3011
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PHP1,996.50
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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. 521-4579
Mfr. Part No.5ST3010
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PHP1,458.78
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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. 314-292
Mfr. Part No.3TX4001-2A
BrandSiemens
PHP427.83
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1 NC - Plug In 6 A - SP - - - - 3TX4 - -
RS Stock No. 706-1888
Mfr. Part No.3RV2901-1A
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PHP794.44
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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. 392-8973
Mfr. Part No.3RH1921-1CA01
BrandSiemens
PHP366.29
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1 NC Sirius Classic Snap-On - - SP Screw - - - 3RH1 - -
RS Stock No. 521-4591
Mfr. Part No.5ST3012
BrandSiemens
PHP1,900.34
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2 2NC Sentron DIN Rail Mount 6 A 230 V ac DP Screw -5°C +40°C -5 → +40 °C 5ST3 - -
RS Stock No. 746-0796
Mfr. Part No.3RH2911-1GA22
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PHP1,089.70
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4 2NO/2NC Sirius Innovation Snap Front 10 A 600 V dc, 690 V ac 4P Screw - - -25 → +60 °C 3RH2 - -
RS Stock No. 243-7448
Mfr. Part No.3RH1911-1AA01
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PHP285.75
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1 NC Sirius Classic Snap-On 6 A - SP Screw - - - 3RH1 - -
RS Stock No. 706-0891
Mfr. Part No.3RH2911-1FC22
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PHP1,739.46
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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. 706-0879
Mfr. Part No.3RH2911-1DA11
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PHP994.13
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2 NO/NC Sirius Innovation Snap-On 10 A 250 V dc, 690 V ac DPST Screw -25°C +60°C -25 → +60 °C - - -
RS Stock No. 706-0854
Mfr. Part No.3RH2911-1AA10
BrandSiemens
PHP322.17
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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. 706-0863
Mfr. Part No.3RH2911-1BA01
BrandSiemens
PHP526.58
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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. 706-0888
Mfr. Part No.3RH2911-1FB11
BrandSiemens
PHP803.32
Each
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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. 124-3133
Mfr. Part No.5ST3040
BrandSiemens
PHP6,156.25
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- - Sentron - - - - - - - - 5ST3 - -
RS Stock No. 706-0860
Mfr. Part No.3RH2911-1DA02
BrandSiemens
PHP995.10
Each
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2 2NC Sirius Innovation Snap-On 10 A 250 V dc, 690 V ac DPST Screw -25°C +60°C -25 → +60 °C - - -
RS Stock No. 706-0920
Mfr. Part No.3RH2911-1HA21
BrandSiemens
PHP558.89
Each
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3 2NO/NC Sirius Innovation Snap-On 6 A ac, 10 A dc 250 V dc, 690 V ac 3PST Screw -25°C +60°C -25 → +60 °C - - -
RS Stock No. 706-0872
Mfr. Part No.3RH2911-1DA20
BrandSiemens
PHP995.10
Each
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2 2NO Sirius Innovation Snap-On 10 A 250 V dc, 690 V ac DPST Screw -25°C +60°C -25 → +60 °C - - -
RS Stock No. 751-5916
Mfr. Part No.3RT1966-4G
BrandSiemens
PHP5,060.17
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- - Sirius Classic - - - - - - - - 3RT1 - -