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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Omschrijving Prijs 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 CAD Drawing Series External Width
RS-stocknr. 392-8967
Fabrikantnummer3RH1921-1CA10
FabrikantSiemens
4,69 €
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4 2NO/2NC Sirius Innovation Snap-On 10 A 600 V dc, 690 V ac 4P Screw - - -25 → +60 °C - 3RH2 -
RS-stocknr. 392-8973
Fabrikantnummer3RH1921-1CA01
FabrikantSiemens
4,69 €
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1 1NC Sirius Classic Snap-On - - SP Screw - - - - 3RH1 -
RS-stocknr. 706-1888
Fabrikantnummer3RV2901-1A
FabrikantSiemens
10,17 €
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2 1NO/1NC 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 -
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Fabrikantnummer3RH2911-1FA40
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14,49 €
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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-stocknr. 243-7454
Fabrikantnummer3RH1911-1AA10
FabrikantSiemens
4,60 €
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1 1NO Sirius Classic Snap-On 6 A - SP Screw - - - - 3RH1 -
RS-stocknr. 122-9427
Fabrikantnummer3RH2921-2DA11
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12,96 €
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2 1NO/1NC Sirius Innovation Snap-On 10 A 690 V SPST Cage Clamp -25°C +60°C -25 → +60 °C - 3RH29 -
RS-stocknr. 706-1891
Fabrikantnummer3RV2901-1F
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10,17 €
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2 2NO 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 - - -
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2 1NO/1NC Sirius Classic - 20 mA - - Screw -25°C +60°C -25 → +60 °C - 3RT1 -
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Fabrikantnummer3RV2901-1E
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2 1NO/1NC 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 -
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1 1NC - Plug In 6 A - SP - - - - - 3TX4 -
RS-stocknr. 521-4579
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2 1NO/1NC Sentron DIN Rail Mount 6 A 230 V ac DP Screw -5°C +40°C -5 → +40 °C - 5ST3 -
RS-stocknr. 246-4507
Fabrikantnummer3RH1921-1FA22
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10,96 €
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4 2NO/2NC - Front Mount 6 A - 4P Screw - - - - 3RH1 -
RS-stocknr. 706-0936
Fabrikantnummer3RH2911-1HA31
FabrikantSiemens
14,49 €
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4 3NO/1NC Sirius Innovation Snap-On 6 A ac, 10 A dc 250 V dc, 690 V ac 4PST Screw -25°C +60°C -25 → +60 °C - 3RH2 -
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Fabrikantnummer3VA9988-0AA12
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3 4NO/2NC Sentron Side Mount 6 A - - Screw - - - - 3VA -
RS-stocknr. 706-1894
Fabrikantnummer3RV2901-1D
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1 1CO 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-stocknr. 243-7448
Fabrikantnummer3RH1911-1AA01
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1 1NC Sirius Classic Snap-On 6 A - SP Screw - - - - 3RH1 -
RS-stocknr. 392-8951
Fabrikantnummer3RH1921-2CA10
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1 1NO Sirius Classic Snap-On - - SP Cage Clamp - - - - 3RH1 -
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2 1NO/1NC Sirius Innovation Lateral 10 A 600 V dc, 690 V ac DP Screw - - -25 → +60 °C - 3RH2 -
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6 4NO/2NC Sentron Side Mount 10 A - - Screw - - - - 3VA -