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. 331-3696
BrandRS PRO
PHP639.84
Each
units
2 NO/NC - DIN Rail Mount - 240 V ac DP - - - - - - -
RS Stock No. 121-6871
BrandRS PRO
PHP675.43
Each
units
- - - DIN Rail Mount - - - Screw -25°C +60°C -25 → +60 °C AR - -
RS Stock No. 121-6865
BrandRS PRO
PHP246.71
Each
units
1 NO - DIN Rail Mount - - - Screw -25°C +60°C -25 → +60 °C HSV - -
RS Stock No. 121-6874
BrandRS PRO
PHP140.69
Each
units
- - - DIN Rail Mount - - - Screw -25°C +60°C -25 → +60 °C MSK - -
RS Stock No. 121-6866
BrandRS PRO
PHP246.71
Each
units
1 NC - DIN Rail Mount - - - Screw -25°C +60°C -25 → +60 °C HSV - -
RS Stock No. 121-6869
BrandRS PRO
PHP675.43
Each
units
- - - DIN Rail Mount - - - Screw -25°C +60°C -25 → +60 °C UR - -
RS Stock No. 121-6872
BrandRS PRO
PHP675.43
Each
units
- - - DIN Rail Mount - - - Screw -25°C +60°C -25 → +60 °C AR - -
RS Stock No. 121-6870
BrandRS PRO
PHP675.43
Each
units
- - - DIN Rail Mount - - - Screw -25°C +60°C -25 → +60 °C UR - -
RS Stock No. 121-6867
BrandRS PRO
PHP283.52
Each
units
1 NO - DIN Rail Mount - - - Screw -25°C +60°C -25 → +60 °C HRS - -
RS Stock No. 121-6875
BrandRS PRO
PHP187.26
Each
units
- - - DIN Rail Mount - - - Screw -25°C +60°C -25 → +60 °C MSK - -
RS Stock No. 121-6873
BrandRS PRO
PHP130.97
Each
units
- - - DIN Rail Mount - - - Screw -25°C +60°C -25 → +60 °C MSK - -
RS Stock No. 466-295
BrandRS PRO
PHP222.00
Each
units
1 NO/NC - Panel Mount 63 A - SPDT - - - - - - -
RS Stock No. 121-6868
BrandRS PRO
PHP275.83
Each
units
1 NC - DIN Rail Mount - - - Screw -25°C +60°C -25 → +60 °C HRS - -
RS Stock No. 394-9908
Mfr. Part No.LADN22
PHP996.97
Each
units
4 2NO/2NC TeSys Front Mount 10 A 600 V ac 4P Screw -5°C +60°C - LADN - -
RS Stock No. 395-0144
Mfr. Part No.GVAE11
PHP472.39
Each
units
2 NO/NC TeSys Front Mount 2.5 A 60 V dc, 240 V ac DP Screw - - - GVAE - -
RS Stock No. 395-0122
Mfr. Part No.GVAN11
PHP568.25
Each
units
2 NO/NC TeSys Side Mount 6 A 240 V dc, 690 V ac DP Screw - - - GVAN - -
RS Stock No. 791-2824
Mfr. Part No.A9A26924
PHP1,642.74
Each
units
1 NO/NC Acti 9 DIN Rail Mount 2 A dc, 6 A ac 24 → 130 V dc, 240 → 415 V ac SPCO Screw -35°C +70°C -35 → +70 °C iOF - -
RS Stock No. 246-5061
Mfr. Part No.3RV1901-1A
BrandSiemens
PHP573.51
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
PHP258.66
Each
units
1 NO Sirius Classic Snap-On - - SP Screw - - - 3RH1 - -
RS Stock No. 493-0680
Mfr. Part No.DILA-XHI22
BrandEaton
PHP688.78
Each
units
4 2NO/2NC - Front Mount 4 A ac, 10 A dc 220 V dc, 500 V ac 4PST Screw - - - DILA - -
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One block can be fitted to each side of the deviceFor signalling the ’ON’ or ’OFF’ switch positionsWith 1 NO + 1NC contactsRated voltage 240Vac.