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. 121-6875
BrandRS PRO
MYR18.14
Each
units
- - - DIN Rail Mount - - - Screw -25°C +60°C -25 +60 °C MSK - -
RS Stock No. 121-6865
BrandRS PRO
MYR23.43
Each
units
1 NO - DIN Rail Mount - - - Screw -25°C +60°C -25 +60 °C HSV - -
RS Stock No. 121-6869
BrandRS PRO
MYR64.44
Each
units
- - - DIN Rail Mount - - - Screw -25°C +60°C -25 +60 °C UR - -
RS Stock No. 331-3696
BrandRS PRO
MYR33.67
Each
units
2 NO/NC - DIN Rail Mount - 240 V ac DP - - - - - - -
RS Stock No. 121-6868
BrandRS PRO
MYR27.07
Each
units
1 NC - DIN Rail Mount - - - Screw -25°C +60°C -25 +60 °C HRS - -
RS Stock No. 466-295
BrandRS PRO
MYR21.23
Each
units
1 NO/NC - Panel Mount 63 A - SPDT - - - - - - -
RS Stock No. 121-6873
BrandRS PRO
MYR14.78
Each
units
- - - DIN Rail Mount - - - Screw -25°C +60°C -25 +60 °C MSK - -
RS Stock No. 121-6867
BrandRS PRO
MYR27.07
Each
units
1 NO - DIN Rail Mount - - - Screw -25°C +60°C -25 +60 °C HRS - -
RS Stock No. 121-6866
BrandRS PRO
MYR23.63
Each
units
1 NC - DIN Rail Mount - - - Screw -25°C +60°C -25 +60 °C HSV - -
RS Stock No. 121-6870
BrandRS PRO
MYR65.13
Each
units
- - - DIN Rail Mount - - - Screw -25°C +60°C -25 +60 °C UR - -
RS Stock No. 121-6874
BrandRS PRO
MYR14.16
Each
units
- - - DIN Rail Mount - - - Screw -25°C +60°C -25 +60 °C MSK - -
RS Stock No. 121-6872
BrandRS PRO
MYR81.78
Each
units
- - - DIN Rail Mount - - - Screw -25°C +60°C -25 → +60 °C AR - -
RS Stock No. 121-6871
BrandRS PRO
MYR64.44
Each
units
- - - DIN Rail Mount - - - Screw -25°C +60°C -25 +60 °C AR - -
RS Stock No. 394-9908
Mfr. Part No.LADN22
MYR68.91
Each
units
4 2NO/2NC TeSys Front Mount 10 A 600 V ac 4P Screw -5°C +60°C - LADN - -
RS Stock No. 746-0705
Mfr. Part No.3RH1921-1HA22
BrandSiemens
MYR65.84
Each
units
4 2NO/2NC Sirius Classic Snap Front - - 4P Screw - - - 3RH1 - -
RS Stock No. 394-9936
Mfr. Part No.LADN11
MYR53.85
Each
units
2 NO/NC TeSys Front Mount 10 A - DP Screw - - -5 +60 °C LADN - -
RS Stock No. 445-0415
Mfr. Part No.1SAM201901R1001
BrandABB
MYR57.77
Each
units
2 NO/NC - Front Mount 1 A dc, 3 A ac 220 V dc, 230 V ac DP - - - - HK1 - -
RS Stock No. 818-277
Mfr. Part No.072896 & NHI11-PKZ0
BrandEaton
MYR68.84
Each
units
2 NO/NC - Side Mount 2 A dc, 3.5 A ac 220 V dc, 500 V ac DPST Screw - - - - - -
RS Stock No. 314-292
Mfr. Part No.3TX4001-2A
BrandSiemens
MYR34.92
Each
units
1 NC - Plug In 6 A - SP - - - - 3TX4 - -
RS Stock No. 791-2824
Mfr. Part No.A9A26924
MYR204.84
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 - -