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. 482-4434
Mfr. Part No.1SCA022353R4970
BrandABB
TWD352.00
Each
units
1 NO - - - - - - - - - - - -
RS Stock No. 735-2715
Mfr. Part No.3SB1400-0A
BrandSiemens
TWD363.00
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. 818-277
Mfr. Part No.NHI11-PKZ0
BrandEaton
TWD355.00
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. 246-5055
Mfr. Part No.3RV1901-1E
BrandSiemens
TWD314.00
Each
units
2 NO/NC Sirius Classic Front Mount - - DP Screw - - - 3RV1 - -
RS Stock No. 373-2255
Mfr. Part No.YM-150
TWD351.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 608-8775
Mfr. Part No.GV7AC01
TWD1,650.00
Each
units
- - - - - - - - - - - GV7A - -
RS Stock No. 243-7511
Mfr. Part No.3RH1911-1FA20
BrandSiemens
TWD242.00
Each
units
2 2NO Sirius Classic Snap-On 6 A - DP Screw - - - 3RH1 - -
RS Stock No. 394-9914
Mfr. Part No.LADN20
TWD355.00
Each
units
2 2NO TeSys Front Mount 10 A - DP Screw - - - LADN - -
RS Stock No. 373-2277
Mfr. Part No.YM-200
TWD416.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 772-1228
Mfr. Part No.5SW3300
BrandSiemens
TWD960.00
Each
units
2 NO/NC Sentron DIN Rail Mount 6 A 230 V ac - - - - - 5SW3 - -
RS Stock No. 333-546
Mfr. Part No.HI11-P1/P3-Z/SOND
BrandEaton
TWD345.00
Each
units
- NO/NC - - 10 A - - Screw - - - - - -
RS Stock No. 400-1473
Mfr. Part No.LAD8N20
TWD373.00
Each
units
- 2NO - Side - - - Screw Clamp - - - LAD8 - -
RS Stock No. 706-0911
Mfr. Part No.3RH2911-1HA20
BrandSiemens
TWD255.00
Each
units
2 2NO Sirius Innovation Snap-On 6 A ac, 10 A dc 250 V dc, 690 V ac DPST Screw -25°C +60°C -25 → +60 °C 3RH2 - -
RS Stock No. 124-3131
Mfr. Part No.5ST3030
BrandSiemens
TWD1,215.00
Each
units
- - Sentron - - - - - - - - 5ST3 - -
RS Stock No. 373-2261
Mfr. Part No.YM-180
TWD349.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 373-2233
Mfr. Part No.YM-100
TWD231.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 373-2227
Mfr. Part No.YM-80
TWD196.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 394-9879
Mfr. Part No.LADN40
TWD596.00
Each
units
4 4NO TeSys Front Mount 10 A - 4P Screw - - - LADN - -
RS Stock No. 244-0107
Mfr. Part No.NHI-E-11-PKZ0
BrandEaton
TWD393.00
Each
units
2 NO/NC - Front Mount 1 A ac, 2 A dc 24 V dc, 240 V ac DPST Screw - - - - - -
RS Stock No. 373-2211
Mfr. Part No.YM-50
TWD137.00
Each
units
- - - - - - - - - - - YM - 50 x 45 x 30mm