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 Priced to Clear Series External Dimensions
RS Stock No. 513-0184
Mfr. Part No.DILM150-XHI11
BrandEaton
£6.38
Each
Units
2 NO/NC - Front Mount 4 A ac, 10 A dc 220 V dc, 500 V ac DPST Screw - - - - DILM -
RS Stock No. 711-6317
Mfr. Part No.1SBN010110R1010
BrandABB
£4.36
Each
Units
1 NO - Front Mount 6 A 600 V dc, 690 V ac SP Screw - - - - CA4 -
RS Stock No. 759-011
Mfr. Part No.LA1KN20
£7.06
Each
Units
2 2NO - Clip On 10 A 600 V ac DP Screw - - - - LA1K -
RS Stock No. 238-1121
Mfr. Part No.100-SB11
£9.56
Each
Units
2 NC, NO - Side Mount 10 A - SPST Screw - - - - 100S -
RS Stock No. 395-0100
Mfr. Part No.GVAN20
£8.72
Each
Units
2 2NO - Side Mount - 240 V dc, 690 V ac DP Screw - - - - GVAN -
RS Stock No. 223-4817
Mfr. Part No.39990701
BrandSocomec
£5.95
Each
Units
1 NO - - 2.8 A dc, 3 A ac 400 V ac, 48 V dc SP - - - - - - -
RS Stock No. 445-0421
Mfr. Part No.1SAM201902R1001
BrandABB
£9.89
Each
Units
2 NO/NC - Side Mount 2 A dc, 6 A ac 220 V dc, 400 V ac DP - - - - - HK1 -
RS Stock No. 456-0253
Mfr. Part No.1SBN010020R1011
BrandABB
£13.13
Each
Units
2 NO/NC - Side Mount - - DP Screw - - - - CAL5 -
RS Stock No. 326-633
Mfr. Part No.22DILEM
BrandEaton
£12.92
Each
Units
4 2NO/2NC - Front Mount 2.5 A dc, 4 A ac 220 V dc, 500 V ac 4PST Screw - - - - - -
RS Stock No. 818-283
Mfr. Part No.NHI21-PKZ0
BrandEaton
£16.31
Each
Units
3 2NO/NC - Side Mount 2 A dc, 3.5 A ac 220 V dc, 500 V ac 3PST Screw - - - - - -
RS Stock No. 314-292
Mfr. Part No.3TX4001-2A
BrandSiemens
£5.39
Each
Units
1 NC - Plug In 6 A - SP - - - - - 3TX4 -
RS Stock No. 492-1692
Mfr. Part No.NHI-E-10-PKZ0
BrandEaton
£7.72
Each
Units
1 NO - Front Mount 1 A ac, 2 A dc 110 V dc, 240 V ac SPST Screw - - - - - -
RS Stock No. 395-0150
Mfr. Part No.GVAD1010
£14.37
Each
Units
2 2NO - Side Mount - 240 V dc, 690 V ac DP Screw - - - - GVAD -
RS Stock No. 238-1086
Mfr. Part No.100-FA31
£18.90
Each
Units
4 3NO/NC - Front Mount 10 A - 4PST Screw - - - - 100F -
RS Stock No. 394-9964
Mfr. Part No.LADN04
£16.51
Each
Units
4 4NC - Front Mount - - 4P Screw - - - - LADN -
RS Stock No. 502-171
Mfr. Part No.100-KFC11
£5.92
Each
Units
2 NO/NC - Snap-On 12 A - DPST Screw - - - - 100K -
RS Stock No. 706-1888
Mfr. Part No.3RV2901-1A
BrandSiemens
£7.49
Each
Units
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. 187-908
Mfr. Part No.LADN11G
£9.14
Each
Units
2 NO/NC - Front Mount 10 A 690 V ac DP Screw -5°C +60°C -5 → +60 °C - LADN -
RS Stock No. 422-9299
Mfr. Part No.194E-A-P11
£8.54
Each
Units
2 NO/NC - Side Mount 6 A 17 V dc DP - -20°C +55°C -20 +55 °C - 194 -
RS Stock No. 521-4585
Mfr. Part No.5ST3011
BrandSiemens
£24.42
Each
Units
2 2NO Sentron DIN Rail Mount 6 A 230 V ac DP Screw -5°C +40°C -5 +40 °C - 5ST3 -
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