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. 711-6329
Mfr. Part No.1SBN010110R1001
BrandABB
£4.36
Each
Units
1 NC - Front Mount 6 A 600 V dc, 690 V ac SP Screw - - - - CA4 -
RS Stock No. 394-9920
Mfr. Part No.LADN13
£16.51
Each
Units
4 NO/3NC - Front Mount - - 4P Screw - - - - LADN -
RS Stock No. 608-9138
Mfr. Part No.LADC22
£18.47
Each
Units
4 2NO/2NC - Front Mount - - 4P Screw - - - - LADC -
RS Stock No. 711-6310
Mfr. Part No.1SBN010120R1011
BrandABB
£9.90
Each
Units
2 NO/NC - Side Mount 6 A 600 V dc, 690 V ac DP Screw -40°C +70°C -40 +70 °C - CAL4-11 -
RS Stock No. 685-1504
Mfr. Part No.BFX1011
BrandLovato
£7.72
Each
Units
2 NO/NC - Snap-On - - - Screw - - - - - -
RS Stock No. 776-2957
Mfr. Part No.A9N26924
£31.15
Each
Units
1 CO Acti 9 DIN Rail Mount 6 A ac, 6 A dc 130 V dc, 415 V ac SPDT Clamp -35°C +70°C -35 +70 °C - iC60 -
RS Stock No. 279-6337
Mfr. Part No.LA1KN31
£12.20
Each
Units
4 3NO/NC - Clip On 10 A 600 V ac 4P Screw - - - - LA1K -
RS Stock No. 445-8043
Mfr. Part No.1SBN010040R1122 - CA5-22M
BrandABB
£27.33
Each
Units
4 2NO/2NC - Front Mount 6 A 24 V dc, 230 V ac 4P Screw - - - - CA5 -
RS Stock No. 395-0172
Mfr. Part No.GVAD0110
£14.37
Each
Units
2 NO/NC - Side Mount - 240 V dc, 690 V ac DP Screw - - - - GVAD -
RS Stock No. 493-0624
Mfr. Part No.DILM32-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. 395-0138
Mfr. Part No.GVAE20
£8.54
Each
Units
2 2NO - Front Mount - 60 V dc, 240 V ac DP Screw - - - - GVAE -
RS Stock No. 922-7210
Mfr. Part No.FAZ-XHIN11
BrandEaton
£16.30
Each
Units
2 NO/NC - DIN Rail Mount 3 A ac, 500 mA dc 120 V dc, 240 V ac SPDT Screw - - - - FAZ -
RS Stock No. 272-870
Mfr. Part No.GVAED011
£12.39
Each
Units
2 NO/NC - Front Mount - - DP - - - - - GVAE -
RS Stock No. 246-5061
Mfr. Part No.3RV1901-1A
BrandSiemens
£8.24
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. 493-9110
£9.73
Each
Units
2 NO/NC TeSys U Series - 5 A 24 → 250 V ac/dc - - - - - - - -
RS Stock No. 455-5829
Mfr. Part No.GHS2701916R0001 - S2-H11
BrandABB
£16.38
Each
Units
2 NO/NC - Side Mount 4 A dc, 6 A ac 24 V dc, 230 V ac DP - - - - - HSMS -
RS Stock No. 776-2948
Mfr. Part No.A9N26923
£75.00
Each
Units
- - Acti 9 - - - - - - - - - iC60 -
RS Stock No. 395-0627
Mfr. Part No.GVAE1
£5.59
Each
Units
2 NO/NC - Front Mount - 60 V dc, 240 V ac DP Screw - - - - GVAE -
RS Stock No. 326-734
Mfr. Part No.22DILE
BrandEaton
£13.16
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. 257-3774
Mfr. Part No.VZ12
£20.01
Each
Units
- - - Side Mount 63 A - - - - - - - VZ12 -
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