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. 743-4992
Mfr. Part No.DILM32-XHI11-S
BrandEaton
£14.34
Each
Units
2 NO/NC - Side Mount 4 A ac, 10 A dc 220 V dc, 500 V ac DP Screw - - - - DILM -
RS Stock No. 513-4372
Mfr. Part No.DILM150-XHIA11
BrandEaton
£6.57
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. 124-3131
Mfr. Part No.5ST3030
BrandSiemens
£38.41
Each
Units
- - Sentron - - - - - - - - - 5ST3 -
RS Stock No. 502-240
Mfr. Part No.100-KFA40E
£11.90
Each
Units
4 4NO - Snap-On - - 4PST Screw - - - - 100K -
RS Stock No. 122-1058
Mfr. Part No.BFB-22 EN
BrandWEG
£10.23
Each
Units
4 2NO/2NC - Front Mount 10 A 690 V ac 4PST Screw - - -25 → +55 °C - BFB -
RS Stock No. 257-3695
Mfr. Part No.VZ0
£9.23
Each
Units
1 - - Side Mount 20 A 690 V ac SP Screw -20°C +50°C -20 → +50 °C - VZ0 -
RS Stock No. 243-7454
Mfr. Part No.3RH1911-1AA10
BrandSiemens
£4.08
Each
Units
1 NO Sirius Classic Snap-On 6 A - SP Screw - - - - 3RH1 -
RS Stock No. 189-3881
Mfr. Part No.40DILE
BrandEaton
£13.55
Each
Units
4 4NO - Front Mount 2.5 A dc, 4 A ac 220 V dc, 500 V ac 4PST Screw - - - - - -
RS Stock No. 610-0140
Mfr. Part No.VZ15
£17.78
Each
Units
- - - Side Mount 63 A - - - - - - - VZ15 -
RS Stock No. 187-891
Mfr. Part No.LADN01
£9.10
Each
Units
1 NC - Front Mount 10 A 690 V ac SP Screw -5°C +60°C -5 → +60 °C - LADN -
RS Stock No. 746-0800
Mfr. Part No.3RH2921-1DA11
BrandSiemens
£8.84
Each
Units
2 NO/NC Sirius Innovation Lateral 10 A 600 V dc, 690 V ac DP Screw - - -25 → +60 °C - 3RH2 -
RS Stock No. 373-2211
Mfr. Part No.YM-50
£3.96
Each
Units
- - - - - - - - - - - - YM 50 x 45 x 30mm
RS Stock No. 262-0971
Mfr. Part No.LA1SK20
£9.11
Each
Units
2 2NO - Clip On - - DP Screw - - - - LA1S -
RS Stock No. 608-8999
Mfr. Part No.LA1LC012
£164.00
Each
Units
5 4NO/NC - Side Mount - - 5P Screw - - - - LA1L -
RS Stock No. 874-4537
Mfr. Part No.3VA9988-0AA12
BrandSiemens
£13.18
Each
Units
3 4NO/2NC Sentron Side Mount 6 A - - Screw - - - - 3VA -
RS Stock No. 502-177
Mfr. Part No.100-KFC02
£6.04
Each
Units
2 2NC - Snap-On 12 A - DPST Screw - - - - 100K -
RS Stock No. 513-0207
Mfr. Part No.DILM150-XHI40
BrandEaton
£11.10
Each
Units
4 4NO - Front Mount 4 A ac, 10 A dc 220 V dc, 500 V ac 4PST Screw - - - - DILM -
RS Stock No. 706-0911
Mfr. Part No.3RH2911-1HA20
BrandSiemens
£5.87
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. 257-3702
Mfr. Part No.VZ1
£9.92
Each
Units
1 - - Side Mount 25 A 690 V ac SP Screw -20°C +50°C -20 → +50 °C - VZ1 -
RS Stock No. 209-6463
Mfr. Part No.M5735104
BrandMETCASE
£82.46
Each
Units
- - - - - - - - - - - - Mettec 350 x 250 x 85mm
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