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.

The auxiliary component is typically available in a variety of mounting styles such as front mount or DIN rail mount and a range of terminal types including screw terminals and cage clamps making it easy to find the right contact for the application.

What are auxiliary contacts used for?

One common usage of auxiliary contacts is in push-button controllers, where they can be built into the start button. They are a common component in relay logic circuits solid-state electronics, electric motors, motor control schemes and other industrial control applications.


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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 Width
RS Stock No. 608-7889
Mfr. Part No.GS1AN22
£65.00
Each
Units
4 2NO/2NC - Front Mount, Side Mount 1.25 kA - 4P - - - - - GS1A -
RS Stock No. 706-0854
Mfr. Part No.3RH2911-1AA10
BrandSiemens
£4.72
Each
Units
1 1NO Sirius Innovation Snap-On 6 A dc, 10 A ac 250 V dc, 690 V ac SPST Screw -25°C +60°C -25 → +60 °C - 3RH2 -
RS Stock No. 685-1508
Mfr. Part No.BFX1031
BrandLovato
£15.88
Each
Units
4 3NO/1NC - Snap-On - - - Screw - - - - - -
RS Stock No. 608-9009
Mfr. Part No.LA1LC025
£147.00
Each
Units
4 3NO/1NC - Side Mount - - 4P Screw - - - - LA1L -
RS Stock No. 512-9500
Mfr. Part No.OA4B01 1SCA022276R9210
BrandABB
£12.65
Each
Units
1 1NC - Snap-On - - SP - - - - - - -
RS Stock No. 363-5766
Mfr. Part No.LA1KN223
£13.60
Each
Units
4 2NO/2NC - Clip On 10 A 600 V ac 4P Cage Clamp - - - - LA1K -
RS Stock No. 791-2859
Mfr. Part No.A9C15915
£47.50
Each
Units
- - Acti 9 DIN Rail Mount - 24 → 130 V dc, 24 → 240 V ac - Screw -5°C +50°C -5 → +50 °C - iACT -
RS Stock No. 609-4398
Mfr. Part No.VZN11
£9.07
Each
Units
- - - Side Mount 16 A - - - - - - - VZN1 -
RS Stock No. 818-306
Mfr. Part No.072898 & AGM2-10-PKZ0
BrandEaton
£18.12
Each
Units
2 2NO - Side Mount 2 A dc, 3.5 A ac 220 V dc, 500 V ac DPST Screw - - - - - -
RS Stock No. 743-4992
Mfr. Part No.101371 & DILM32-XHI11-S
BrandEaton
£15.51
Each
Units
2 1NO/1NC - Side Mount 4 A ac, 10 A dc 220 V dc, 500 V ac DP Screw -25°C +60°C -25 → +60 °C - DILM -
RS Stock No. 445-0443
Mfr. Part No.1SAM201902R1002 HK1-20
BrandABB
£10.26
Each
Units
2 2NO - Side Mount 2 A dc, 6 A ac 220 V dc, 400 V ac DP - - - - - HK1 -
RS Stock No. 326-712
Mfr. Part No.010224 & 11DILE
BrandEaton
£8.30
Each
Units
2 1NO/1NC - Front Mount 2.5 A dc, 4 A ac 220 V dc, 500 V ac DPST Screw - - - - - -
RS Stock No. 513-4372
Mfr. Part No.283463 & DILM150-XHIA11
BrandEaton
£7.10
Each
Units
2 1NO/1NC - Front Mount 4 A ac, 10 A dc 220 V dc, 500 V ac DPST Screw -25°C +60°C -25 → +60 °C - DILM -
RS Stock No. 502-240
Mfr. Part No.100-KFA40E
£11.90
Each
Units
4 4NO - Snap-On - - 4PST Screw - - - - 100K -
RS Stock No. 124-3131
Mfr. Part No.5ST3030
BrandSiemens
£39.45
Each
Units
- - Sentron - - - - - - - - - 5ST3 -
RS Stock No. 122-1058
Mfr. Part No.BFB-22 EN
BrandWEG
£10.74
Each
Units
4 2NO/2NC - Front Mount 10 A 690 V ac 4PST Screw - - -25 → +55 °C - BFB -
RS Stock No. 243-7454
Mfr. Part No.3RH1911-1AA10
BrandSiemens
£3.99
Each
Units
1 1NO Sirius Classic Snap-On 6 A - SP Screw - - - - 3RH1 -
RS Stock No. 189-3881
Mfr. Part No.010304 & 40DILE
BrandEaton
£14.28
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. 257-3695
Mfr. Part No.VZ0
£9.37
Each
Units
1 - - Side Mount 20 A 690 V ac SP Screw -20°C +50°C -20 → +50 °C - VZ0 -