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. 610-3537
Mfr. Part No.3LD9200-5C
BrandSiemens
£9.21
Each
Units
2 NO/NC - Floor - - DP - - - - - - -
RS Stock No. 813-9415
Mfr. Part No.LADN226
£18.15
Each
Units
8 2NO/2NC - Front Mount 10 A 690 V ac 4P Lug Ring -40°C +70°C -40 → +70 °C - - -
RS Stock No. 493-0696
Mfr. Part No.DILA-XHI40
BrandEaton
£10.78
Each
Units
4 4NO - Front Mount 4 A ac, 10 A dc 220 V dc, 500 V ac 4PST Screw - - - - DILA -
RS Stock No. 209-5785
Mfr. Part No.M5735204
BrandMETCASE
£88.31
Each
Units
- - - - - - - - - - - - Mettec 350 x 250 x 120mm
RS Stock No. 711-6360
Mfr. Part No.CA4-22M
BrandABB
£15.59
Each
Units
4 2NO/2NC - Front Mount 6 A 600 V dc, 690 V ac 4P Screw -40°C +70°C -40 → +70 °C - CA4 -
RS Stock No. 711-6339
Mfr. Part No.CAT4-11E
BrandABB
£9.41
Each
Units
2 NO/NC - Front Mount 6 A 600 V dc, 690 V ac DP Screw - - - - CAT4 -
RS Stock No. 776-2963
Mfr. Part No.A9N26929
£46.27
Each
Units
2 CO Acti 9 DIN Rail Mount 6 A ac, 6 A dc 130 V dc, 415 V ac DPDT Clamp -37°C +70°C -37 +70 °C - iC60 -
RS Stock No. 243-9949
Mfr. Part No.GAC5
£31.00
1 Bag of 10
Bag(s)
- - - - - - - - - - - - GAC5 -
RS Stock No. 874-4534
Mfr. Part No.3VA9988-0AA11
BrandSiemens
£19.79
Each
Units
6 4NO/2NC Sentron Side Mount 10 A - - Screw - - - - 3VA -
RS Stock No. 685-1508
Mfr. Part No.BFX1031
BrandLovato
£15.12
Each
Units
4 3NO/NC - Snap-On - - - Screw - - - - - -
RS Stock No. 706-0854
Mfr. Part No.3RH2911-1AA10
BrandSiemens
£4.60
Each
Units
1 NO 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. 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. 608-9009
Mfr. Part No.LA1LC025
£147.00
Each
Units
4 2NO/2NC, 3NO/NC - Side Mount - - 4P Screw - - - - LA1L -
RS Stock No. 246-4513
Mfr. Part No.3RH1921-1FA04
BrandSiemens
£8.48
Each
Units
4 4NC Sirius Classic Front Mount 6 A - 4P Screw - - - - 3RH1 -
RS Stock No. 512-9500
Mfr. Part No.OA4B01
BrandABB
£12.05
Each
Units
1 NC - Snap-On - - SP - - - - - - -
RS Stock No. 791-2859
Mfr. Part No.A9C15915
£46.00
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. 363-5766
Mfr. Part No.LA1KN223
£13.40
Each
Units
4 2NO/2NC - Clip On 10 A 600 V ac 4P Cage Clamp - - - - LA1K -
RS Stock No. 609-4398
Mfr. Part No.VZN11
£8.94
Each
Units
- - - Side Mount 16 A - - - - - - - VZN1 -
RS Stock No. 326-712
Mfr. Part No.11DILE
BrandEaton
£7.64
Each
Units
2 NO/NC - Front Mount 2.5 A dc, 4 A ac 220 V dc, 500 V ac DPST Screw - - - - - -
RS Stock No. 445-0443
Mfr. Part No.1SAM201902R1002
BrandABB
£9.44
Each
Units
2 2NO - Side Mount 2 A dc, 6 A ac 220 V dc, 400 V ac DP - - - - - HK1 -
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