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. 122-0780
Mfr. Part No.ACBF-11
BrandWEG
£6.61
Each
Units
2 NO/NC - Front Mount 2.5 A 250 V ac DPST Screw - - -20 → +70 °C - ACBF -
RS Stock No. 711-6354
Mfr. Part No.CA4-22E
BrandABB
£15.59
Each
Units
4 2NO/2NC - Front Mount 6 A 600 V dc, 690 V ac 4P Screw - - - - CA4 -
RS Stock No. 422-9283
Mfr. Part No.194E-E-P11
£8.54
Each
Units
2 NO/NC - Side Mount 10 A 8 V dc DP - -20°C +55°C -20 +55 °C - 194 -
RS Stock No. 392-8995
Mfr. Part No.3RH1921-2CA01
BrandSiemens
£4.40
Each
Units
1 NC Sirius Classic Snap-On - - SP Cage Clamp - - - - 3RH1 -
RS Stock No. 351-5577
Mfr. Part No.140M-C-AFA20
£7.07
Each
Units
2 2NO - Front Mount - - DPST Screw - - - - 140 -
RS Stock No. 521-4591
Mfr. Part No.5ST3012
BrandSiemens
£24.42
Each
Units
2 2NC Sentron DIN Rail Mount 6 A 230 V ac DP Screw -5°C +40°C -5 +40 °C - 5ST3 -
RS Stock No. 238-1115
Mfr. Part No.100-SB10
£5.96
Each
Units
1 NO - Side Mount 10 A - SPST Screw - - - - 100S -
RS Stock No. 238-1092
Mfr. Part No.100-FA40
£18.90
Each
Units
4 4NO - Front Mount 10 A - 4PST Screw - - - - 100F -
RS Stock No. 279-6315
Mfr. Part No.LA1KN04
£12.18
Each
Units
4 4NC - Clip On 10 A 600 V ac 4P Screw - - - - LA1K -
RS Stock No. 445-0415
Mfr. Part No.1SAM201901R1001
BrandABB
£9.44
Each
Units
2 NO/NC - Front Mount 1 A dc, 3 A ac 220 V dc, 230 V ac DP - - - - - HK1 -
RS Stock No. 806-7382
Mfr. Part No.A9A15096
£11.42
Each
Units
1 NC Acti 9 - 6 A 415 V ac 1P - - - - - iSW -
RS Stock No. 187-560
Mfr. Part No.VZN05
£7.00
Each
Units
1 NO - - - - SP - - - - - VZN0 -
RS Stock No. 351-5549
Mfr. Part No.140M-C-AFA10
£5.73
Each
Units
1 NO - Front Mount - - SPST Screw - - - - 140 -
RS Stock No. 685-1517
Mfr. Part No.BFX1022
BrandLovato
£15.12
Each
Units
4 2NO/2NC - Snap-On - - - Screw - - - - - -
RS Stock No. 706-0891
Mfr. Part No.3RH2911-1FC22
BrandSiemens
£15.78
Each
Units
4 2NO/2NC Sirius Innovation Snap-On 6 A dc, 10 A ac 250 V dc, 690 V ac 4PST Screw -25°C +60°C -25 +60 °C - 3RH2 -
RS Stock No. 493-0668
Mfr. Part No.DILA-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 - - - - DILA -
RS Stock No. 395-0188
Mfr. Part No.GVAD0101
£14.56
Each
Units
2 2NC - Side Mount - 240 V dc, 690 V ac DP Screw - - - - GVAD -
RS Stock No. 351-5612
Mfr. Part No.140M-C-AFAR10A10
£10.80
Each
Units
2 NO/NC - Front Mount - - DPST Screw - - - - 140 -
RS Stock No. 467-5490
Mfr. Part No.1SDA051370R1
BrandABB
£52.21
Each
Units
1 NO/NC - - - - SPDT - - - - - TMAX -
RS Stock No. 238-1036
Mfr. Part No.100-FA20
£9.56
Each
Units
2 2NO - Front Mount 10 A - DPST Screw - - - - 100F -
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