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. 122-0781
Mfr. Part No.ACBS-11
BrandWEG
£6.69
Each
Units
2 NO/NC - Side Mount 10 A 690 V ac DPST Screw - - -20 → +70 °C - ACBS -
RS Stock No. 122-0928
Mfr. Part No.BFC0-11
BrandWEG
£5.38
Each
Units
2 NO/NC - Front Mount 10 A 690 V ac DPST Screw - - -25 → +55 °C - BFC0 -
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. 122-1069
Mfr. Part No.BLB-11 EN
BrandWEG
£7.61
Each
Units
2 NO/NC - Side Mount 10 A 690 V ac DPST Screw - - -25 → +55 °C - BLB -
RS Stock No. 122-1054
Mfr. Part No.BFB-11 EN
BrandWEG
£6.01
Each
Units
2 NO/NC - Front Mount 10 A 690 V ac DPST Screw - - -25 → +55 °C - BFB -
RS Stock No. 122-0953
Mfr. Part No.BFCA-40
BrandWEG
£9.39
Each
Units
4 4NO - Front Mount 10 A 690 V ac 4PST Screw - - -25 → +55 °C Yes BFCA -
RS Stock No. 122-0784
Mfr. Part No.TSB
BrandWEG
£17.13
Each
Units
4 2NO/2NC - Side Mount 10 A 690 V ac 4PST Screw - - -20 → +70 °C - TSB -
RS Stock No. 122-0929
Mfr. Part No.BFC0-13
BrandWEG
£8.77
Each
Units
4 NO/3NC - Front Mount 10 A 690 V ac 4PST Screw - - -25 → +55 °C - BFC0 -
RS Stock No. 122-0946
Mfr. Part No.BFCA-02
BrandWEG
£5.38
Each
Units
2 2NC - Front Mount 10 A 690 V ac DPST Screw - - -25 → +55 °C - BFCA -
RS Stock No. 122-0936
Mfr. Part No.BFC0-31
BrandWEG
£8.77
Each
Units
4 3NO/NC - Front Mount 10 A 690 V ac 4PST Screw - - -25 → +55 °C - BFC0 -
RS Stock No. 122-0943
Mfr. Part No.BFC4-22
BrandWEG
£8.77
Each
Units
4 2NO/2NC - Front Mount 10 A 690 V ac 4PST Screw - - -25 → +55 °C - BFC4 -
RS Stock No. 122-0940
Mfr. Part No.BFC4-11
BrandWEG
£5.78
Each
Units
2 NO/NC - Front Mount 10 A 690 V ac DPST Screw - - -25 → +55 °C - BFC4 -
RS Stock No. 122-0947
Mfr. Part No.BFCA-04
BrandWEG
£8.77
Each
Units
4 4NC - Front Mount 10 A 690 V ac 4PST Screw - - -25 → +55 °C - BFCA -
RS Stock No. 122-0939
Mfr. Part No.BFC4-04
BrandWEG
£8.77
Each
Units
4 4NC - Front Mount 10 A 690 V ac 4PST Screw - - -25 → +55 °C - BFC4 -
RS Stock No. 122-0949
Mfr. Part No.BFCA-13
BrandWEG
£8.77
Each
Units
4 NO/3NC - Front Mount 10 A 690 V ac 4PST Screw - - -25 → +55 °C - BFCA -
RS Stock No. 122-0933
Mfr. Part No.BFC025-11
BrandWEG
£5.38
Each
Units
2 NO/NC - Front Mount 10 A 690 V ac DPST Screw - - -25 → +55 °C - BFC025 -
RS Stock No. 122-0926
Mfr. Part No.BFC0-02
BrandWEG
£5.38
Each
Units
2 2NC - Front Mount 10 A 690 V ac DPST Screw - - -25 → +55 °C - BFC0 -
RS Stock No. 122-1071
Mfr. Part No.BLB-02 EN
BrandWEG
£7.53
Each
Units
2 2NC - Side Mount 10 A 690 V ac DPST Screw - - -25 → +55 °C - BLB -
RS Stock No. 122-0944
Mfr. Part No.BFC4-31
BrandWEG
£8.67
Each
Units
4 3NO/NC - Front Mount 10 A 690 V ac 4PST Screw - - -25 → +55 °C - BFC4 -