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 Series External Dimensions External Length
RS Stock No. 493-0696
Mfr. Part No.DILA-XHI40
BrandEaton
HK$104.50
Each
units
4 4NO - Front Mount 4 A ac, 10 A dc 220 V dc, 500 V ac 4PST Screw - - - DILA - -
RS Stock No. 122-1057
Mfr. Part No.BFB-31 EN
BrandWEG
HK$116.32
Each
units
4 3NO/NC - Front Mount 10 A 690 V ac 4PST Screw - - -25 → +55 °C BFB - -
RS Stock No. 122-0939
Mfr. Part No.BFC4-04
BrandWEG
HK$100.81
Each
units
4 4NC - Front Mount 10 A 690 V ac 4PST Screw - - -25 → +55 °C BFC4 - -
RS Stock No. 363-5788
Mfr. Part No.LA1KN043
HK$153.30
Each
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4 4NC - Clip On 10 A 600 V ac 4P Cage Clamp - - - LA1K - -
RS Stock No. 136-3692
Mfr. Part No.3RH2911-2HA30
BrandSiemens
HK$91.72
Each
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3 3NO Sirius Innovation Snap-On 10 A 600 V dc, 690 V ac 3PST Spring Load -25°C +60°C -25 → +60 °C 3RH29 - -
RS Stock No. 122-0926
Mfr. Part No.BFC0-02
BrandWEG
HK$61.84
Each
units
2 2NC - Front Mount 10 A 690 V ac DPST Screw - - -25 → +55 °C BFC0 - -
RS Stock No. 493-0680
Mfr. Part No.DILA-XHI22
BrandEaton
HK$112.78
Each
units
4 2NO/2NC - Front Mount 4 A ac, 10 A dc 220 V dc, 500 V ac 4PST Screw - - - DILA - -
RS Stock No. 122-1056
Mfr. Part No.BFB-04 EN
BrandWEG
HK$116.32
Each
units
4 4NC - Front Mount 10 A 690 V ac 4PST Screw - - -25 → +55 °C BFB - -
RS Stock No. 493-0674
Mfr. Part No.DILA-XHI31
BrandEaton
HK$100.63
Each
units
4 3NO/NC - Front Mount 4 A ac, 10 A dc 220 V dc, 500 V ac 4PST Screw - - - DILA - -
RS Stock No. 183-3782
Mfr. Part No.359624
BrandABB
HK$404.53
Each
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2 NC/NO - DIN Rail Mount 10 A 24 V ac/dc - - - - - S2C - -
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