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. 711-6395
Mfr. Part No.CA4-13N
BrandABB
HK$178.35
Each
units
4 NO/3NC - Front Mount 6 A 600 V dc, 690 V ac 4P Screw -40°C +70°C -40 → +70 °C CA4 - -
RS Stock No. 901-0860
Mfr. Part No.11BGX1022
BrandLovato
HK$147.92
Each
units
4 2NO/2NC - DIN Rail Mount 10 A 690 V 4PST Screw - - - BG - -
RS Stock No. 751-5916
Mfr. Part No.3RT1966-4G
BrandSiemens
HK$826.54
Each
units
- - Sirius Classic - - - - - - - - 3RT1 - -
RS Stock No. 711-6385
Mfr. Part No.CA4-40N
BrandABB
HK$178.35
Each
units
4 4NO - Front Mount 6 A 600 V dc, 690 V ac 4P Screw -40°C +70°C -40 → +70 °C CA4 - -
RS Stock No. 124-3133
Mfr. Part No.5ST3040
BrandSiemens
HK$909.31
Each
units
- - Sentron - - - - - - - - 5ST3 - -
RS Stock No. 122-0951
Mfr. Part No.BFCA-22
BrandWEG
HK$99.66
Each
units
4 2NO/2NC - Front Mount 10 A 690 V ac 4PST Screw - - -25 → +55 °C BFCA - -
RS Stock No. 124-3139
Mfr. Part No.5ST3045
BrandSiemens
HK$691.96
Each
units
- - Sentron - - - - - - - - 5ST3 - -
RS Stock No. 493-0680
Mfr. Part No.DILA-XHI22
BrandEaton
HK$112.74
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. 706-1881
Mfr. Part No.3RV2901-1B
BrandSiemens
HK$85.69
Each
units
2 2NO Sirius Innovation Plug In 2 A dc, 10 A ac 250 V dc, 690 V ac DP Screw -20°C +60°C -20 +60 °C 3RV2 - -
RS Stock No. 122-0953
Mfr. Part No.BFCA-40
BrandWEG
HK$107.93
Each
units
4 4NO - Front Mount 10 A 690 V ac 4PST Screw - - -25 → +55 °C BFCA - -
RS Stock No. 178-8041
Mfr. Part No.NHI12-PKZ0
BrandEaton
HK$174.94
Each
units
3 NO/2NC - Side Mount 2 (DC) A, 3.5 (AC) A 250 V dc, 500 V ac 3P Screw -25°C +55°C -25 +55 °C NHI12 - -
RS Stock No. 711-6373
Mfr. Part No.CA4-31U
BrandABB
HK$178.35
Each
units
4 3NO/NC - Front Mount 6 A 600 V dc, 690 V ac 4P Screw - - - CA4 - -
RS Stock No. 136-3686
Mfr. Part No.3RH2911-1XA40-0MA0
BrandSiemens
HK$113.68
Each
units
4 4NO Sirius Innovation Snap-On 10 A 600 V dc, 690 V ac 4PST Screw -25°C +60°C -25 → +60 °C 3RH29 - -
RS Stock No. 122-0928
Mfr. Part No.BFC0-11
BrandWEG
HK$61.84
Each
units
2 NO/NC - Front Mount 10 A 690 V ac DPST Screw - - -25 → +55 °C BFC0 - -
RS Stock No. 922-7213
Mfr. Part No.FAZ-XHINW1
BrandEaton
HK$206.95
Each
units
2 CO - DIN Rail Mount 3 A ac, 500 mA dc 120 V dc, 240 V ac SPCO Screw - - - FAZ - -
RS Stock No. 776-1572
Mfr. Part No.022.35
BrandFinder
HK$209.10
Each
units
1 NO/NC - DIN Rail Mount 6 A 230 V DPST Screw - - - 22 Series - -
RS Stock No. 482-4434
Mfr. Part No.1SCA022353R4970
BrandABB
HK$70.74
Each
units
1 NO - - - - - - - - - - - -
RS Stock No. 363-5772
Mfr. Part No.LA1KN133
HK$153.30
Each
units
4 NO/3NC - Clip On 10 A 600 V ac 4P Cage Clamp - - - LA1K - -
RS Stock No. 759-027
Mfr. Part No.LA1KN11
HK$57.12
Each
units
2 NO/NC TeSys Clip On 10 A 600 V ac DP Screw - - - LA1K - -
RS Stock No. 714-1795
Mfr. Part No.SSP25/RS
HK$67.84
Each
units
- - - Side Mount 25 A 690 V - Screw - - - - - -
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