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. 412-2621
Mfr. Part No.DILM820-XHI11-SI
BrandEaton
HK$175.87
Each
units
2 NO/NC - Side Mount 4 A ac, 10 A dc 220 V dc, 500 V ac DPST Screw - - - DILM - -
RS Stock No. 711-6389
Mfr. Part No.CA4-22N
BrandABB
HK$178.35
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. 746-0799
Mfr. Part No.3RH2911-1GA31
BrandSiemens
HK$113.14
Each
units
4 3NO/NC Sirius Innovation Snap Front 10 A 600 V dc, 690 V ac 4P Screw - - -25 +60 °C 3RH2 - -
RS Stock No. 727-1549
Mfr. Part No.1SCA022353R4890
BrandABB
HK$85.14
Each
units
1 NC - Snap-On 6 A ac, 10 A dc 400 V dc, 690 V ac SP Screw - - - OA1G - -
RS Stock No. 122-0944
Mfr. Part No.BFC4-31
BrandWEG
HK$99.66
Each
units
4 3NO/NC - Front Mount 10 A 690 V ac 4PST Screw - - -25 → +55 °C BFC4 - -
RS Stock No. 791-2840
Mfr. Part No.A9C15916
HK$480.48
Each
units
2 2NO Acti 9 DIN Rail Mount 2 A 24 130 V dc, 24 240 V ac DP Screw -5°C +50°C - iACT - -
RS Stock No. 492-1692
Mfr. Part No.NHI-E-10-PKZ0
BrandEaton
HK$71.52
Each
units
1 NO - Front Mount 1 A ac, 2 A dc 110 V dc, 240 V ac SPST Screw - - - - - -
RS Stock No. 513-0162
Mfr. Part No.DILM150-XHI20
BrandEaton
HK$70.13
Each
units
2 2NO - Front Mount 4 A ac, 10 A dc 220 V dc, 500 V ac DPST Screw - - - DILM - -
RS Stock No. 711-6351
Mfr. Part No.CA4-04E
BrandABB
HK$178.35
Each
units
4 4NC - Front Mount 6 A 600 V dc, 690 V ac 4P Screw - - - CA4 - -
RS Stock No. 136-3698
BrandSiemens
HK$101.61
Each
units
2 2NC Sirius Innovation Snap-On 10 A 600 V dc, 690 V ac DPST Spring Load -25°C +60°C -25 → +60 °C 3RH29 - -
RS Stock No. 121-6865
BrandRS PRO
HK$40.37
Each
units
1 NO - DIN Rail Mount - - - Screw -25°C +60°C -25 +60 °C HSV - -
RS Stock No. 326-734
Mfr. Part No.22DILE
BrandEaton
HK$121.82
Each
units
4 2NO/2NC - Front Mount 2.5 A dc, 4 A ac 220 V dc, 500 V ac 4PST Screw - - - - - -
RS Stock No. 711-6332
Mfr. Part No.CC4-10
BrandABB
HK$151.69
Each
units
1 NO - Front Mount 6 A 600 V dc, 690 V ac SP Screw -40°C +70°C -40 +70 °C EF14 - -
RS Stock No. 122-0949
Mfr. Part No.BFCA-13
BrandWEG
HK$100.81
Each
units
4 NO/3NC - Front Mount 10 A 690 V ac 4PST Screw - - -25 → +55 °C BFCA - -
RS Stock No. 121-6873
BrandRS PRO
HK$25.22
Each
units
- - - DIN Rail Mount - - - Screw -25°C +60°C -25 +60 °C MSK - -
RS Stock No. 209-5555
Mfr. Part No.M5723114
BrandMETCASE
HK$912.57
Each
units
- - - - - - - - - - - - - -
New
RS Stock No. 201-3605
Mfr. Part No.LADN203
HK$161.88
Each
units
- - - - - - - - - - - - - -
RS Stock No. 395-0352
Mfr. Part No.GV2AF3
HK$50.01
Each
units
- - - - - - - - - - - GV2A - -
RS Stock No. 609-4398
Mfr. Part No.VZN11
HK$102.27
Each
units
- - - Side Mount 16 A - - - - - - VZN1 - -
RS Stock No. 209-5814
Mfr. Part No.M5723217
BrandMETCASE
HK$756.07
Each
units
- - - - - - - - - - - Mettec 230 x 193 x 120mm 230 mm
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