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. 178-7895
Mfr. Part No.LV426951
HK$237.49
Each
units
1 NO/NC - Clip On 5 A 110 V dc, 690 V ac - Pre-Wire - - - - - -
RS Stock No. 178-8010
Mfr. Part No.DILA-XHIR11
BrandEaton
HK$165.84
Each
units
2 NO/NC - Front Fastening 4 (AC) A, 10 (DC) A 220 V dc, 500 V ac 2P Screw -25°C +60°C -25 → +60 °C DILA - -
RS Stock No. 706-0923
Mfr. Part No.3RH2911-1HA22
BrandSiemens
HK$113.14
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. 122-0941
Mfr. Part No.BFC4-13
BrandWEG
HK$99.18
Each
units
4 NO/3NC - Front Mount 10 A 690 V ac 4PST Screw - - -25 → +55 °C BFC4 - -
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. 257-3774
Mfr. Part No.VZ12
HK$228.91
Each
units
- - - Side Mount 63 A - - - - - - VZ12 - -
RS Stock No. 136-3688
Mfr. Part No.3RH2911-2FC22
BrandSiemens
HK$180.52
Each
units
4 2NO/2NC Sirius Innovation Snap-On 10 A 600 V dc, 690 V ac 4PST Spring Load -25°C +60°C -25 → +60 °C 3RH29 - -
RS Stock No. 373-2283
Mfr. Part No.YM-250
HK$175.26
Each
units
- - - - - - - - - - - - - -
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. 209-5713
Mfr. Part No.M5723204
BrandMETCASE
HK$768.31
Each
units
- - - - - - - - - - - - - -
RS Stock No. 178-8011
Mfr. Part No.DILA-XHIR22
BrandEaton
HK$296.44
Each
units
4 2NO/2NC - Front Fastening 4 (AC) A, 10 (DC) A 220 V dc, 500 V ac 4P Screw -25°C +60°C -25 → +60 °C DILA - -
RS Stock No. 209-5634
Mfr. Part No.M5723127
BrandMETCASE
HK$570.17
Each
units
- - - - - - - - - - - - - -
RS Stock No. 916-0261
Mfr. Part No.EUCA11
BrandEuropa
HK$97.35
Each
units
1 CO - DIN Rail Mount 6 A 130 V dc, 400 V ac SPCO Screw - - - - - -
RS Stock No. 791-2828
Mfr. Part No.A9A26929
HK$388.96
Each
units
4 NO/NC + NO/NC Acti 9 DIN Rail Mount 2 A dc, 6 A ac 24 → 130 V dc, 240 → 415 V ac 4P Screw -35°C +70°C -35 → +70 °C iOF - -
RS Stock No. 176-5640
Mfr. Part No.DS2208-SR7U2100SGW
BrandZebra
HK$2,935.42
Each
units
- - - - - - - - - - - - - -
RS Stock No. 373-2227
Mfr. Part No.YM-80
HK$51.94
Each
units
- - - - - - - - - - - - - -
RS Stock No. 706-0936
Mfr. Part No.3RH2911-1HA31
BrandSiemens
HK$112.20
Each
units
4 3NO/NC Sirius Innovation Snap-On 6 A ac, 10 A dc 250 V dc, 690 V ac 4PST Screw -25°C +60°C -25 → +60 °C 3RH2 - -
RS Stock No. 209-5921
Mfr. Part No.M5735317
BrandMETCASE
HK$1,312.61
Each
units
- - - - - - - - - - - Mettec 350 x 263 x 150mm 350 mm
RS Stock No. 136-3686
Mfr. Part No.3RH2911-1XA40-0MA0
BrandSiemens
HK$113.14
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. 706-0927
Mfr. Part No.3RH2911-1HA30
BrandSiemens
HK$88.66
Each
units
3 3NO Sirius Innovation Snap-On 6 A dc, 10 A ac 250 V dc, 690 V ac 3PST Screw -25°C +60°C -25 → +60 °C - - -
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