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. 706-0958
Mfr. Part No.3RH2911-2FB11
BrandSiemens
HK$131.22
Each
units
2 NO/NC Sirius Innovation Snap-On 6 A ac, 10 A dc 250 V dc, 690 V ac DPST Cage Clamp -25°C +60°C -25 +60 °C - - -
RS Stock No. 223-4817
Mfr. Part No.39990701
BrandSocomec
HK$71.96
Each
units
1 NO - - 2.8 A dc, 3 A ac 48 V dc, 400 V ac SP - - - - - - -
RS Stock No. 187-891
Mfr. Part No.LADN01
HK$104.60
Each
units
1 NC - Front Mount 10 A 690 V ac SP Screw -5°C +60°C -5 → +60 °C LADN - -
RS Stock No. 319-691
Mfr. Part No.K0 H010/A11-VE
HK$100.92
Each
units
2 NO/NC - - 25 A, 32 A - DP - - - - - - -
RS Stock No. 513-0263
Mfr. Part No.DILM150-XHIV22
BrandEaton
HK$118.63
Each
units
4 2NO/2NC - Front Mount 4 A ac, 10 A dc 220 V dc, 500 V ac 4PST Screw - - - DILM - -
RS Stock No. 136-3691
Mfr. Part No.3RH2911-2HA13
BrandSiemens
HK$113.68
Each
units
4 NO/3NC 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. 136-3697
Mfr. Part No.3RH2911-4FA40
BrandSiemens
HK$113.68
Each
units
4 4NO Sirius Innovation Snap-On 10 A 600 V dc, 690 V ac 4PST Ring Cable -25°C +60°C -25 → +60 °C 3RH29 - -
RS Stock No. 395-0100
Mfr. Part No.GVAN20
HK$297.95
Each
units
2 2NO - Side Mount - 240 V dc, 690 V ac DP Screw - - - GVAN - -
RS Stock No. 194-6338
Mfr. Part No.1SBN010013R1010
BrandABB
HK$58.62
Each
units
1 NO - Front Mount 6 A 127 V - Screw - - - - - -
RS Stock No. 187-560
Mfr. Part No.VZN05
HK$80.46
Each
units
1 NO - - - - SP - - - - VZN0 - -
RS Stock No. 513-0207
Mfr. Part No.DILM150-XHI40
BrandEaton
HK$118.63
Each
units
4 4NO - Front Mount 4 A ac, 10 A dc 220 V dc, 500 V ac 4PST Screw - - - DILM - -
RS Stock No. 400-1401
Mfr. Part No.GVAM11
HK$268.59
Each
units
1 NO/NC - Side Mount - - SPDT Screw - - - GVAM - -
RS Stock No. 257-3730
Mfr. Part No.VZ4
HK$221.25
Each
units
1 - - Side Mount 63 A 690 V ac SP Screw -20°C +50°C -20 → +50 °C VZ4 - -
RS Stock No. 776-2944
Mfr. Part No.A9A26500
HK$1,932.90
Each
units
- - Acti 9 - - - - - - - - iMSU - -
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. 706-0860
Mfr. Part No.3RH2911-1DA02
BrandSiemens
HK$97.35
Each
units
2 2NC Sirius Innovation Snap-On 10 A 250 V dc, 690 V ac DPST Screw -25°C +60°C -25 +60 °C - - -
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. 209-5640
Mfr. Part No.M5723117
BrandMETCASE
HK$712.60
Each
units
- - - - - - - - - - - - - -
RS Stock No. 209-5577
Mfr. Part No.M5725104
BrandMETCASE
HK$682.17
Each
units
- - - - - - - - - - - Mettec 250 x 250 x 85mm 250 mm
New
RS Stock No. 195-8785
Mfr. Part No.DILM1000-XHI11-SI
BrandMoeller
HK$159.24
Each
units
2 NO/NC - Side Mount 10 A 500 V 2P Screw -40°C +80°C -40 → +80 °C DILM - -