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. 257-3689
Mfr. Part No.VZ01
HK$92.55
Each
units
1 - - Side Mount 16 A 690 V ac SP Screw -20°C +50°C -20 → +50 °C VZ01 - -
RS Stock No. 395-0627
Mfr. Part No.GVAE1
HK$63.95
Each
units
2 NO/NC - Front Mount - 60 V dc, 240 V ac DP Screw - - - GVAE - -
RS Stock No. 394-9885
Mfr. Part No.LADN31
HK$165.73
Each
units
4 3NO/NC TeSys Front Mount 10 A - 4P Screw -5°C +60°C - LADN - -
RS Stock No. 326-712
Mfr. Part No.11DILE
BrandEaton
HK$84.08
Each
units
2 NO/NC - Front Mount 2.5 A dc, 4 A ac 220 V dc, 500 V ac DPST Screw - - - - - -
RS Stock No. 746-0705
Mfr. Part No.3RH1921-1HA22
BrandSiemens
HK$113.34
Each
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4 2NO/2NC Sirius Classic Snap Front - - 4P Screw - - - 3RH1 - -
RS Stock No. 467-5490
Mfr. Part No.1SDA051370R1
BrandABB
HK$597.28
Each
units
1 NO/NC - - - - SPDT - - - - TMAX - -
RS Stock No. 791-2852
Mfr. Part No.A9C15419
HK$766.48
Each
units
- - Acti 9 DIN Rail Mount - 12 → 48 V ac - Screw -5°C +50°C -5 → +50 °C iATET - -
RS Stock No. 246-5077
Mfr. Part No.3RV1901-1B
BrandSiemens
HK$89.78
Each
units
2 2NO Sirius Classic Side Mount 2 A 24 V ac DP - - +60°C Maximum of +60 °C 3RV1 - -
RS Stock No. 209-6463
Mfr. Part No.M5735104
BrandMETCASE
HK$943.34
Each
units
- - - - - - - - - - - Mettec 350 x 250 x 85mm 350 mm
RS Stock No. 392-8967
Mfr. Part No.3RH1921-1CA10
BrandSiemens
HK$58.23
Each
units
1 NO Sirius Classic Snap-On - - SP Screw - - - 3RH1 - -
RS Stock No. 257-3702
Mfr. Part No.VZ1
HK$113.48
Each
units
1 - - Side Mount 25 A 690 V ac SP Screw -20°C +50°C -20 → +50 °C VZ1 - -
RS Stock No. 394-9914
Mfr. Part No.LADN20
HK$67.66
Each
units
2 2NO TeSys Front Mount 10 A - DP Screw - - - LADN - -
RS Stock No. 746-0800
Mfr. Part No.3RH2921-1DA11
BrandSiemens
HK$101.13
Each
units
2 NO/NC Sirius Innovation Lateral 10 A 600 V dc, 690 V ac DP Screw - - -25 → +60 °C 3RH2 - -
RS Stock No. 243-9898
Mfr. Part No.GAC0521
HK$355.78
Each
units
2 NO/NC - Clip On - - DP - - - - GAC0 - -
RS Stock No. 400-1473
Mfr. Part No.LAD8N20
HK$141.17
Each
units
- 2NO - Side - - - Screw Clamp - - - LAD8 - -
RS Stock No. 219-1439
Mfr. Part No.HI11-P1/P3E-SOND
BrandEaton
HK$118.63
Each
units
2 NO/NC - Side Mount 10 A - - - - +50°C - - - -
RS Stock No. 776-2932
Mfr. Part No.A9N26959
HK$1,110.00
Each
units
- - Acti 9 - - - - - - - - iC60 - -
RS Stock No. 711-6360
Mfr. Part No.CA4-22M
BrandABB
HK$134.99
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. 751-5916
Mfr. Part No.3RT1966-4G
BrandSiemens
HK$845.58
Each
units
- - Sirius Classic - - - - - - - - 3RT1 - -
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 - -