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. 395-0627
Mfr. Part No.GVAE1
HK$199.55
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2 NO/NC - Front Mount - 60 V dc, 240 V ac DP Screw - - - GVAE - -
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Mfr. Part No.3RH1921-1HA22
BrandSiemens
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4 2NO/2NC Sirius Classic Snap Front - - 4P Screw - - - 3RH1 - -
RS Stock No. 257-3702
Mfr. Part No.VZ1
HK$113.48
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1 - - Side Mount 25 A 690 V ac SP Screw -20°C +50°C -20 → +50 °C VZ1 - -
RS Stock No. 746-0800
Mfr. Part No.3RH2921-1DA11
BrandSiemens
HK$101.13
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2 NO/NC Sirius Innovation Lateral 10 A 600 V dc, 690 V ac DP Screw - - -25 +60 °C 3RH2 - -
RS Stock No. 493-9110
HK$247.55
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2 NO/NC TeSys U Series - 5 A 24 → 250 V ac/dc - - - - - - - -
RS Stock No. 874-4534
Mfr. Part No.3VA9988-0AA11
BrandSiemens
HK$226.40
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6 4NO/2NC Sentron Side Mount 10 A - - Screw - - - 3VA - -
RS Stock No. 272-870
Mfr. Part No.GVAED011
HK$149.18
Each
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2 NO/NC - Front Mount - - DP - - - - GVAE - -
RS Stock No. 209-5864
Mfr. Part No.M5735207
BrandMETCASE
HK$1,008.84
Each
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- - - - - - - - - - - Mettec 350 x 250 x 120mm 350 mm
RS Stock No. 706-1917
Mfr. Part No.3RV2901-2E
BrandSiemens
HK$85.69
Each
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2 NO/NC Sirius Innovation Plug In 1 A dc, 2.5 A ac 60 V dc, 230 V ac DP Cage Clamp -20°C +60°C -20 +60 °C - - -
RS Stock No. 326-712
Mfr. Part No.11DILE
BrandEaton
HK$87.82
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. 400-1467
Mfr. Part No.LAD8N11
HK$100.15
Each
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- - - - - - - - - - - LAD8 - -
RS Stock No. 209-6463
Mfr. Part No.M5735104
BrandMETCASE
HK$943.34
Each
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- - - - - - - - - - - Mettec 350 x 250 x 85mm 350 mm
RS Stock No. 279-6315
Mfr. Part No.LA1KN04
HK$77.74
Each
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4 4NC - Clip On 10 A 600 V ac 4P Screw - - - LA1K - -
RS Stock No. 513-0184
Mfr. Part No.DILM150-XHI11
BrandEaton
HK$70.45
Each
units
2 NO/NC - Front Mount 4 A ac, 10 A dc 220 V dc, 500 V ac DPST Screw - - - DILM - -
RS Stock No. 363-5788
Mfr. Part No.LA1KN043
HK$153.30
Each
units
4 4NC - Clip On 10 A 600 V ac 4P Cage Clamp - - - LA1K - -
RS Stock No. 711-6351
Mfr. Part No.CA4-04E
BrandABB
HK$178.35
Each
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4 4NC - Front Mount 6 A 600 V dc, 690 V ac 4P Screw - - - CA4 - -
RS Stock No. 513-0190
Mfr. Part No.DILM150-XHI02
BrandEaton
HK$70.13
Each
units
2 2NC - Front Mount 4 A ac, 10 A dc 220 V dc, 500 V ac DPST Screw - - - DILM - -
RS Stock No. 791-2840
Mfr. Part No.A9C15916
HK$480.48
Each
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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. 124-3132
Mfr. Part No.5ST3031
BrandSiemens
HK$441.50
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- - Sentron - - - - - - - - 5ST3 - -
RS Stock No. 395-0352
Mfr. Part No.GV2AF3
HK$50.01
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- - - - - - - - - - - GV2A - -
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