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 Width External Dimensions
RS Stock No. 209-5915
Mfr. Part No.M5725317
BrandMETCASE
HK$1,217.33
Each
units
- - - - - - - - - - - Mettec 263 mm 250 x 263 x 150mm
RS Stock No. 492-1692
Mfr. Part No.082884 & NHI-E-10-PKZ0
BrandEaton
HK$75.88
Each
units
1 NO - Front Mount 1 A ac, 2 A dc 110 V dc, 240 V ac SPST Screw - - - - - -
RS Stock No. 192-0814
Mfr. Part No.66427
BrandABB
HK$1,222.02
Each
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3 3CO - DIN Rail Mount - 250 V ac/dc SPDT - - - - - - -
RS Stock No. 493-0674
Mfr. Part No.276427 & DILA-XHI31
BrandEaton
HK$103.65
Each
units
4 3NO/NC - Front Mount 4 A ac, 10 A dc 220 V dc, 500 V ac 4PST Screw - - - DILA - -
RS Stock No. 714-1795
Mfr. Part No.SSP25/RS
HK$67.84
Each
units
- - - Side Mount 25 A 690 V - Screw - - - - - -
RS Stock No. 121-6865
BrandRS PRO
HK$40.37
Each
units
1 1NO - DIN Rail Mount - - - Screw -25°C +60°C -25 → +60 °C HSV - -
New
RS Stock No. 203-1987
Mfr. Part No.3KD9103-3
BrandSiemens
HK$117.44
Each
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1 1CO SENTRON Plug In 100 mA - - - - - - 3KD - -
RS Stock No. 776-2954
Mfr. Part No.A9N26927
HK$401.54
Each
units
1 CO Acti 9 DIN Rail Mount 6 A ac, 6 A dc 130 V dc, 415 V ac SPDT Clamp -35°C +70°C -35 → +70 °C iC60 - -
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. 435-421
Mfr. Part No.2CCS800900R0021
BrandABB
HK$427.93
Each
units
2 2NO/2NC - DIN Rail Mount 4 A dc, 6 A ac 250 V dc, 400 V ac DPDT Screw -25°C +60°C -25 → +60 °C S800 - -
RS Stock No. 706-1897
Mfr. Part No.3RV2901-1E
BrandSiemens
HK$114.59
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 Screw -20°C +60°C -20 → +60 °C 3RV2 - -
RS Stock No. 122-0931
Mfr. Part No.BFC0-22
BrandWEG
HK$100.81
Each
units
4 2NO/2NC - Front Mount 10 A 690 V ac 4PST Screw - - -25 → +55 °C BFC0 - -
RS Stock No. 608-8781
Mfr. Part No.GV7AE11
HK$335.01
Each
units
1 NO/NC - - - 250 V dc, 690 V ac SPDT Screw - - - GV7A - -
RS Stock No. 711-6317
Mfr. Part No.1SBN010110R1010
BrandABB
HK$43.79
Each
units
1 NO - Front Mount 6 A 600 V dc, 690 V ac SP Screw - - - CA4 - -
RS Stock No. 706-0901
Mfr. Part No.3RH2911-1HA10
BrandSiemens
HK$51.82
Each
units
1 NO Sirius Innovation Snap-On 6 A dc, 10 A ac 250 V dc, 690 V ac SPST Screw -25°C +60°C -25 → +60 °C - - -
RS Stock No. 746-0718
Mfr. Part No.3RH1921-1JA11
BrandSiemens
HK$82.45
Each
units
2 NO/NC Sirius Classic Lateral - - DP Screw - - - 3RH1 - -
RS Stock No. 122-1072
Mfr. Part No.BLB-20 EN
BrandWEG
HK$86.55
Each
units
2 2NO - Side Mount 10 A 690 V ac DPST Screw - - -25 → +55 °C BLB - -
RS Stock No. 257-3746
Mfr. Part No.VZ20
HK$164.85
Each
units
2 2NO - - 12 A - DP - - - - VZ20 - -
RS Stock No. 363-5722
Mfr. Part No.LA1KN113
HK$88.09
Each
units
2 NO/NC - Clip On 10 A 600 V ac DP Cage Clamp - - - LA1K - -
RS Stock No. 521-4585
Mfr. Part No.5ST3011
BrandSiemens
HK$179.97
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2 2NO Sentron DIN Rail Mount 6 A 230 V ac DP Screw -5°C +40°C -5 → +40 °C 5ST3 - -
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