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. 608-7889
Mfr. Part No.GS1AN22
HK$743.60
Each
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4 2NO/2NC - Front Mount, Side Mount 1.25 kA - 4P - - - - GS1A - -
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Mfr. Part No.DF14AM1
HK$93.33
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units
1 - - DIN Rail Mount 50 A - SP - - - - DF14 - -
RS Stock No. 363-5772
Mfr. Part No.LA1KN133
HK$153.30
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4 NO/3NC - Clip On 10 A 600 V ac 4P Cage Clamp - - - LA1K - -
RS Stock No. 711-6317
Mfr. Part No.1SBN010110R1010
BrandABB
HK$55.63
Each
units
1 NO - Front Mount 6 A 600 V dc, 690 V ac SP Screw - - - CA4 - -
RS Stock No. 445-8093
Mfr. Part No.GHE3401321R0001
BrandABB
HK$249.51
Each
units
2 2NO - DIN Rail Mount 4 A 220 V dc, 400 V ac DP Screw -25°C +55°C -25 +55 °C ESB - -
RS Stock No. 608-8781
Mfr. Part No.GV7AE11
HK$293.78
Each
units
1 NO/NC - - - 250 V dc, 690 V ac SPDT Screw - - - GV7A - -
RS Stock No. 610-3127
Mfr. Part No.GVAE113
HK$268.59
Each
units
2 NO/NC - Front Mount - 60 V dc, 240 V ac DP - - - - GVAE - -
RS Stock No. 209-5628
Mfr. Part No.M5723107
BrandMETCASE
HK$625.09
Each
units
- - - - - - - - - - - - - -
RS Stock No. 136-3686
Mfr. Part No.3RH2911-1XA40-0MA0
BrandSiemens
HK$113.68
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. 706-0945
Mfr. Part No.3RH2911-2FA04
BrandSiemens
HK$109.14
Each
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4 4NC Sirius Innovation Snap-On 6 A ac, 10 A dc 250 V dc, 690 V ac 4PST Cage Clamp -25°C +60°C -25 +60 °C 3RH2 - -
RS Stock No. 746-0793
Mfr. Part No.3RH2911-1GA40
BrandSiemens
HK$113.14
Each
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4 4NO Sirius Innovation Snap Front 10 A 600 V dc, 690 V ac 4P Screw - - -25 +60 °C 3RH2 - -
RS Stock No. 711-6363
Mfr. Part No.CA4-31M
BrandABB
HK$178.35
Each
units
4 3NO/NC - Front Mount 6 A 600 V dc, 690 V ac 4P Screw - - - CA4 - -
RS Stock No. 178-7896
Mfr. Part No.LV426952
HK$237.49
Each
units
1 NO/NC - Clip On 5 A 110 V dc, 690 V ac - Pre-Wire - - - - - -
RS Stock No. 714-1773
Mfr. Part No.SAUX2EB
HK$129.50
Each
units
2 - - Side Mount - - DP Screw - - - - - -
RS Stock No. 751-5714
Mfr. Part No.3RT1916-2FK21
BrandSiemens
HK$634.58
Each
units
2 NO/NC Sirius Classic DIN Rail Mount - - - Screw -25°C +60°C -25 +60 °C 3RT1 - -
RS Stock No. 706-0961
Mfr. Part No.3RH2911-2HA03
BrandSiemens
HK$88.66
Each
units
3 3NC Sirius Innovation Snap-On 6 A dc, 10 A ac 250 V dc, 690 V ac 3PST Cage Clamp -25°C +60°C -25 +60 °C - - -
RS Stock No. 209-5779
Mfr. Part No.M5725234
BrandMETCASE
HK$1,482.28
Each
units
- - - - - - - - - - - Mettec 250 x 263 x 120mm 250 mm
RS Stock No. 122-0929
Mfr. Part No.BFC0-13
BrandWEG
HK$100.81
Each
units
4 NO/3NC - Front Mount 10 A 690 V ac 4PST Screw - - -25 → +55 °C BFC0 - -
RS Stock No. 136-3689
Mfr. Part No.3RH2911-2GA04
BrandSiemens
HK$113.68
Each
units
4 4NC 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. 243-7454
Mfr. Part No.3RH1911-1AA10
BrandSiemens
HK$46.68
Each
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1 NO Sirius Classic Snap-On 6 A - SP Screw - - - 3RH1 - -
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