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. 708-1801
Mfr. Part No.GS1AM101
HK$84.08
Each
units
1 NC - Top 10 A 600 V ac SP - - - - GS1A - -
RS Stock No. 610-1064
Mfr. Part No.GV1G02
HK$55.26
Each
units
- - - - - - - - - - - GV1G - -
RS Stock No. 445-0415
Mfr. Part No.1SAM201901R1001
BrandABB
HK$87.66
Each
units
2 NO/NC - Front Mount 1 A dc, 3 A ac 220 V dc, 230 V ac DP - - - - HK1 - -
RS Stock No. 711-6357
Mfr. Part No.CA4-31E
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. 866-1495
Mfr. Part No.XTCEXSBN11
BrandEaton
HK$287.84
Each
units
2 NO/NC - Side Mount 10 A - DPDT Screw - +50°C - - - -
RS Stock No. 178-8040
Mfr. Part No.NHI11-PKZ0-C
BrandEaton
HK$106.96
Each
units
2 NO/NC - Side Mount 2 (DC) A, 3.5 (AC) A 250 V dc, 500 V ac 2P Spring Clamp -25°C +55°C -25 +55 °C NHI11 - -
RS Stock No. 512-9493
Mfr. Part No.OA4B10
BrandABB
HK$182.01
Each
units
1 NO - Snap-On - - SP - - - - - - -
RS Stock No. 751-5916
Mfr. Part No.3RT1966-4G
BrandSiemens
HK$826.54
Each
units
- - Sirius Classic - - - - - - - - 3RT1 - -
RS Stock No. 395-0138
Mfr. Part No.GVAE20
HK$97.70
Each
units
2 2NO - Front Mount - 60 V dc, 240 V ac DP Screw - - - GVAE - -
RS Stock No. 706-0939
Mfr. Part No.3RH2911-2DA02
BrandSiemens
HK$97.35
Each
units
2 2NC Sirius Innovation Snap-On 10 A 250 V dc, 690 V ac DPST Cage Clamp -25°C +60°C -25 +60 °C - - -
RS Stock No. 714-1934
Mfr. Part No.SAUXCO
HK$129.50
Each
units
2 NO/NC - Side Mount - - DP Screw - - - - - -
RS Stock No. 711-6351
Mfr. Part No.CA4-04E
BrandABB
HK$178.35
Each
units
4 4NC - Front Mount 6 A 600 V dc, 690 V ac 4P Screw - - - CA4 - -
RS Stock No. 122-0935
Mfr. Part No.BFC025-22
BrandWEG
HK$100.33
Each
units
4 2NO/2NC - Front Mount 10 A 690 V ac 4PST Screw - - -25 → +55 °C BFC025 - -
RS Stock No. 363-5738
Mfr. Part No.LA1KN403
HK$153.30
Each
units
4 4NO - Clip On 10 A 600 V ac 4P Cage Clamp - - - LA1K - -
RS Stock No. 124-3128
Mfr. Part No.5ST3020
BrandSiemens
HK$297.67
Each
units
- - Sentron - - - - - - - - 5ST3 - -
RS Stock No. 759-011
Mfr. Part No.LA1KN20
HK$58.73
Each
units
2 2NO - Clip On 10 A 600 V ac DP Screw - - - LA1K - -
RS Stock No. 122-0948
Mfr. Part No.BFCA-11
BrandWEG
HK$60.98
Each
units
2 NO/NC - Front Mount 10 A 690 V ac DPST Screw - - -25 → +55 °C BFCA - -
RS Stock No. 209-5577
Mfr. Part No.M5725104
BrandMETCASE
HK$682.17
Each
units
- - - - - - - - - - - Mettec 250 x 250 x 85mm 250 mm
RS Stock No. 136-3694
Mfr. Part No.3RH2911-2XA31-0MA0
BrandSiemens
HK$113.14
Each
units
4 3NO/NC 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. 257-3746
Mfr. Part No.VZ20
HK$164.85
Each
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2 2NO - - 12 A - DP - - - - VZ20 - -
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