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. 420-7558
Mfr. Part No.0 227 04
BrandLegrand
HK$317.46
Each
units
2 NO/NC - - 5 A 250 V DP Solder Tag - - - - - -
RS Stock No. 706-0958
Mfr. Part No.3RH2911-2FB11
BrandSiemens
HK$131.22
Each
units
2 NO/NC Sirius Innovation Snap-On 6 A ac, 10 A dc 250 V dc, 690 V ac DPST Cage Clamp -25°C +60°C -25 +60 °C - - -
RS Stock No. 122-1056
Mfr. Part No.BFB-04 EN
BrandWEG
HK$116.32
Each
units
4 4NC - Front Mount 10 A 690 V ac 4PST Screw - - -25 → +55 °C BFB - -
RS Stock No. 272-864
Mfr. Part No.GVAED101
HK$142.42
Each
units
2 2NO - Front Mount - - DP - - - - GVAE - -
RS Stock No. 706-0872
Mfr. Part No.3RH2911-1DA20
BrandSiemens
HK$101.13
Each
units
2 2NO Sirius Innovation Snap-On 10 A 250 V dc, 690 V ac DPST Screw -25°C +60°C -25 +60 °C - - -
RS Stock No. 706-0898
Mfr. Part No.3RH2911-1HA02
BrandSiemens
HK$67.15
Each
units
2 2NC Sirius Innovation Snap-On 6 A dc, 10 A ac 250 V dc, 690 V ac DPST Screw -25°C +60°C -25 +60 °C 3RH2 - -
RS Stock No. 445-8166
Mfr. Part No.GJL1201330R0003 - CAF6-11M
BrandABB
HK$87.52
Each
units
2 NO/NC - Front Mount - 240 V dc, 500 V ac DP Screw - - - B6 - -
RS Stock No. 413-1669
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. 209-5870
Mfr. Part No.M5735217
BrandMETCASE
HK$1,225.00
Each
units
- - - - - - - - - - - Mettec 350 x 263 x 120mm 350 mm
RS Stock No. 257-3718
Mfr. Part No.VZ2
HK$131.33
Each
units
1 - - Side Mount 32 A 690 V ac SP Screw -20°C +50°C -20 → +50 °C VZ2 - -
RS Stock No. 874-4537
Mfr. Part No.3VA9988-0AA12
BrandSiemens
HK$150.78
Each
units
3 4NO/2NC Sentron Side Mount 6 A - - Screw - - - 3VA - -
RS Stock No. 711-6382
Mfr. Part No.CA4-40U
BrandABB
HK$178.35
Each
units
4 4NO - Front Mount 6 A 600 V dc, 690 V ac 4P Screw - - - CA4 - -
RS Stock No. 187-908
Mfr. Part No.LADN11G
HK$74.18
Each
units
2 NO/NC - Front Mount 10 A 690 V ac DP Screw -5°C +60°C -5 → +60 °C LADN - -
RS Stock No. 746-0806
Mfr. Part No.3RH2921-1DA02
BrandSiemens
HK$101.13
Each
units
2 2NC Sirius Innovation Lateral 10 A 600 V dc, 690 V ac DP Screw - - -25 +60 °C 3RH2 - -
RS Stock No. 776-2950
Mfr. Part No.A9N26899
HK$438.84
Each
units
2 NO/NC Acti 9 DIN Rail Mount 2 mA 24 V dc DPDT Cage Clamp -25°C +60°C -25 +60 °C Ti24 - -
RS Stock No. 759-055
Mfr. Part No.LA1KN22
HK$139.57
Each
units
4 2NO/2NC TeSys Clip On 10 A 600 V ac 4P Screw - - -25 → 50 °C LA1K - -
RS Stock No. 122-0946
Mfr. Part No.BFCA-02
BrandWEG
HK$61.84
Each
units
2 2NC - Front Mount 10 A 690 V ac DPST Screw - - -25 → +55 °C BFCA - -
RS Stock No. 454-8152
Mfr. Part No.NZM1-XHIV
BrandEaton
HK$370.20
Each
units
2 2NO - - 3 A dc, 4 A ac 220 V dc, 500 V ac DP Screw - - - NZM1 - -
RS Stock No. 445-0421
Mfr. Part No.1SAM201902R1001
BrandABB
HK$84.98
Each
units
2 NO/NC - Side Mount 2 A dc, 6 A ac 220 V dc, 400 V ac DP - - - - HK1 - -
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 - -
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