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. 610-0140
Mfr. Part No.VZ15
HK$203.40
Each
units
- - - Side Mount 63 A - - - - - - VZ15 - -
RS Stock No. 706-0951
Mfr. Part No.3RH2911-2FB22
BrandSiemens
HK$203.33
Each
units
4 2NO/2NC Sirius Innovation Snap-On 6 A dc, 10 A ac 250 V dc, 690 V ac 4PST Cage Clamp -25°C +60°C -25 +60 °C - - -
RS Stock No. 706-0885
Mfr. Part No.3RH2911-1FA40
BrandSiemens
HK$113.68
Each
units
4 4NO Sirius Innovation Snap-On 6 A dc, 10 A ac 250 V dc, 690 V ac 4PST Screw -25°C +60°C -25 +60 °C 3RH2 - -
RS Stock No. 445-8273
Mfr. Part No.CAF6-20M
BrandABB
HK$87.52
Each
units
2 2NO - Front Mount - 240 V dc, 500 V ac DP Screw - - - CAF6 - -
RS Stock No. 373-2261
Mfr. Part No.YM-180
HK$116.69
Each
units
- - - - - - - - - - - - - -
RS Stock No. 706-0983
Mfr. Part No.3RH2911-2HA21
BrandSiemens
HK$88.66
Each
units
3 2NO/NC 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. 122-0928
Mfr. Part No.BFC0-11
BrandWEG
HK$61.84
Each
units
2 NO/NC - Front Mount 10 A 690 V ac DPST Screw - - -25 → +55 °C BFC0 - -
RS Stock No. 513-4372
Mfr. Part No.DILM150-XHIA11
BrandEaton
HK$70.13
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. 901-0854
Mfr. Part No.11BGX1011
BrandLovato
HK$79.51
Each
units
2 NO/NC - DIN Rail Mount 10 A 690 V DPST Screw - - - BG - -
RS Stock No. 373-2211
Mfr. Part No.YM-50
HK$45.30
Each
units
- - - - - - - - - - - YM 50 x 45 x 30mm 50 mm
RS Stock No. 272-864
Mfr. Part No.GVAED101
HK$559.11
Each
units
2 2NO - Front Mount - - DP - - - - GVAE - -
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. 708-1810
Mfr. Part No.GS1AM110
HK$146.07
Each
units
1 NO - Top 10 A 600 V ac SP - - - - GS1A - -
RS Stock No. 866-1559
Mfr. Part No.XTCEXSAB10
BrandEaton
HK$150.78
Each
units
1 NO - Side Mount 16 A - SPST Screw - +50°C - - - -
RS Stock No. 608-8775
Mfr. Part No.GV7AC01
HK$228.34
Each
units
- - - - - - - - - - - GV7A - -
RS Stock No. 176-5640
Mfr. Part No.DS2208-SR7U2100SGW
BrandZebra
HK$1,971.62
Each
units
- - - - - - - - - - - - - -
RS Stock No. 706-0894
Mfr. Part No.3RH2911-1HA01
BrandSiemens
HK$53.42
Each
units
1 NC Sirius Innovation Snap-On 6 A ac, 10 A dc 250 V dc, 690 V ac SPST Screw -25°C +60°C -25 +60 °C 3RH2 - -
RS Stock No. 243-7454
Mfr. Part No.3RH1911-1AA10
BrandSiemens
HK$46.68
Each
units
1 NO Sirius Classic Snap-On 6 A - SP Screw - - - 3RH1 - -
RS Stock No. 122-0932
Mfr. Part No.BFC025-02
BrandWEG
HK$61.84
Each
units
2 2NC - Front Mount 10 A 690 V ac DPST Screw - - -25 → +55 °C BFC025 - -
RS Stock No. 209-5577
Mfr. Part No.M5725104
BrandMETCASE
HK$682.17
Each
units
- - - - - - - - - - - Mettec 250 x 250 x 85mm 250 mm
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