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. 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. 373-2233
Mfr. Part No.YM-100
HK$61.55
Each
units
- - - - - - - - - - - - - -
RS Stock No. 743-4992
Mfr. Part No.DILM32-XHI11-S
BrandEaton
HK$153.07
Each
units
2 NO/NC - Side Mount 4 A ac, 10 A dc 220 V dc, 500 V ac DP Screw - - - DILM - -
RS Stock No. 363-5766
Mfr. Part No.LA1KN223
HK$153.30
Each
units
4 2NO/2NC - Clip On 10 A 600 V ac 4P Cage Clamp - - - LA1K - -
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. 122-0934
Mfr. Part No.BFC025-20
BrandWEG
HK$61.26
Each
units
2 2NO - Front Mount 10 A 690 V ac DPST Screw - - -25 → +55 °C BFC025 - -
RS Stock No. 192-0814
Mfr. Part No.66427
BrandABB
HK$1,222.02
Each
units
3 CO - DIN Rail Mount - 250 V ac/dc SPDT - - - - - - -
RS Stock No. 187-891
Mfr. Part No.LADN01
HK$104.60
Each
units
1 NC - Front Mount 10 A 690 V ac SP Screw -5°C +60°C -5 → +60 °C LADN - -
RS Stock No. 257-3768
Mfr. Part No.VZ11
HK$120.31
Each
units
- - - Side Mount 32 A - - - - - - VZ11 - -
RS Stock No. 122-0940
Mfr. Part No.BFC4-11
BrandWEG
HK$66.44
Each
units
2 NO/NC - Front Mount 10 A 690 V ac DPST Screw - - -25 → +55 °C BFC4 - -
RS Stock No. 706-1881
Mfr. Part No.3RV2901-1B
BrandSiemens
HK$85.69
Each
units
2 2NO Sirius Innovation Plug In 2 A dc, 10 A ac 250 V dc, 690 V ac DP Screw -20°C +60°C -20 +60 °C 3RV2 - -
RS Stock No. 706-1891
Mfr. Part No.3RV2901-1F
BrandSiemens
HK$85.69
Each
units
2 2NO 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 - - -
RS Stock No. 279-6321
Mfr. Part No.LA1KN13
HK$118.77
Each
units
4 NO/3NC - Clip On 10 A 600 V ac 4P Screw - - - LA1K - -
RS Stock No. 194-6338
Mfr. Part No.1SBN010013R1010
BrandABB
HK$58.62
Each
units
1 NO - Front Mount 6 A 127 V - Screw - - - - - -
RS Stock No. 608-9138
Mfr. Part No.LADC22
HK$149.91
Each
units
4 2NO/2NC - Front Mount - - 4P Screw - - - LADC - -
RS Stock No. 257-3724
Mfr. Part No.VZ3
HK$187.62
Each
units
1 - - Side Mount 50 A 690 V ac SP Screw -20°C +50°C -20 → +50 °C VZ3 - -
RS Stock No. 513-0207
Mfr. Part No.DILM150-XHI40
BrandEaton
HK$118.63
Each
units
4 4NO - Front Mount 4 A ac, 10 A dc 220 V dc, 500 V ac 4PST Screw - - - DILM - -
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. 513-0190
Mfr. Part No.DILM150-XHI02
BrandEaton
HK$70.13
Each
units
2 2NC - Front Mount 4 A ac, 10 A dc 220 V dc, 500 V ac DPST Screw - - - DILM - -
RS Stock No. 121-6873
BrandRS PRO
HK$25.22
Each
units
- - - DIN Rail Mount - - - Screw -25°C +60°C -25 +60 °C MSK - -
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