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 Number of Timing Ranges External Dimensions
RS Stock No. 314-286
Mfr. Part No.3TX4010-2A
BrandSiemens
HK$53.65
Each
units
1 NO - Plug In 6 A - SP - - - - 3TX4 - -
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Mfr. Part No.LADN11
HK$91.64
Each
units
2 NO/NC TeSys Front Mount 10 A - DP Screw - - - LADN - -
RS Stock No. 373-2249
Mfr. Part No.YM-130
HK$69.05
Each
units
- - - - - - - - - - - - - -
RS Stock No. 394-9908
Mfr. Part No.LADN22
HK$162.17
Each
units
4 2NO/2NC TeSys Front Mount 10 A 600 V ac 4P Screw -5°C +60°C - LADN - -
RS Stock No. 791-2824
Mfr. Part No.A9A26924
HK$270.07
Each
units
1 NO/NC Acti 9 DIN Rail Mount 2 A dc, 6 A ac 24 → 130 V dc, 240 → 415 V ac SPCO Screw -35°C +70°C -35 → +70 °C iOF - -
RS Stock No. 246-5061
Mfr. Part No.3RV1901-1A
BrandSiemens
HK$89.59
Each
units
2 NO/NC Sirius Classic Side Mount 2 A 24 V ac DP Screw - +60°C Maximum of +60 °C 3RV1 - -
RS Stock No. 257-3752
Mfr. Part No.VZ7
HK$120.18
Each
units
2 NO/NC - - - - DP - - - - VZ7 - -
RS Stock No. 260-8987
Mfr. Part No.23021608
HK$1,461.72
Each
units
- - - - - - - - - - - - - -
RS Stock No. 394-9970
Mfr. Part No.LADN02
HK$65.71
Each
units
2 2NC - Front Mount - - DP Screw - - - LADN - -
RS Stock No. 818-277
Mfr. Part No.NHI11-PKZ0
BrandEaton
HK$112.10
Each
units
2 NO/NC - Side Mount 2 A dc, 3.5 A ac 220 V dc, 500 V ac DPST Screw - - - - - -
RS Stock No. 373-2255
Mfr. Part No.YM-150
HK$88.35
Each
units
- - - - - - - - - - - - - -
RS Stock No. 314-292
Mfr. Part No.3TX4001-2A
BrandSiemens
HK$47.65
Each
units
1 NC - Plug In 6 A - SP - - - - 3TX4 - -
RS Stock No. 685-1517
Mfr. Part No.BFX1022
BrandLovato
HK$100.97
Each
units
4 2NO/2NC - Snap-On - - - Screw - - - - - -
RS Stock No. 394-9879
Mfr. Part No.LADN40
HK$160.95
Each
units
4 4NO TeSys Front Mount 10 A - 4P Screw - - - LADN - -
RS Stock No. 395-0144
Mfr. Part No.GVAE11
HK$83.24
Each
units
2 NO/NC TeSys Front Mount 2.5 A 60 V dc, 240 V ac DP Screw - - - GVAE - -
RS Stock No. 400-1445
Mfr. Part No.LADS2
HK$495.47
Each
units
2 NO/NC TeSys Front Mount 10 A 690 V - Screw -5°C +60°C -5 → +60 °C D - -
RS Stock No. 394-9920
Mfr. Part No.LADN13
HK$115.36
Each
units
4 NO/3NC - Front Mount - - 4P Screw - - - LADN - -
RS Stock No. 685-1504
Mfr. Part No.BFX1011
BrandLovato
HK$47.05
Each
units
2 NO/NC - Snap-On - - - Screw - - - - - -
RS Stock No. 521-4579
Mfr. Part No.5ST3010
BrandSiemens
HK$211.92
Each
units
2 NO/NC Sentron DIN Rail Mount 6 A 230 V ac DP Screw -5°C +40°C -5 → +40 °C 5ST3 - -
RS Stock No. 392-8973
Mfr. Part No.3RH1921-1CA01
BrandSiemens
HK$45.01
Each
units
1 NC Sirius Classic Snap-On - - SP Screw - - - 3RH1 - -