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 Width External Dimensions
RS Stock No. 394-9879
Mfr. Part No.LADN40
MYR107.64
Each
units
4 4NO TeSys Front Mount 10 A - 4P Screw - - - LADN - -
RS Stock No. 395-0352
Mfr. Part No.GV2AF3
MYR26.12
Each
units
- - - - - - - - - - - GV2A - -
RS Stock No. 521-4579
Mfr. Part No.5ST3010
BrandSiemens
MYR123.36
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. 445-7983
Mfr. Part No.GHE3401321R0002
BrandABB
MYR130.93
Each
units
2 NO/NC - DIN Rail Mount - 220 V dc, 400 V ac DP Screw -25°C +55°C -25 → +55 °C ESB - -
RS Stock No. 493-0652
Mfr. Part No.277377 & DILM32-XHI22
BrandEaton
MYR67.48
Each
units
4 2NO/2NC - Front Mount 4 A ac, 10 A dc 220 V dc, 500 V ac 4PST Screw - - - DILM - -
RS Stock No. 333-546
Mfr. Part No.78819020 & HI11-P1/P3Z(RS333-546)
BrandEaton
MYR71.00
Each
units
2 NO/NC - Side Mount 10 A - - Screw - +50°C - - - -
RS Stock No. 394-9914
Mfr. Part No.LADN20
MYR93.37
Each
units
2 2NO TeSys Front Mount 10 A - DP Screw - - - LADN - -
RS Stock No. 395-0100
Mfr. Part No.GVAN20
MYR60.77
Each
units
2 2NO - Side Mount - 240 V dc, 690 V ac DP Screw - - - GVAN - -
RS Stock No. 818-283
Mfr. Part No.072894 & NHI21-PKZ0
BrandEaton
MYR98.94
Each
units
3 2NO/NC - Side Mount 2 A dc, 3.5 A ac 220 V dc, 500 V ac 3PST Screw - - - - - -
RS Stock No. 395-0122
Mfr. Part No.GVAN11
MYR46.16
Each
units
2 NO/NC TeSys Side Mount 6 A 240 V dc, 690 V ac DP Screw - - - GVAN - -
RS Stock No. 746-0800
Mfr. Part No.3RH2921-1DA11
BrandSiemens
MYR80.42
Each
units
2 NO/NC Sirius Innovation Lateral 10 A 600 V dc, 690 V ac DP Screw - - -25 → +60 °C 3RH2 - -
RS Stock No. 394-9885
Mfr. Part No.LADN31
MYR88.70
Each
units
4 3NO/NC TeSys Front Mount 10 A - 4P Screw -5°C +60°C - LADN - -
RS Stock No. 493-9110
MYR58.62
Each
units
2 NO/NC TeSys U Series - 5 A 24 → 250 V ac/dc - - - - - - - -
RS Stock No. 395-0144
Mfr. Part No.GVAE11
MYR46.42
Each
units
2 NO/NC TeSys Front Mount 2.5 A 60 V dc, 240 V ac DP Screw - - - GVAE - -
RS Stock No. 759-055
Mfr. Part No.LA1KN22
MYR69.20
Each
units
4 2NO/2NC TeSys Clip On 10 A 600 V ac 4P Screw - - -25 → 50 °C LA1K - -
RS Stock No. 244-0107
Mfr. Part No.082882 & NHI-E-11-PKZ0
BrandEaton
MYR63.52
Each
units
2 NO/NC - Front Mount 1 A ac, 2 A dc 24 V dc, 240 V ac DPST Screw - - - - - -
RS Stock No. 922-7210
Mfr. Part No.286054 & FAZ-XHIN11
BrandEaton
MYR123.46
Each
units
2 1NO/1NC - DIN Rail Mount 3 A ac, 500 mA dc 120 V dc, 240 V ac SPDT Screw - - - FAZ - -
RS Stock No. 445-8043
Mfr. Part No.1SBN010040R1122 - CA5-22M
BrandABB
MYR191.41
Each
units
4 2NO/2NC - Front Mount 6 A 24 V dc, 230 V ac 4P Screw - - - CA5 - -
RS Stock No. 209-5820
Mfr. Part No.M5725207
BrandMETCASE
MYR369.86
Each
units
- - - - - - - - - - - Mettec 250 mm 250 x 250 x 120mm
RS Stock No. 493-9126
Mfr. Part No.LUFN20
MYR59.71
Each
units
2 2NO TeSys U Series - 5 A 24 → 250 V ac/dc - - - - - - - -