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. 209-5533
Mfr. Part No.M5723104
BrandMETCASE
TWD2,843.00
Each
units
- - - - - - - - - - - Mettec 180 mm 230 x 180 x 85mm
RS Stock No. 711-6363
Mfr. Part No.1SBN010140R1131 CA4-31M
BrandABB
TWD702.00
Each
units
4 3NO/NC - Front Mount 6 A 600 V dc, 690 V ac 4P Screw - - - CA4 - -
RS Stock No. 382-191
Mfr. Part No.LA1KN317
TWD567.00
Each
units
4 3NO/NC - Clip On - - 4P Screw - - - LA1K - -
RS Stock No. 482-487
Mfr. Part No.DF22AM1
TWD379.00
Each
units
1 - - DIN Rail Mount 125 A - SP - - - - DF22 - -
RS Stock No. 209-5606
Mfr. Part No.M5716107
BrandMETCASE
TWD2,260.00
Each
units
- - - - - - - - - - - Mettec 130 mm 160 x 130 x 85mm
RS Stock No. 791-2837
Mfr. Part No.A9A26927
TWD1,442.00
Each
units
1 NO/NC Acti 9 DIN Rail Mount 2 A dc, 6 A ac 24 → 130 V dc, 240 → 415 V ac DP Screw -35°C +70°C -35 → +70 °C iSD - -
RS Stock No. 776-2932
Mfr. Part No.A9N26959
TWD3,604.00
Each
units
- - Acti 9 - - - - - - - - iC60 - -
RS Stock No. 178-8011
Mfr. Part No.139580 & DILA-XHIR22
BrandEaton
TWD1,221.00
Each
units
4 2NO/2NC - Front Mount 4 A ac, 10 A dc 220 V dc, 500 V ac 4P Screw -25°C +60°C -25 → +60 °C DILA - -
RS Stock No. 445-8093
Mfr. Part No.GHE3401321R0001
BrandABB
TWD983.00
Each
units
2 2NO - DIN Rail Mount 4 A 220 V dc, 400 V ac DP Screw -25°C +55°C -25 → +55 °C ESB - -
RS Stock No. 209-5921
Mfr. Part No.M5735317
BrandMETCASE
TWD5,774.00
Each
units
- - - - - - - - - - - Mettec 263 mm 350 x 263 x 150mm
RS Stock No. 122-0944
Mfr. Part No.BFC4-31
BrandWEG
TWD483.00
Each
units
4 3NO/1NC - Front Mount 10 A 690 V ac 4PST Screw - - -25 → +55 °C BFC4 - -
RS Stock No. 136-3685
Mfr. Part No.3RH2911-1XA31-0MA0
BrandSiemens
TWD645.00
Each
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4 3NO/1NC 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. 608-8999
Mfr. Part No.LA1LC012
TWD5,512.00
Each
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5 4NO/NC - Side Mount - - 5P Screw - - - LA1L - -
New
RS Stock No. 213-1025
Mfr. Part No.3TY2781-2D
BrandSiemens
TWD2,601.00
Each
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4 2NO+2NC SIRIUS Snap-On 10 A 690 V - - - - - - - -
New
RS Stock No. 214-6828
Mfr. Part No.J73KN-A-11
BrandOmron
TWD291.00
Each
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2 1NC/1NO - - 25 A 690 V - - - - - J73KN - -
RS Stock No. 178-7895
Mfr. Part No.LV426951
TWD963.00
Each
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1 1CO - Clip On 5 A 110 V dc, 690 V ac - Pre-Wire - - - - - -
RS Stock No. 813-9415
Mfr. Part No.LADN226
TWD1,844.00
Each
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8 2NO/2NC - Front Mount 10 A 690 V ac 4P Lug Ring -40°C +70°C -40 → +70 °C - - -
RS Stock No. 706-0945
Mfr. Part No.3RH2911-2FA04
BrandSiemens
TWD645.00
Each
units
4 4NC Sirius Innovation Snap-On 6 A ac, 10 A dc 250 V dc, 690 V ac 4PST Cage Clamp -25°C +60°C -25 → +60 °C 3RH2 - -
RS Stock No. 758-484
Mfr. Part No.K2 H010/A11-VE
TWD588.00
Each
units
2 NO/NC - Side Mount 80 A, 100 A - DP - - - - - - -
RS Stock No. 124-3128
Mfr. Part No.5ST3020
BrandSiemens
TWD1,190.00
Each
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- - Sentron - - - - - - - - 5ST3 - -