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. 776-1563
Mfr. Part No.022.33
BrandFinder
MYR119.40
Each
units
2 2NO - DIN Rail Mount 6 A 230 V DPST Screw - - - 22 - -
RS Stock No. 122-0947
Mfr. Part No.BFCA-04
BrandWEG
MYR67.86
Each
units
4 4NC - Front Mount 10 A 690 V ac 4PST Screw - - -25 → +55 °C BFCA - -
RS Stock No. 209-5864
Mfr. Part No.M5735207
BrandMETCASE
MYR451.44
Each
units
- - - - - - - - - - - Mettec 250 mm 350 x 250 x 120mm
New
RS Stock No. 211-2550
Mfr. Part No.LA1DX11
MYR303.29
Each
units
- 1 NO (sealed) + 1 NC (sealed) TeSys D DIN - 125 V - - - - - LA1D - -
RS Stock No. 706-0964
Mfr. Part No.3RH2911-2HA01
BrandSiemens
MYR31.15
Each
units
1 NC Sirius Innovation Snap-On 6 A ac, 10 A dc 250 V dc, 690 V ac SPST Cage Clamp -25°C +60°C -25 → +60 °C 3RH2 - -
RS Stock No. 209-5606
Mfr. Part No.M5716107
BrandMETCASE
MYR313.50
Each
units
- - - - - - - - - - - Mettec 130 mm 160 x 130 x 85mm
RS Stock No. 454-8152
Mfr. Part No.259426 & NZM1-XHIV
BrandEaton
MYR214.20
Each
units
2 2NO - - 3 A dc, 4 A ac 220 V dc, 500 V ac DP Screw - - - NZM1 - -
RS Stock No. 262-0971
Mfr. Part No.LA1SK20
MYR55.91
Each
units
2 2NO - Clip On - - DP Screw - - - LA1S - -
RS Stock No. 209-6463
Mfr. Part No.M5735104
BrandMETCASE
MYR550.03
Each
units
- - - - - - - - - - - Mettec 250 mm 350 x 250 x 85mm
RS Stock No. 513-4372
Mfr. Part No.283463 & DILM150-XHIA11
BrandEaton
MYR38.71
Each
units
2 NO/NC - Front Mount 4 A ac, 10 A dc 220 V dc, 500 V ac DPST Screw -25°C +60°C -25 → +60 °C DILM - -
RS Stock No. 706-0933
Mfr. Part No.3RH2911-2DA11
BrandSiemens
MYR51.08
Each
units
2 NO/NC Sirius Innovation Snap-On 10 A 250 V dc, 690 V ac DPST Cage Clamp -25°C +60°C -25 → +60 °C - - -
RS Stock No. 706-0866
Mfr. Part No.3RH2911-1BA10
BrandSiemens
MYR31.00
Each
units
1 NO 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. 122-0951
Mfr. Part No.BFCA-22
BrandWEG
MYR75.40
Each
units
4 2NO/2NC - Front Mount 10 A 690 V ac 4PST Screw - - -25 → +55 °C BFCA - -
New
RS Stock No. 211-2620
Mfr. Part No.LADN11P
MYR44.18
Each
units
- 1NC/1NO TeSys DIN - 690 V - - - - - LADN - -
RS Stock No. 512-9516
Mfr. Part No.OA3G01
BrandABB
MYR46.70
Each
units
- - - - - - - - - - - - - -
RS Stock No. 706-0891
Mfr. Part No.3RH2911-1FC22
BrandSiemens
MYR162.67
Each
units
4 2NO/2NC 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. 610-3537
Mfr. Part No.3LD9200-5C
BrandSiemens
MYR82.66
Each
units
2 NO/NC - Floor - - DP - - - - - - -
New
RS Stock No. 211-3823
Mfr. Part No.5ST3014-2
BrandSiemens
MYR224.31
Each
units
2 2NO SENTRON DIN - - - - - - - 5ST3 - -
RS Stock No. 124-3129
Mfr. Part No.5ST3021
BrandSiemens
MYR184.30
Each
units
- - Sentron - - - - - - - - 5ST3 - -
New
RS Stock No. 213-1398
Mfr. Part No.3NW7902
BrandSiemens
MYR98.99
Each
units
1 CO SENTRON - - - - - - - - 3NW - -