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. 122-0784
Mfr. Part No.TSB
BrandWEG
MYR151.00
Each
units
4 2NO/2NC - Side Mount 10 A 690 V ac 4PST Screw - - -20 → +70 °C TSB - -
RS Stock No. 776-1572
Mfr. Part No.022.35
BrandFinder
MYR116.81
Each
units
1 NO/NC - DIN Rail Mount 6 A 230 V DPST Screw - - - 22 - -
RS Stock No. 363-5766
Mfr. Part No.LA1KN223
MYR95.38
Each
units
4 2NO/2NC - Clip On 10 A 600 V ac 4P Cage Clamp - - - LA1K - -
RS Stock No. 202-7252
Mfr. Part No.5ST3010-0HG
BrandSiemens
MYR134.04
Each
units
2 1NO/1NC SENTRON DIN Rail Mount - 440 V - - - - - 5ST3 - -
RS Stock No. 901-0851
Mfr. Part No.11BGX1002
BrandLovato
MYR48.74
Each
units
2 2NC - DIN Rail Mount 10 A 690 V DPST Screw - - - BG - -
RS Stock No. 706-0961
Mfr. Part No.3RH2911-2HA03
BrandSiemens
MYR52.23
Each
units
3 3NC Sirius Innovation Snap-On 6 A dc, 10 A ac 250 V dc, 690 V ac 3PST Cage Clamp -25°C +60°C -25 → +60 °C - - -
RS Stock No. 454-8152
Mfr. Part No.259426 & NZM1-XHIV
BrandEaton
MYR243.08
Each
units
2 2NO - - 3 A dc, 4 A ac 220 V dc, 500 V ac DP Screw - - - NZM1 - -
RS Stock No. 706-1917
Mfr. Part No.3RV2901-2E
BrandSiemens
MYR71.13
Each
units
2 NO/NC Sirius Innovation Plug In 1 A dc, 2.5 A ac 60 V dc, 230 V ac DP Cage Clamp -20°C +60°C -20 → +60 °C - - -
RS Stock No. 759-049
Mfr. Part No.LA1KN40
MYR60.58
Each
units
4 4NO - Clip On 10 A 600 V ac 4P Screw - - - LA1K - -
RS Stock No. 122-9423
Mfr. Part No.3RH2911-1MA20
BrandSiemens
MYR66.09
Each
units
2 2NO Sirius Innovation Snap-On 10 A 690 V DP Screw -25°C +60°C -25 → +60 °C 3RH2 - -
RS Stock No. 706-0854
Mfr. Part No.3RH2911-1AA10
BrandSiemens
MYR47.14
Each
units
1 NO Sirius Innovation Snap-On 6 A dc, 10 A ac 250 V dc, 690 V ac SPST Screw -25°C +60°C -25 → +60 °C 3RH2 - -
RS Stock No. 608-8983
Mfr. Part No.LA1LC010
MYR1,606.01
Each
units
6 5NO/NC - Side Mount - - 6P Screw - - - LA1L - -
RS Stock No. 136-3690
BrandSiemens
MYR99.91
Each
units
4 1NO/3NC Sirius Innovation Snap-On 10 A 600 V dc, 690 V ac 4PST Spring Load -25°C +60°C -25 → +60 °C 3RH29 - -
RS Stock No. 706-0850
Mfr. Part No.3RH2911-1AA01
BrandSiemens
MYR47.14
Each
units
1 NC 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. 260-8987
Mfr. Part No.23021608
MYR956.88
Each
units
- - - - - - - - - - - - - -
RS Stock No. 685-1517
Mfr. Part No.BFX1022
BrandLovato
MYR106.04
Each
units
4 2NO/2NC - Snap-On - - - Screw - - - - - -
RS Stock No. 706-0973
Mfr. Part No.3RH2911-2HA11
BrandSiemens
MYR60.17
Each
units
2 NO/NC Sirius Innovation Snap-On 6 A dc, 10 A ac 250 V dc, 690 V ac DPST Cage Clamp -25°C +60°C -25 → +60 °C - - -
RS Stock No. 610-1064
Mfr. Part No.GV1G02
MYR33.87
Each
units
- - - - - - - - - - - GV1G - -
RS Stock No. 122-0932
Mfr. Part No.BFC025-02
BrandWEG
MYR46.29
Each
units
2 2NC - Front Mount 10 A 690 V ac DPST Screw - - -25 → +55 °C BFC025 - -
RS Stock No. 706-0914
Mfr. Part No.3RH2911-1HA12
BrandSiemens
MYR81.83
Each
units
3 NO/2NC Sirius Innovation Snap-On 6 A ac, 10 A dc 250 V dc, 690 V ac 3PST Screw -25°C +60°C -25 → +60 °C 3RH2 - -