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 Dimensions External Length
RS Stock No. 746-0705
Mfr. Part No.3RH1921-1HA22
BrandSiemens
MYR72.22
Each
units
4 2NO/2NC Sirius Classic Snap Front - - 4P Screw - - - 3RH1 - -
RS Stock No. 735-2715
Mfr. Part No.3SB1400-0A
BrandSiemens
MYR79.74
Each
units
2 NO/NC - Front Mount 10 A 220 V dc, 400 V ac DPST Screw -25°C +70°C -25 → +70 °C - - -
RS Stock No. 314-292
Mfr. Part No.3TX4001-2A
BrandSiemens
MYR36.33
Each
units
1 NC - Plug In 6 A - SP - - - - 3TX4 - -
RS Stock No. 521-4579
Mfr. Part No.5ST3010
BrandSiemens
MYR164.60
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. 746-0800
Mfr. Part No.3RH2921-1DA11
BrandSiemens
MYR59.59
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. 706-0999
Mfr. Part No.3RH2911-2HA31
BrandSiemens
MYR66.66
Each
units
4 3NO/NC 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 - - -
RS Stock No. 392-8973
Mfr. Part No.3RH1921-1CA01
BrandSiemens
MYR20.08
Each
units
1 NC Sirius Classic Snap-On - - SP Screw - - - 3RH1 - -
RS Stock No. 746-0783
Mfr. Part No.3RH2911-1GA04
BrandSiemens
MYR66.66
Each
units
4 4NC Sirius Innovation Snap Front 10 A 600 V dc, 690 V ac 4P Screw - - -25 +60 °C 3RH2 - -
RS Stock No. 874-4534
Mfr. Part No.3VA9988-0AA11
BrandSiemens
MYR161.29
Each
units
6 4NO/2NC Sentron Side Mount 10 A - - Screw - - - 3VA - -
RS Stock No. 392-8967
Mfr. Part No.3RH1921-1CA10
BrandSiemens
MYR23.63
Each
units
1 NO Sirius Classic Snap-On - - SP Screw - - - 3RH1 - -
RS Stock No. 746-0796
Mfr. Part No.3RH2911-1GA22
BrandSiemens
MYR66.66
Each
units
4 2NO/2NC Sirius Innovation Snap Front 10 A 600 V dc, 690 V ac 4P Screw - - -25 +60 °C 3RH2 - -
RS Stock No. 751-5916
Mfr. Part No.3RT1966-4G
BrandSiemens
MYR486.99
Each
units
- - Sirius Classic - - - - - - - - 3RT1 - -
RS Stock No. 122-9425
Mfr. Part No.3RH2911-2GA31
BrandSiemens
MYR66.66
Each
units
4 3NO/NC Sirius Innovation Snap-On 10 A 690 V 4PST Cage Clamp -25°C +60°C -25 → +60 °C 3RH2 - -
RS Stock No. 706-0917
Mfr. Part No.3RH2911-1HA13
BrandSiemens
MYR66.66
Each
units
4 NO/3NC 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. 246-5061
Mfr. Part No.3RV1901-1A
BrandSiemens
MYR54.96
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. 706-1897
Mfr. Part No.3RV2901-1E
BrandSiemens
MYR50.48
Each
units
2 NO/NC Sirius Innovation Plug In 1 A dc, 2.5 A ac 60 V dc, 230 V ac DP Screw -20°C +60°C -20 → +60 °C 3RV2 - -
RS Stock No. 246-4507
Mfr. Part No.3RH1921-1FA22
BrandSiemens
MYR58.84
Each
units
4 2NO/2NC - Front Mount 6 A - 4P Screw - - - 3RH1 - -
RS Stock No. 706-0908
Mfr. Part No.3RH2911-1HA03
BrandSiemens
MYR52.23
Each
units
3 3NC Sirius Innovation Snap-On 6 A dc, 10 A ac 250 V dc, 690 V ac 3PST Screw -25°C +60°C -25 +60 °C - - -
RS Stock No. 751-5714
Mfr. Part No.3RT1916-2FK21
BrandSiemens
MYR373.88
Each
units
2 NO/NC Sirius Classic DIN Rail Mount - - - Screw -25°C +60°C -25 +60 °C 3RT1 - -
RS Stock No. 124-3139
Mfr. Part No.5ST3045
BrandSiemens
MYR401.55
Each
units
- - Sentron - - - - - - - - 5ST3 - -