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. 314-292
Mfr. Part No.3TX4001-2A
BrandSiemens
HK$65.85
Each
units
1 NC - Plug In 6 A - SP - - - - 3TX4 - -
RS Stock No. 706-0879
Mfr. Part No.3RH2911-1DA11
BrandSiemens
HK$154.70
Each
units
2 NO/NC Sirius Innovation Snap-On 10 A 250 V dc, 690 V ac DPST Screw -25°C +60°C -25 → +60 °C - - -
RS Stock No. 392-8973
Mfr. Part No.3RH1921-1CA01
BrandSiemens
HK$55.29
Each
units
1 NC Sirius Classic Snap-On - - SP Screw - - - 3RH1 - -
RS Stock No. 521-4579
Mfr. Part No.5ST3010
BrandSiemens
HK$366.24
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. 392-8967
Mfr. Part No.3RH1921-1CA10
BrandSiemens
HK$64.00
Each
units
1 NO Sirius Classic Snap-On - - SP Screw - - - 3RH1 - -
RS Stock No. 874-4534
Mfr. Part No.3VA9988-0AA11
BrandSiemens
HK$402.86
Each
units
6 4NO/2NC Sentron Side Mount 10 A - - Screw - - - 3VA - -
RS Stock No. 746-0800
Mfr. Part No.3RH2921-1DA11
BrandSiemens
HK$154.70
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. 521-4591
Mfr. Part No.5ST3012
BrandSiemens
HK$207.34
Each
units
2 2NC Sentron DIN Rail Mount 6 A 230 V ac DP Screw -5°C +40°C -5 → +40 °C 5ST3 - -
RS Stock No. 706-1917
Mfr. Part No.3RV2901-2E
BrandSiemens
HK$120.84
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. 706-0850
Mfr. Part No.3RH2911-1AA01
BrandSiemens
HK$77.76
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. 136-3695
Mfr. Part No.3RH2911-2XA40-0MA0
BrandSiemens
HK$172.96
Each
units
4 4NO 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. 202-7062
Mfr. Part No.5ST3010-2
BrandSiemens
HK$246.01
Each
units
2 1NO/1NC SENTRON DIN Rail Mount - - - - - - - 5ST3 - -
RS Stock No. 706-0854
Mfr. Part No.3RH2911-1AA10
BrandSiemens
HK$79.48
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 - -
New
RS Stock No. 213-1384
Mfr. Part No.3LD9200-6C
BrandSiemens
HK$178.33
Each
units
2 2 NO SENTRON Floor mounting - - - - - - - 3LD - -
RS Stock No. 706-0860
Mfr. Part No.3RH2911-1DA02
BrandSiemens
HK$89.56
Each
units
2 2NC Sirius Innovation Snap-On 10 A 250 V dc, 690 V ac DPST Screw -25°C +60°C -25 → +60 °C - - -
New
RS Stock No. 216-4807
Mfr. Part No.5ST3012-2
BrandSiemens
HK$235.89
Each
units
2 2NC SENTRON DIN - - - - - - - 5ST3 - -
RS Stock No. 203-2076
Mfr. Part No.3RH1921-2DE11
BrandSiemens
HK$386.22
Each
units
2 1NO/1NC SIRIUS Snap-On 10 A 17 V dc - - - - - 3RH1921 - -
RS Stock No. 136-3696
Mfr. Part No.3RH2911-4DA11
BrandSiemens
HK$101.61
Each
units
2 1NO/1NC Sirius Innovation Snap-On 10 A 600 V dc, 690 V ac DPST Ring Cable -25°C +60°C -25 → +60 °C 3RH29 - -
New
RS Stock No. 216-5970
Mfr. Part No.3NP1920-1FA00
BrandSiemens
HK$82.31
Each
units
1 1 CO SENTRON - - - - - - - - 3NP1 - -
RS Stock No. 746-0718
Mfr. Part No.3RH1921-1JA11
BrandSiemens
HK$146.10
Each
units
2 NO/NC Sirius Classic Lateral - - DP Screw - - - 3RH1 - -