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庫存編號 314-292
製造零件編號3TX4001-2A
BrandSiemens
HK$65.85
單位
1 NC - Plug In 6 A - SP - - - - 3TX4 - -
RS庫存編號 392-8973
製造零件編號3RH1921-1CA01
BrandSiemens
HK$55.97
單位
1 NC Sirius Classic Snap-On - - SP Screw - - - 3RH1 - -
RS庫存編號 521-4579
製造零件編號5ST3010
BrandSiemens
HK$366.24
單位
2 NO/NC Sentron DIN Rail Mount 6 A 230 V ac DP Screw -5°C +40°C -5 → +40 °C 5ST3 - -
RS庫存編號 706-0879
製造零件編號3RH2911-1DA11
BrandSiemens
HK$154.70
單位
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庫存編號 746-0800
製造零件編號3RH2921-1DA11
BrandSiemens
HK$154.70
單位
2 NO/NC Sirius Innovation Lateral 10 A 600 V dc, 690 V ac DP Screw - - -25 → +60 °C 3RH2 - -
RS庫存編號 392-8967
製造零件編號3RH1921-1CA10
BrandSiemens
HK$64.00
單位
1 NO Sirius Classic Snap-On - - SP Screw - - - 3RH1 - -
RS庫存編號 521-4591
製造零件編號5ST3012
BrandSiemens
HK$207.34
單位
2 2NC Sentron DIN Rail Mount 6 A 230 V ac DP Screw -5°C +40°C -5 → +40 °C 5ST3 - -
RS庫存編號 706-1917
製造零件編號3RV2901-2E
BrandSiemens
HK$120.84
單位
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庫存編號 874-4534
製造零件編號3VA9988-0AA11
BrandSiemens
HK$402.86
單位
6 4NO/2NC Sentron Side Mount 10 A - - Screw - - - 3VA - -
RS庫存編號 706-0977
製造零件編號3RH2911-2HA12
BrandSiemens
HK$139.66
單位
3 NO/2NC Sirius Innovation Snap-On 6 A ac, 10 A dc 250 V dc, 690 V ac 3PST Cage Clamp -25°C +60°C -25 → +60 °C - - -
RS庫存編號 746-0718
製造零件編號3RH1921-1JA11
BrandSiemens
HK$146.10
單位
2 NO/NC Sirius Classic Lateral - - DP Screw - - - 3RH1 - -
RS庫存編號 746-0799
製造零件編號3RH2911-1GA31
BrandSiemens
HK$172.96
單位
4 3NO/NC Sirius Innovation Snap Front 10 A 600 V dc, 690 V ac 4P Screw - - -25 → +60 °C 3RH2 - -
RS庫存編號 202-7252
製造零件編號5ST3010-0HG
BrandSiemens
HK$232.05
單位
2 1NO/1NC SENTRON DIN Rail Mount - 440 V - - - - - 5ST3 - -
RS庫存編號 706-0983
製造零件編號3RH2911-2HA21
BrandSiemens
HK$139.66
單位
3 2NO/NC 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 - - -
全新
RS庫存編號 212-5835
製造零件編號3LD9340-6B
BrandSiemens
HK$135.36
單位
2 1 NO + 1 NC SENTRON Front mounting - - - - - - - 3LD - -
RS庫存編號 706-0914
製造零件編號3RH2911-1HA12
BrandSiemens
HK$139.66
單位
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 - -
RS庫存編號 392-7548
製造零件編號3RH1911-2FA20
BrandSiemens
HK$133.21
單位
2 2NO Sirius Classic Snap-On - - DP Cage Clamp - - - 3RH1 - -
全新
RS庫存編號 212-5837
製造零件編號3LD9340-6C
BrandSiemens
HK$135.36
單位
2 1 NO + 1 NC SENTRON Floor mounting - - - - - - - 3LD - -
RS庫存編號 124-3128
製造零件編號5ST3020
BrandSiemens
HK$319.07
單位
- - Sentron - - - - - - - - 5ST3 - -
RS庫存編號 203-2097
製造零件編號3RH2911-2GA22
BrandSiemens
HK$172.96
單位
4 2NO/2NC SIRIUS Snap-On 10 A 17 V dc - - - - - 3RH2911 - -