Auxiliary Contacts

Auxiliary contacts, also known as auxiliary contactors are electromechanical devices used in conjunction with primary switching equipment such as contactors, circuit breakers, switches, and relays. These secondary switching devices are physically connected to the main switching equipment and work at the same time. The add-on accessories are available in a range of contact configurations and mounting styles to suit a wide range of industrial control applications.RS Components offer an extensive range of high-quality auxiliary contact blocks from industry-leading brands including Schneider Electric, Siemens, ABB, Lovato, Eaton, and of course RS Pro.

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. Auxiliary contacts are available in a variety of mounting styles such as a front mount or DIN rail mount and a range of terminal types including screw terminals, screw clamp terminals, and cage clamp terminals making it easy to find the right contact for the application.

What are auxiliary contacts used for?

One common usage of auxiliary contacts is in push-button controllers, where they can be built into the start button. They are a common component in relay logic circuits solid-state electronics, electric motors, motor control schemes, and other industrial control applications.

What are the different types of contact blocks?

There are two types of contact, contacts that are closed in a non-activated state and those that are open. They will be described as N/C (normally closed) and N/O (normally open).NC contacts are used as interlocks. NO contacts are used for switching on other components such as status indication lamps.


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Description Price Number of Contacts Normal State Configuration Range Mounting Style Contact Current Rating Contact Voltage Rating Series Pole and Throw Configuration Terminal Type Minimum Operating Temperature Maximum Operating Temperature Operating Temperature Range
RS庫存編號 394-9936
製造零件編號LADN11
HK$157.19
單位
2 NO/NC TeSys Front Mount 10 A - LADN DP Screw - - -5 → +60 °C
RS庫存編號 394-9908
製造零件編號LADN22
HK$203.46
單位
4 2NO/2NC TeSys Front Mount 10 A 600 V ac LADN 4P Screw -5°C +60°C -
RS庫存編號 791-2824
製造零件編號A9A26924
HK$501.38
單位
1 NO/NC Acti 9 DIN Rail Mount 2 A dc, 6 A ac 24 → 130 V dc, 240 → 415 V ac iOF SPCO Screw -35°C +70°C -35 → +70 °C
RS庫存編號 257-3752
製造零件編號VZ7
HK$329.12
單位
2 NO/NC - - - - VZ7 DP - - - -
RS庫存編號 394-9879
製造零件編號LADN40
HK$193.77
單位
4 4NO TeSys Front Mount 10 A - LADN 4P Screw - - -
RS庫存編號 394-9970
製造零件編號LADN02
HK$85.59
單位
2 2NC - Front Mount - - LADN DP Screw - - -
RS庫存編號 685-1517
製造零件編號BFX1022
BrandLovato
HK$214.20
單位
4 2NO/2NC - Snap-On - - - - Screw - - -
RS庫存編號 314-292
製造零件編號3TX4001-2A
BrandSiemens
HK$69.01
單位
1 NC - Plug In 6 A - 3TX4 SP - - - -
RS庫存編號 818-277
製造零件編號072896 & NHI11-PKZ0
BrandEaton
HK$134.02
單位
2 NO/NC - Side Mount 2 A dc, 3.5 A ac 220 V dc, 500 V ac - DPST Screw - - -
RS庫存編號 395-0144
製造零件編號GVAE11
HK$114.46
單位
2 NO/NC TeSys Front Mount 2.5 A 60 V dc, 240 V ac GVAE DP Screw - - -
RS庫存編號 331-3696
BrandRS PRO
HK$62.77
單位
2 NO/NC - DIN Rail Mount - 240 V ac - DP - - - -
RS庫存編號 392-8973
製造零件編號3RH1921-1CA01
BrandSiemens
HK$57.69
單位
1 NC Sirius Classic Snap-On - - 3RH1 SP Screw - - -
RS庫存編號 394-9920
製造零件編號LADN13
HK$155.26
單位
4 NO/3NC - Front Mount - - LADN 4P Screw - - -
RS庫存編號 521-4579
製造零件編號5ST3010
BrandSiemens
HK$902.87
單位
2 NO/NC Sentron DIN Rail Mount 6 A 230 V ac 5ST3 DP Screw -5°C +40°C -5 → +40 °C
RS庫存編號 279-6337
製造零件編號LA1KN31
HK$138.54
單位
4 3NO/NC - Clip On 10 A 600 V ac LA1K 4P Screw - - -
RS庫存編號 685-1504
製造零件編號BFX1011
BrandLovato
HK$109.31
單位
2 NO/NC - Snap-On - - - - Screw - - -
RS庫存編號 706-0879
製造零件編號3RH2911-1DA11
BrandSiemens
HK$159.58
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 711-6335
製造零件編號1SBN010111R1001 CC4-01
BrandABB
HK$180.83
單位
1 NC - Front Mount 6 A 600 V dc, 690 V ac CC4 SP Screw -40°C +70°C -40 → +70 °C
RS庫存編號 392-8967
製造零件編號3RH1921-1CA10
BrandSiemens
HK$68.23
單位
1 NO Sirius Classic Snap-On - - 3RH1 SP Screw - - -
RS庫存編號 467-5490
製造零件編號1SDA051370R1 AUX-C T1-T2-T3 1Q 1SY
BrandABB
HK$841.03
單位
1 NO/NC - - - - TMAX SPDT - - - -