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 Stock No. 121-6875
BrandRS PRO
MYR23.43
Each
units
- - - DIN Rail Mount - - MSK - Screw -25°C +60°C -25 → +60 °C
RS Stock No. 121-6866
BrandRS PRO
MYR30.54
Each
units
1 1NC - DIN Rail Mount - - HSV - Screw -25°C +60°C -25 → +60 °C
RS Stock No. 121-6869
BrandRS PRO
MYR83.25
Each
units
- - - DIN Rail Mount - - UR - Screw -25°C +60°C -25 → +60 °C
RS Stock No. 331-3696
BrandRS PRO
MYR36.67
Each
units
2 NO/NC - DIN Rail Mount - 240 V ac - DP - - - -
RS Stock No. 121-6867
BrandRS PRO
MYR34.97
Each
units
1 1NO - DIN Rail Mount - - HRS - Screw -25°C +60°C -25 → +60 °C
RS Stock No. 121-6870
BrandRS PRO
MYR92.98
Each
units
- - - DIN Rail Mount - - UR - Screw -25°C +60°C -25 → +60 °C
RS Stock No. 121-6868
BrandRS PRO
MYR34.97
Each
units
1 1NC - DIN Rail Mount - - HRS - Screw -25°C +60°C -25 → +60 °C
RS Stock No. 121-6865
BrandRS PRO
MYR30.29
Each
units
1 1NO - DIN Rail Mount - - HSV - Screw -25°C +60°C -25 → +60 °C
RS Stock No. 121-6871
BrandRS PRO
MYR83.25
Each
units
- - - DIN Rail Mount - - AR - Screw -25°C +60°C -25 → +60 °C
RS Stock No. 121-6872
BrandRS PRO
MYR94.15
Each
units
- - - DIN Rail Mount - - AR - Screw -25°C +60°C -25 → +60 °C
RS Stock No. 121-6874
BrandRS PRO
MYR14.26
Each
units
- - - DIN Rail Mount - - MSK - Screw -25°C +60°C -25 → +60 °C
RS Stock No. 466-295
BrandRS PRO
MYR28.80
Each
units
1 NO/NC - Panel Mount 63 A - - SPDT - - - -
RS Stock No. 394-9908
Mfr. Part No.LADN22
MYR101.29
Each
units
4 2NO/2NC TeSys Front Mount 10 A 600 V ac LADN 4P Screw -5°C +60°C -
RS Stock No. 394-9936
Mfr. Part No.LADN11
MYR64.60
Each
units
2 NO/NC TeSys Front Mount 10 A - LADN DP Screw - - -5 → +60 °C
RS Stock No. 445-0415
Mfr. Part No.1SAM201901R1001 HKF1-11
BrandABB
MYR74.65
Each
units
2 NO/NC - Front Mount 1 A dc, 3 A ac 220 V dc, 230 V ac HK1 DP - - - -
RS Stock No. 818-277
Mfr. Part No.072896 & NHI11-PKZ0
BrandEaton
MYR77.70
Each
units
2 NO/NC - Side Mount 2 A dc, 3.5 A ac 220 V dc, 500 V ac - DPST Screw - - -
RS Stock No. 791-2824
Mfr. Part No.A9A26924
MYR232.32
Each
units
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 Stock No. 314-292
Mfr. Part No.3TX4001-2A
BrandSiemens
MYR40.01
Each
units
1 NC - Plug In 6 A - 3TX4 SP - - - -
RS Stock No. 521-4579
Mfr. Part No.5ST3010
BrandSiemens
MYR468.36
Each
units
2 NO/NC Sentron DIN Rail Mount 6 A 230 V ac 5ST3 DP Screw -5°C +40°C -5 → +40 °C
RS Stock No. 394-9879
Mfr. Part No.LADN40
MYR103.41
Each
units
4 4NO TeSys Front Mount 10 A - LADN 4P Screw - - -