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. 257-3730
Mfr. Part No.VZ4
HK$221.25
Each
units
1 - - Side Mount 63 A 690 V ac SP Screw -20°C +50°C -20 → +50 °C VZ4 - -
RS Stock No. 209-5690
Mfr. Part No.M5735107
BrandMETCASE
HK$943.34
Each
units
- - - - - - - - - - - - - -
New
RS Stock No. 195-3933
Mfr. Part No.S9-230VCA
BrandCHINT
HK$536.42
Each
units
- - NB1/NBH8/NB1L/NB3LE/NBH8LE DIN Rail Mount - 48 V dc, 230/400 V ac - Cable -5°C +40°C -5 +40 °C - - -
RS Stock No. 706-0885
Mfr. Part No.3RH2911-1FA40
BrandSiemens
HK$113.14
Each
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4 4NO 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. 257-3768
Mfr. Part No.VZ11
HK$120.31
Each
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- - - Side Mount 32 A - - - - - - VZ11 - -
RS Stock No. 706-0882
Mfr. Part No.3RH2911-1FB22
BrandSiemens
HK$202.37
Each
units
4 2NO/2NC Sirius Innovation Snap-On 6 A ac, 10 A dc 250 V dc, 690 V ac 4PST Screw -25°C +60°C -25 +60 °C 3RH2 - -
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