Auxiliary Contactor

The Part of Auxiliary Contactors in Electrical Systems

 

Auxiliary Contactor- One switch can control another switch (often a larger switch) thanks to an auxiliary contactor. A standard (low-power) relay that is built like a "power" contactor and used in combination with another contactor is known as an auxiliary contactor. The set of contacts designated as "low voltage" is typically marked as such.

Auxiliary contacts are included in the control circuit and provide for a variety of functions. The auxiliary contacts can be either open or closed. When the contractor is de-energized, normally open are open. Normally, closed and open are diametrically opposed.

Some are employed in the controls to seal in or keep the main contactor closed after your finger is removed from the start button. Some allow start coils to remain in the circuit until a particular period or current is attained after beginning. Some contacts feature indicator lamps and remote motor status indications.

As a result, the primary connections supply electricity to the motor. Auxiliary contacts are utilized in motor controllers.

 

Distinction between an auxiliary and a power contactor

The main contactor is commonly a power contactor. It can withstand loads of up to 600 Amp. Auxiliary contactors, on the other hand, are only meant to switch currents of up to 10 Amp. A standard (low-power) relay that is built like a "power" contactor and used in combination with another contactor is known as an auxiliary contactor.

This is to emphasize that it is not used to switch loads, but rather has an activation/deactivation or control function.

Auxiliary contactors are used to connect and disconnect circuits (for example, to regulate power contactors).

Typically, auxiliary contactors have no primary connections and only auxiliary contacts.

Types of Auxiliary contactors

1.     Normally open

2.     Normally closed

Function of auxiliary contact block

The control and auxiliary circuits are operated via the auxiliary contact blocks. Auxiliary contact block types for common industrial settings: - Front-mounted, immediate CA4 1 or 4-pole blocks with NO and NC connections - Front-mounted, 1-pole CC4 block with N.O.

Auxiliary Contactor Applications

1) Circuits for motor control and starters

2) Building Automation and Lighting Control

3) Automation of Industrial Processes

 

Final Outcome - Auxiliary contacts serve a broad range of functions for motor-driven equipment and electrical professionals in the area of safety and protection against electrical problems