Contactors (Electromechanical)

1. What are Electromechanical Contactors?

An electromagnetic contactor is an automatic switching device driven by an electromagnet. Its core structure consists of a coil, an iron core, and a contact system. When the coil is energized, the electromagnetic force closes the moving and stationary contacts, closing the circuit. Typical operating voltages range from AC 24V-480V/DC 12V-250V, and the contact current ranges from 5A to 3000A.

 

2. What are the Key Features of Electromechanical Contactors?

High Reliability: Mechanical lifespan exceeds 10 million cycles, electrical lifespan approximately 500,000-1 million cycles.

Fast Response: Actuation time is typically less than 20ms.

Overload Protection: Can be combined with thermal relays for circuit protection.

Modular Design: Supports expanded functions such as auxiliary contacts and mechanical interlocks.

 

3. What are the Typical Applications of Electromechanical Contactors?

Motor start/stop control (accounting for 70% of industrial applications);

Power system distribution cabinets;

New energy sectors (photovoltaic inverters, charging stations);

Rail transit traction systems.

 

4. Selection Considerations for Electromechanical Contactors

Rated Voltage: Matches the power system voltage level.

Contact Current: 1.2-1.5 times the load current.

Coil Voltage: Must be consistent with the control circuit.

Ambient Temperature: Industrial-grade, typically -25°C to 55°C.

 

5. Technology Trends of Electromechanical Contactors

Solid-State Contactors (Contactless);

Intelligent Contactors (Integrated Communication Modules);

Wide Bandgap Semiconductor Applications (SiC/GaN Drive Technology).