Contactors (Solid State)
1. What are Solid State Contactors?
A solid-state contactor is a contactless switching device that uses semiconductor devices (such as IGBTs and MOSFETs) to connect and disconnect circuits. Unlike traditional electromagnetic contactors, it utilizes zero-voltage conduction/zero-current shutdown technology to achieve high-precision power control.
2. What are the Structural Advantages of Solid State Contactors?
No mechanical moving parts, lifespan of over 1 million cycles (electromagnetic types only 100,000-200,000 cycles);
Response time <1ms, supports kHz-level high-frequency operation;
Excellent electromagnetic compatibility, no arcing.
3. What are the Performance Parameters of Solid State Contactors?
|
Indicator |
Typical Value |
Test Conditions |
|
On-resistance |
0.5-5mΩ |
at 25°C |
|
Insulation Withstand Voltage |
2500VAC/1min |
compliant with IEC 60947-4-3 |
|
Operating Temperature |
-40℃~85℃ |
industrial-grade standard |
4. What are the Application Scenarios of Solid State Contactors?
New Energy: DC-side protection for photovoltaic inverters, electric vehicle charging stations.
Industrial Automation: Servo drive main circuit switching, inverter output control.
Special Environments: Spacecraft power distribution systems, nuclear power plant auxiliary power supply.
5. Selection Guide for Solid State Contactors
Voltage Matching: A 20% margin is required for continuous operating voltage.
Thermal Management: A heat sink is required (junction temperature ≤ 125°C).
Drive Isolation: Optocoupler isolation is recommended.