Applications

High-Voltage Solid-State Relays (HV-SSRs) are semiconductor-based contactless switching devices designed for circuit connection/disconnection. Their core advantages include high-voltage tolerance (typically 1Kv ), rapid response (microsecond-level), and extended lifespan (far exceeding mechanical relays).

Receives low-voltage control signals (e.g., 5V/12V) via optocouplers or transformers, ensuring electrical isolation between high/low-voltage circuits.

Utilizes series-connected power MOSFETs, IGBTs, or SiC devices to control high-voltage circuits through carrier conduction/interruption. For example, a 10kV-class SSR may employ multi-stage series-connected SiC MOSFETs for voltage balancing.

Control signals are amplified by driver circuits to trigger the gate of power devices, forming a low-impedance pathway. Shutdown relies on reverse bias voltage for rapid arc suppression, eliminating contact arcing issues in mechanical relays.

Optocouplers or magnetic isolators ensure signal transmission safety, with isolation voltages exceeding 5kV between input/output.

Integrated TVS diodes and RC snubber circuits mitigate voltage surges (e.g., per IEC 61000-4-5 standards).

High-thermal-conductivity ceramic substrates (e.g., AlN) paired with air/liquid cooling dissipate heat losses under high-current (e.g., 100A) operation.

Rising adoption of third-generation semiconductors (SiC/GaN) enables HV-SSRs toward higher frequencies (MHz-level) and miniaturization.

Surging demand in renewable energy (PV inverters, EV charging stations) will propel the global market beyond $5 billion by 2025 (CAGR 8.3%).

Smart SSRs with embedded current/temperature sensors dominate the market, supporting IoT remote monitoring for Industry 4.0 compliance.

SMC, as a globally leading power semiconductor device manufacturer with nearly 30 years of history, can provide customers with the most advanced, efficient, and cost-effective third-generation silicon carbide MOSFETs and silicon carbide JBS diodes. In addition, SMC has unique experience in silicon-based power diode devices, and its best-selling high-power ultra-fast recovery diodes, high current Schottky diodes, and other products are highly praised by customers worldwide. SMC's power semiconductor devices can provide higher efficiency, better reliability, good delivery time, and competitive prices for your products. SMC's professional service team around the world allows you to experience the ultimate customer service experience and safeguard your product design.