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Solid state relay
Solid state relays (SSRs) are semiconductor-based switching devices that perform the same function as electromechanical relays but without moving parts. They use optocouplers or transformers for input-output isolation and thyristors, triacs, or MOSFETs for output switching. Key technical parameters include load voltage (from 24 VAC/DC up to 600 ...
Solid state relays (SSRs) are semiconductor-based switching devices that perform the same function as electromechanical relays but without moving parts. They use optocouplers or transformers for input-output isolation and thyristors, triacs, or MOSFETs for output switching. Key technical parameters include load voltage (from 24 VAC/DC up to 600 VAC), load current (from 2 A to 150 A), control voltage (typically 3-32 VDC or 90-280 VAC), and zero-crossing or random-fire switching modes. SSRs are available in panel mount, DIN rail mount, and PCB mount form factors, with IP20 protection for enclosed units. They offer fast switching speeds (microseconds), high shock and vibration resistance, and silent operation, making them ideal for resistive and inductive loads.
SSRs are widely used in industrial automation for temperature control in plastic injection molding machines, packaging equipment, and HVAC systems. They are also deployed in process control for electric furnaces, ovens, and lighting systems. In motor control applications, they handle soft starts for single-phase motors. Other sectors include medical equipment, semiconductor manufacturing, and renewable energy systems like solar inverters. Their ability to switch high currents with low control power makes them essential in PLC-controlled panels and distributed control systems.
Our category includes single-phase and three-phase SSRs, with subcategories like DC output SSRs (for DC loads), AC output SSRs (for AC loads), and universal input SSRs. Key article codes follow patterns such as SSR-1P-25A-240V for a single-phase 25 A 240 V unit, or SSR-3P-50A-480V for a three-phase 50 A 480 V model. We also stock high-current SSRs up to 150 A, low-voltage SSRs for 24 V systems, and specialized models with built-in heat sinks or diagnostic LEDs. Common codes include SSR-1P-10A-24VDC, SSR-1P-40A-480VAC, and SSR-3P-75A-600VAC.
We offer express worldwide shipping with real-time pricing and stock availability on our portal. Our team of specialized electrical engineers provides personalized technical support for selecting the right SSR based on load type, switching frequency, and thermal management requirements. Each product includes detailed datasheets with thermal derating curves, wiring diagrams, and mounting instructions. We also supply compatible heat sinks and snubber circuits to ensure reliable long-term operation.
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