3-Phase Solid State Relay for Reliable Industrial Control [2025 Guide]

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3-Phase Solid State Relay: Three-Phase Circuit Control with Integrated Design

3-Phase Solid State Relay: Three-Phase Circuit Control with Integrated Design

The 3-phase solid state relay is designed for controlling three-phase AC circuits, capable of simultaneously switching three-phase loads. It integrates three single-phase SSR units, providing balanced control for three-phase systems and ensuring synchronous on/off of three-phase power. Widely used in industrial motor control, three-phase power supply systems, and heavy-duty equipment, this relay offers high current capacity, strong anti-interference capability, and reliable three-phase coordination, enhancing the efficiency and safety of three-phase power control.
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Advantages

Three-Phase Synchronous Control

Integrates three single-phase SSRs for simultaneous switching, ensuring balanced three-phase current and preventing motor phase loss.

High Current Capacity (30-200A)

Directly controls 3-phase motors up to 75kW, eliminating the need for contactors and reducing control cabinet size.

Thermal Overload Protection

Built-in temperature sensor triggers shutdown at >105°C, preventing burnout from long-term overload in motor control applications.

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This 30A 3-phase SSR was designed for medium-duty applications, such as industrial lighting systems or small-scale conveyor motors. Because of its 3-32V DC input range, it is compatible with PLCs and microcontrollers. Voltage spikes are minimized due to zero-voltage switching features, extending the lifespan of loaded components. Compact design allows mounting on top of a DIN rail whereby existing control panels can be simplified into those compliant with IEC 60947-4-3.

Frequently Asked Questions

How does a 3-phase solid state relay control three-phase systems?

A 3-phase solid state relay integrates three single-phase SSRs for simultaneous switching, ensuring balanced three-phase current and preventing motor phase loss. This synchronous control is critical for stable operation of three-phase motors in industrial applications.
With high current capacity (30-200A), the 3-phase SSR can directly control three-phase motors up to 75kW, eliminating the need for contactors and reducing control cabinet size. This high-power capability simplifies motor control in heavy-duty applications.
No, the 3-phase SSR is phase sequence-insensitive, operating regardless of input phase sequence. This simplifies field wiring and reduces connection errors, making installation faster and more reliable in three-phase power systems.
The 3-phase SSR includes thermal overload protection with a built-in temperature sensor that triggers shutdown at >105°C. This prevents burnout from long-term overload in motor control applications, ensuring safe and prolonged operation.
Yes, the 3-phase SSR uses soft switching technology to reduce electromagnetic radiation, complying with CE/FCC standards. This makes it suitable for use in sensitive electronic environments or applications requiring low EMI emissions.
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Customer Reviews

Li Dong
High Current Capacity for Heavy Machinery

"In our extrusion line's motor control cabinet, these SSRs handle 150A currents effortlessly. The built-in heat sink and fan keep temperatures in check even during peak loads, and the phase sequence insensitivity made wiring much faster. We've reduced downtime by 30% since switching from contactors—worth the investment."

Grace Liu
Low EMI for Industrial Automation

"Integrated into our PLC-controlled conveyor system, these SSRs emit minimal EMI, allowing our proximity sensors to work without interference. The soft switching feature reduces stress on our motors, extending their lifespan. Easy to configure with our existing control software—highly compatible."

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xckvr54d1h29
heavy duty limit switch
spring limit switch
explosion proof limit switch
24v limit switch
Low EMI Emission

Low EMI Emission

Soft switching technology reduces electromagnetic radiation, complying with CE/FCC standards for use in sensitive electronic environments.
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