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.

Phase Sequence Insensitivity

Operates regardless of input phase sequence, simplifying wiring in field installations and reducing connection errors.

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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Without mechanical contacts, a 3-phase SSR (Solid State Relay) is a semiconductor device used for controlling three-phase AC loads. Motors, heaters and pumps can all be controlled by it due to zero-crossing switching which minimizes inrush current and electromagnetic interference. It uses up to 2500V of isolation voltage which guarantees safety, while maintaining swift switching speeds on the order of nanoseconds. To prevent power dissipation, managing thermal levels requires auxiliary cooling devices like heat sinks or fans.

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

Wang Jian
Smooth Control for Three-Phase Motors

"Controlling our 50HP induction motor, this 3-phase SSR provides seamless starting and stopping without the jerks from traditional contactors. The synchronous switching prevents phase loss, and the thermal overload protection saved our motor from a recent voltage dip. Quiet operation compared to mechanical relays—great for workshop environments."

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."

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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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