SSR-3-DA Three-Phase Solid State Relay
Three-Phase DC to AC Zero-Cross Type with High Performance and Reliability for Industrial Applications
Product Overview
The SSR-3-DA series is a high-performance three-phase DC to AC zero-cross solid state relay designed for industrial automation and control systems. Utilizing advanced semiconductor technology, it provides reliable three-phase AC switching with DC control input, ensuring long service life and silent operation. With input voltage range of 3-32V DC and load voltage capability of 24-480V AC, it offers exceptional compatibility with various PLCs, microcontrollers, and industrial control systems. The zero-cross feature minimizes electromagnetic interference and inrush current, making it ideal for three-phase resistive and inductive loads in AC circuits.
Key Advantages
Zero-Cross Triggering
Minimizes EMI and inrush current with precise zero-cross detection technology for all three phases.:cite[3]
DC Control Input
Low voltage DC control (3-32V) compatible with PLCs, microcontrollers and digital logic circuits.:cite[1]:cite[3]
Wide Voltage Range
Input: 3-32V DC, Load: 24-480V AC for versatile three-phase applications.:cite[1]:cite[2]
High Current Capacity
Available in multiple models from 10A to 200A per phase load current ratings.:cite[1]:cite[5]:cite[10]
High Isolation
Excellent dielectric strength of 2500VAC and insulation resistance ≥100MΩ.:cite[4]:cite[8]
Wide Temperature Range
Operates reliably in ambient temperatures from -30°C to 80°C.:cite[5]:cite[6]
Low Control Current
Control current requirement of ＜25mA enables energy-efficient operation.:cite[1]:cite[2]
LED Status Indicator
Built-in red LED provides visual operation status feedback.:cite[1]:cite[2]
Current Range Options
Industrial Application Scenarios
The SSR-3-DA series three-phase DC to AC solid state relays are ideal for a wide range of industrial applications where reliable, noiseless three-phase AC switching with DC control is required. Their zero-cross operation makes them particularly suitable for controlling three-phase resistive and inductive loads with minimal EMI in AC systems.
Three-Phase Heating Control
Precise control of three-phase heating elements in industrial ovens, furnaces, and temperature regulation systems with DC control signals.:cite[1]:cite[2]
Key Benefits:
- Balanced three-phase power distribution
- Zero-cross switching prevents current surges
- Compatible with PLC and microcontroller DC outputs
Three-Phase Motor Control
Control of three-phase AC motors, pumps, and compressors in industrial automation systems with low-voltage DC control circuits.:cite[1]:cite[2]
Key Benefits:
- Reduced EMI for sensitive control systems
- Synchronized phase control
- High resistance to shock and vibration
Industrial Automation
Power control for three-phase industrial equipment including CNC machines, conveyors, and production lines with DC control interfaces.:cite[3]:cite[10]
Key Benefits:
- Long lifespan with no contact wear
- High reliability for continuous operation
- Compact design saves space
Power Distribution Systems
Switching and control of three-phase power supplies, transformers, and voltage regulation systems with DC control signals.
Key Benefits:
- Low leakage current improves efficiency
- High isolation ensures safety
- Wide operating temperature range
HVAC Systems
Control of three-phase AC fans, blowers, and compressors in industrial HVAC systems with DC control capability.:cite[4]
Key Benefits:
- Silent operation for noise-sensitive environments
- Long service life reduces maintenance
- Reliable performance in varying temperatures
Lighting Control
Control of three-phase lighting systems in industrial facilities, stadiums, and large venues with DC control inputs.:cite[4]
Key Benefits:
- Flicker-free operation with zero-cross switching
- Compatible with low-voltage control systems
- No acoustic noise during operation
Three-Phase Wiring Diagram
Connection Guide:
Proper wiring for three-phase DC control input and AC load connections. Ensure appropriate heatsinking based on load current. For currents above 10A, heatsink is required; for 60A and above, add fan cooling.:cite[1]:cite[3]
Heatsink Recommendations
Thermal Management:
Proper heatsinking is essential for optimal performance of three-phase SSRs. The required heatsink size depends on load current, ambient temperature, and duty cycle.:cite[1]:cite[3]
Cooling Requirements: 10-40A: heatsink required; 60A and above: heatsink with fan cooling or water cooling recommended.:cite[1]:cite[2]
Technical Specifications
| Parameter | Specification |
|---|---|
| Input Voltage Range | 3-32V DC |
| Load Voltage Range | 24-480V AC |
| Load Current Range | 10A, 25A, 40A, 60A, 80A, 100A, 120A, 150A, 200A |
| Control Method | Zero Cross |
| Phase Configuration | Three-Phase |
| Operate Time | ≤0.5 cycles of load power +1ms |
| Release Time | ≤0.5 cycles of load power +1ms |
| Leakage Current | 10 mA max |
| Dielectric Strength | 2500 VAC 50/60Hz for 1min |
| Insulation Resistance | ≥100MΩ |
| Ambient Temperature | -30~80℃ |
| Ambient Humidity | 45-85%RH |
| Terminal Fixed Torque | 1.6-2.2N.m |
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