SSR-DD Solid State Relay
DC-to-DC Zero-Cross Type with High Performance and Reliability for Industrial Applications
Product Overview
The SSR-DD series is a high-performance DC-to-DC zero-cross solid state relay designed for industrial automation and control systems. Utilizing advanced semiconductor technology, it provides reliable DC switching without mechanical contacts, ensuring long service life and silent operation. With input voltage range of 3-32V DC and load voltage capability of 24-220V DC, it offers exceptional compatibility with various DC control systems and industrial applications. The zero-cross feature minimizes electromagnetic interference and inrush current, making it ideal for DC resistive and inductive loads.
Key Advantages
Zero-Cross Triggering
Minimizes EMI and inrush current with precise zero-cross detection technology.
Fast Switching
Operate and release time of ≤0.5 cycles +1ms for responsive DC control.
Wide DC Voltage Range
Input: 3-32V DC, Load: 24-220V DC for versatile DC applications.
High Current Capacity
Available in multiple models from 10A to 125A DC load current ratings.
High Isolation
Excellent dielectric strength of 2500VAC and insulation resistance ≥100MΩ.
Wide Temperature Range
Operates reliably in ambient temperatures from -30°C to 80°C.
Low Leakage Current
Maximum leakage current of 10mA ensures energy efficiency and safety.
Compact & Robust
Durable construction with optimized heat dissipation for industrial DC environments.
Current Range Options
Industrial Application Scenarios
The SSR-DD series DC-to-DC solid state relays are ideal for a wide range of industrial applications where reliable, noiseless DC switching is required. Their zero-cross operation makes them particularly suitable for controlling DC resistive and inductive loads with minimal EMI.
DC Heating Systems
Precise control of DC heating elements in industrial ovens, battery thermal management, and specialized DC heating applications.
Key Benefits:
- Long lifespan with no contact wear
- Zero-cross switching prevents current surges
- No acoustic noise during operation
Solar Power Systems
Control and switching in solar power installations, charge controllers, and DC power distribution systems.
Key Benefits:
- High reliability for continuous operation
- Efficient DC power switching
- Wide operating temperature range
DC Motor Control
Control of DC motors, actuators, and solenoids in automation systems, robotics, and industrial machinery.
Key Benefits:
- Reduced EMI for sensitive control systems
- No contact bounce for precise control
- High resistance to shock and vibration
Battery Systems
Switching and control in battery charging systems, UPS, and DC backup power applications.
Key Benefits:
- Low leakage current improves efficiency
- High isolation ensures safety
- Wide operating voltage range
Transportation Systems
Control of DC lighting, signals, and accessories in automotive, marine, and railway applications.
Key Benefits:
- Silent operation for noise-sensitive environments
- Long service life reduces maintenance
- Reliable performance in varying temperatures
Test & Measurement Equipment
Precise DC control in laboratory equipment, test benches, and measurement devices.
Key Benefits:
- Minimal EMI prevents interference with sensitive measurements
- Fast switching for precise control
- Compact size for space-constrained applications
Wiring Diagram
Connection Guide:
Proper wiring for DC input control and DC load connections. Ensure correct polarity for both input and load connections and appropriate heatsinking based on load current.
Heatsink Recommendations
Thermal Management:
Proper heatsinking is essential for optimal performance. The required heatsink size depends on DC load current, ambient temperature, and duty cycle. Consult our technical datasheet for detailed thermal guidelines.
Technical Specifications
| Parameter | Specification |
|---|---|
| Input Voltage Range | 3-32V DC |
| Load Voltage Range | 24-220V DC |
| Load Current Range | 10A, 25A, 40A, 60A, 80A, 100A, 125A |
| Control Method | Zero Cross |
| 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 |
| Mounting Method | DIN rail or screw mounting |
| Housing Material | Flame-retardant PBT |
| Weight (approx.) | 45g (10A) to 185g (125A) |
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