SSR-VA Solid State Relay
Variable Resistor Type with AC Input for Industrial Applications
Product Overview
The SSR-VA series is a high-performance variable resistor type solid state relay designed for industrial automation and control systems with AC input requirements. Utilizing advanced semiconductor technology, it provides reliable switching without mechanical contacts, ensuring long service life and silent operation. With input voltage range of 80-250V AC and load voltage capability of 24-380V AC, it offers exceptional compatibility with various control systems and industrial applications. The zero-cross feature minimizes electromagnetic interference and inrush current, making it ideal for 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 control.
AC Input Voltage
Input: 80-250V AC, Load: 24-380V AC for versatile applications.
High Current Capacity
Available in multiple models from 10A to 125A 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 environments.
Current Range Options
Industrial Application Scenarios
The SSR-VA series solid state relays are ideal for a wide range of industrial applications where AC input control and reliable, noiseless switching is required. Their zero-cross operation makes them particularly suitable for controlling resistive and inductive loads with minimal EMI.
Industrial Heating Systems
Precise control of heating elements in industrial ovens, furnaces, and process heating equipment with AC input compatibility.
Key Benefits:
- Direct AC input compatibility eliminates need for DC conversion
- Zero-cross switching prevents current surges
- No acoustic noise during operation
AC Lighting Control
Control of industrial and commercial lighting systems where AC input signals are standard.
Key Benefits:
- Direct compatibility with AC control signals
- Extended lamp life with soft switching
- High reliability for continuous operation
Motor Control
Control of small motors, solenoids, and transformers in automation systems with AC control signals.
Key Benefits:
- Reduced EMI for sensitive control systems
- No contact bounce for precise control
- High resistance to shock and vibration
Power Control Systems
Switching and control of AC power supplies, transformers, and voltage regulation systems.
Key Benefits:
- Low leakage current improves efficiency
- High isolation ensures safety
- Wide operating temperature range
HVAC Systems
Control of fans, blowers, and compressors in heating, ventilation, and air conditioning systems with AC control signals.
Key Benefits:
- Silent operation for noise-sensitive environments
- Long service life reduces maintenance
- Reliable performance in varying temperatures
Industrial Automation
Integration into PLC systems and industrial control panels with AC output signals.
Key Benefits:
- Direct compatibility with AC control systems
- Fast switching for precise control
- Compact size for space-constrained applications
Wiring Diagram
Connection Guide:
Proper wiring for AC input control and AC load connections. Ensure appropriate heatsinking based on load current.
Heatsink Recommendations
Thermal Management:
Proper heatsinking is essential for optimal performance. The required heatsink size depends on load current, ambient temperature, and duty cycle. Consult our technical datasheet for detailed thermal guidelines.
Technical Specifications
| Parameter | Specification |
|---|---|
| Input Voltage Range | 80-250V AC |
| Load Voltage Range | 24-380V AC |
| 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 200g (125A) |
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