3 PHASE (DC-AC) SSR
DENKI SEIGYO – DSR-3DA-_A Three Phase (DC-AC) Solid State Relay
Category: Solid State Relay / Three-Phase SSR
Manufacturer: Denki Seigyo
Product Overview
The Denki Seigyo DSR-3DA-_A is a three-phase DC-controlled AC-output Solid State Relay (SSR) designed for high-efficiency and long-life industrial switching applications.
Built with advanced semiconductor technology, this SSR provides silent, contactless switching with fast response times, ensuring reliable operation in automation, heating, motor control, and industrial power systems.
Engineered with zero-cross or random-turn-on control options, the DSR-3DA-_A delivers smooth switching performance, extended electrical lifespan, and superior resistance to shock, vibration, and electrical interference.
Key Characteristics
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DC control input with AC output for precise switching of three-phase loads
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Zero-cross and random turn-on options for optimized performance
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Silent and arc-free switching – eliminates mechanical wear and noise
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Built-in LED indicator for easy operation monitoring
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Wide control voltage range and high dielectric strength
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Compact, panel-mount design with screw terminals for secure wiring
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Suitable for resistive, inductive, and motor loads
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Maintenance-free operation and long service life
Versatile and Reliable Industrial SSR
The Denki Seigyo DSR-3DA-_A series provides stable, high-speed, and contactless switching for three-phase AC loads using DC control signals.
Its robust construction and high surge capability make it an excellent choice for industrial automation systems, temperature control, and motor drives.
Designed for continuous operation, it ensures high reliability and safe performance even under demanding load conditions.
3 PHASE (DC-AC) SSR
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | DSR-3DA-_A |
| Type | Three Phase Solid State Relay (DC-AC) |
| Manufacturer | Denki Seigyo |
| Control Type | DC Control Input → AC Output |
| Input Control Voltage | 3–32VDC (standard) |
| Input Current | ≤ 15 mA (typical) |
| Output Load Voltage | 24–480VAC (three-phase) |
| Rated Load Current | 10A / 25A / 40A / 60A / 80A / 100A |
| Frequency Range | 47–63Hz |
| Turn-on Type | Zero-cross or Random-on (optional) |
| Turn-on Time | ≤ 10 ms (Zero-cross) |
| Turn-off Time | ≤ 10 ms |
| ON-State Voltage Drop | ≤ 1.6V (at rated load) |
| OFF-State Leakage | ≤ 10 mA |
| Dielectric Strength | 2500VAC (Input–Output) |
| Insulation Resistance | ≥ 100 MΩ at 500VDC |
| Surge Current | 10× rated current (10 ms) |
| Cooling Method | Natural / Forced air cooling |
| LED Indicator | Built-in (Input ON indication) |
| Mounting Method | Panel / Heat sink mounting |
| Ambient Temperature | -25°C to +80°C |
| Storage Temperature | -30°C to +100°C |
| Humidity Range | 45–85% RH (non-condensing) |
| Housing Material | Flame-retardant thermoplastic |
| Dimensions (L × W × H) | Approx. 105 × 75 × 38 mm |
| Weight | Approx. 280 g |
| Compliance | CE, RoHS |
Key Features
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Three-phase AC load switching with DC control input
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Zero-cross or random-on switching types
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Integrated LED for input indication
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Low leakage current and fast switching speed
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High dielectric strength for industrial safety
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Panel or heat-sink mountable compact design
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No mechanical wear – silent and long-lasting operation
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Reliable performance for resistive, inductive, or motor loads
Applications
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Industrial automation systems
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Heater and furnace control
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Motor and pump control (three-phase)
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Process control systems
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Power distribution panels
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HVAC and temperature control systems
Ordering Information
| Model | Control Voltage (DC) | Output Voltage (AC) | Rated Load Current | Control Type | Indicator |
|---|---|---|---|---|---|
| DSR-3DA-25A | 3–32VDC | 24–480VAC | 25A | Zero-cross | LED |
| DSR-3DA-40A | 3–32VDC | 24–480VAC | 40A | Zero-cross | LED |
| DSR-3DA-60A | 3–32VDC | 24–480VAC | 60A | Random-on | LED |
| DSR-3DA-80A | 3–32VDC | 24–480VAC | 80A | Random-on | LED |
| DSR-3DA-100A | 3–32VDC | 24–480VAC | 100A | Zero-cross | LED |
Product Summary
The Denki Seigyo DSR-3DA-_A Three Phase Solid State Relay (DC-AC) delivers fast, reliable, and maintenance-free switching for industrial AC loads controlled by DC signals.
With high load current capacity, excellent thermal stability, and silent operation, it is ideal for heaters, motors, and process automation equipment.
Engineered to meet CE and RoHS standards, the DSR-3DA-_A ensures long-term performance, superior reliability, and industrial-grade safety in every application.
Wiring Diagram
