Industrial Solid State Relay DC-AC 60A–400A High Power SSR
Industrial Solid State Relay DC-AC 60A–400A High Power SSR
Industrial Solid State Relay — DC Control AC, 60A to 400A
Take full command of your high-power AC loads with this heavy-duty Industrial Solid State Relay (SSR). Designed for demanding DC-to-AC switching applications, this relay series covers a wide current range — from 60A all the way up to 400A — making it an ideal choice for industrial automation, heating systems, motor control panels, packaging machinery, and more. With no moving parts, the SSR delivers silent, spark-free, and long-lasting switching performance far superior to traditional mechanical relays.
Made in Mainland China.
Key Features
- Wide Current Range: Available in 60A, 80A, 100A, 120A, 150A, 200A, 250A, 300A, 340A, and 400A ratings to match your exact application needs.
- DC Input / AC Output (DA Type): DC control signal switches high-voltage AC loads — perfect for PLC, microcontroller, and industrial controller integration.
- High-Power Capability: Built to handle heavy industrial loads including resistive, capacitive, and inductive equipment.
- Solid State Technology: No mechanical contacts means zero arcing, zero noise, and dramatically extended service life compared to electromechanical relays.
- Compact, Panel-Mount Design: Easy installation into control enclosures and DIN-rail panels.
- Fast Switching Response: Near-instantaneous switching for precise process control.
Important Selection Guidelines
The rated current printed on the module reflects the average on-state current, not the long-term continuous RMS value. Always select a module with sufficient margin based on your real-world operating conditions:
- Resistive Loads: Apply a 2× to 2.5× safety margin — Actual current (A) × 2–2.5 = Required module rating (A)
- Inductive Loads (motors, transformers, solenoids): Apply a 6× to 7× safety margin — Actual current (A) × 6–7 = Required module rating (A)
Heat Sink Requirement
When the actual operating current exceeds 5A, a compatible heat sink must be installed to ensure safe, reliable long-term operation and to prevent thermal damage. Adequate cooling is critical for maintaining rated performance.
Specifications at a Glance
- Available Ratings: 60A / 80A / 100A / 120A / 150A / 200A / 250A / 300A / 340A / 400A
- Control Type: DC Input → AC Output (DA)
- Application: Industrial automation, heating control, motor switching, process control
- Mount Type: Panel / Enclosure
- Origin: Made in Mainland China
Ordering Information
Standard models are kept in stock and available for immediate dispatch. For bulk or volume orders, please contact customer service with your required quantity to confirm availability and lead times before placing your order.
For additional guidance on selecting solid state relays for industrial applications, visit the OSHA Electrical Safety Resource to ensure your installation meets workplace safety standards.
Frequently Asked Questions
Q: What is the difference between a solid state relay and a mechanical relay?
A: A solid state relay (SSR) uses semiconductor devices (such as thyristors or TRIACs) to switch loads electronically, with no moving parts. This results in silent operation, faster switching speeds, longer service life, no contact arcing, and higher resistance to vibration compared to traditional electromechanical relays.
Q: Do I need a heat sink with this solid state relay?
A: Yes. For any application where the actual operating current exceeds 5A, a properly sized heat sink is required. SSRs generate heat during operation, and without adequate thermal management the module may overheat and fail prematurely. Always match the heat sink to your operating current and ambient temperature.
Q: How do I choose the correct current rating for my application?
A: Always apply a safety margin above your actual load current. For resistive loads, multiply the actual current by 2 to 2.5 to find the minimum module rating. For inductive loads such as motors or transformers, multiply the actual current by 6 to 7. This ensures the relay operates well within its thermal and electrical limits for reliable long-term performance.
Q: What types of loads can this DC-AC solid state relay control?
A: This SSR is designed to switch AC loads using a DC control signal, making it compatible with PLCs, microcontrollers, and industrial automation systems. Typical applications include electric heaters, lighting systems, pumps, motors, conveyor drives, and other industrial equipment.