SSR Solid State Relay 10A 25A 40A DC-AC with Heat Sink & Cover

SSR Single Phase Solid State Relay – 10A / 25A / 40A DC Controlled AC with Dust Cover & Heat Sink

Upgrade your electrical control systems with this CE-certified single-phase solid state relay (SSR). Available in 10A, 25A, and 40A load ratings, this DC-controlled AC relay is engineered for general-purpose industrial and DIY automation applications. It replaces traditional electromechanical relays with a silent, spark-free, and long-lasting switching solution.

Designed to handle demanding environments including high-humidity, corrosive, and high-cycle-frequency conditions, this SSR is widely used in temperature control devices, digital program-controlled equipment, data processing systems, and computer terminal interface circuits.

The included plastic dust cover protects internal components from debris and moisture, while the aluminum heat sink ensures efficient thermal management during continuous operation. Made in Mainland China.

Key Features

• Three Load Options: Choose from 10A, 25A, or 40A to match your application's current requirements
• Wide Load Voltage Range: 24–480V AC — compatible with a broad range of AC-powered equipment
• Low DC Control Voltage: 3–32V DC input makes it easy to interface with microcontrollers, PLCs, and logic circuits
• Minimal Control Current: DC 3–25mA / AC 12mA for efficient signal-level switching
• CE Certified: Meets European safety and performance standards
• Included Dust Cover: Plastic protective cover shields the relay from dust, debris, and moisture
• Included Heat Sink: Aluminum heat sink dissipates heat for reliable, continuous-duty operation
• Solid State Design: No mechanical contacts — silent operation, fast switching, extended service life
• Harsh Environment Ready: Suitable for wet, high-corrosion, and high-frequency switching conditions

Specifications

Common Applications

• Temperature controllers and PID systems
• Digital program-controlled devices
• PLC and microcontroller output stages
• Data processing and computer terminal interface circuits
• Industrial automation and HVAC control
• High-frequency switching systems

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Frequently Asked Questions

Q: What is the difference between the SSR-10DA, SSR-25DA, and SSR-40DA solid state relays?

A: The three models differ only in their maximum load current rating — 10A, 25A, and 40A respectively. All three share the same control voltage range (3–32V DC), load voltage range (24–480V AC), and include the dust cover and heat sink. Choose the rating that best matches or exceeds the current draw of the AC load you intend to control.

Q: Can I use this solid state relay with an Arduino or Raspberry Pi?

A: Yes. The SSR requires only 3–32V DC at 3–25mA to switch on, which is fully compatible with 3.3V and 5V microcontroller output pins such as those on Arduino and Raspberry Pi boards. No additional driver circuit is needed in most cases.

Q: Why does the SSR need a heat sink, and is one included?

A: Solid state relays generate heat during operation, especially at higher load currents. The included aluminum heat sink dissipates this thermal energy to keep the relay within its safe operating temperature range. For high-current or continuous-duty applications (particularly the 40A model), mounting the heat sink properly and ensuring adequate airflow around it is strongly recommended.

Q: Is this relay suitable for outdoor or wet environments?

A: The SSR-DA series is designed to handle high-humidity and corrosive environments, making it suitable for demanding industrial settings. The included plastic dust cover provides additional protection. For fully outdoor or submersion-level exposure, additional enclosure protection is advised.