SSR 40A Solid State Relay (SSR-40DA)
The SSR 40A Solid State Relay (SSR-40DA) is a high-performance electronic switching device designed to control AC loads without the mechanical wear and arcing of traditional relays. Built using semiconductor switching elements, it provides reliable, silent, and fast switching between states — making it perfect for automated control systems, industrial machinery, and home automation setups.
This relay can handle up to 40A at 24–380V AC output, while being controlled by a DC input range of 3–32V. It uses optical isolation to separate the control side from the load, ensuring safety for users and connected systems. Whether you’re working on a PID temperature controller, a 3D printer, or a smart IoT solution, this module integrates seamlessly with Arduino, 🔗 Raspberry Pi, and 🔗 other microcontrollers.
🔧 Key Technical Specifications:
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Input Control Voltage: 3–32V DC
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Output Load Voltage: 24–380V AC
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Max Load Current: 40A
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Trigger Current: ≥ 7.5mA
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Control Type: DC to AC
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Isolation Method: Opto-isolated (Photovoltaic Coupler)
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Switching Type: Zero-crossing detection
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Response Time: ≤ 10ms
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Mounting Type: Panel Mount (4 screw holes)
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Dimensions: 57mm x 45mm x 23mm (approx.)
💡 Features & Benefits:
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No Moving Parts: Offers long operational life due to solid-state switching
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Noise-Free Operation: Ideal for noise-sensitive environments
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Zero-Cross Technology: Reduces inrush current and prolongs life of connected devices
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Vibration & Shock Resistant: Great for harsh industrial conditions
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Fast Switching: Enables rapid response in high-frequency applications
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Compact & Durable: Easily integrates into compact control panels and enclosures
⚠️ Precautions for Use:
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Always use a heat sink when operating near full load capacity to prevent overheating.
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Ensure the load current does not exceed 40A to avoid damage.
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Verify proper wiring of input and output terminals to prevent short circuits.
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Use adequate fuse protection and circuit breakers for AC loads.
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Mount in well-ventilated environments to avoid thermal buildup.
🔗 Helpful Links & Related Products:
📦 Applications:
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CNC & Industrial Control Panels
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HVAC Systems
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Smart Energy Systems & Home Automation
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Heating and Cooling Systems
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Temperature & Humidity Regulation
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Arduino & IoT Prototyping Projects
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Power Distribution in Robotics and Automation
🔌 Microcontroller Integration:
Easily connect this relay to 🔗 Arduino, 🔗 ESP32, STM32, or Raspberry Pi boards. Its opto-isolated interface ensures compatibility with 3.3V and 5V logic systems, making it a flexible choice for both educational and professional projects.
📍 You can purchase this premium-quality relay at ElectroWay, located in Johar Town, Lahore, or order online for fast delivery across Pakistan. Trusted by educators, developers, and engineers for STEM and IoT electronics.
🎥 Learn How It Works on YouTube:
Watch SSR-40DA Relay Demonstration
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