Songle SLA Series 05V DC Relay—30A 250V

The Songle SLA-05DC-SL-A is a robust, industrial-grade power relay engineered for reliable high-current and high-voltage switching. Its fully sealed construction and strong contact capacity make it ideal for automation, power control, and demanding industrial applications. Suitable for integration with Arduino, Raspberry Pi, and other microcontroller-based systems via an appropriate driver circuit, this relay is a dependable choice for engineers and hobbyists working with electronics components and modules.

⚙️ Key Features

• 🔁 Contact Type: SPST (Switching)
• ⚡ Max Switching Current: 30A
• 🔌 Max Switching Voltage: 250V AC
• 🔋 Coil Voltage: 05V DC
• 🌀 Coil Resistance: 70Ω
• 💡 Coil Power Consumption: 0.36W
• 🛡️ Fully Encapsulated: Sealed construction for enhanced durability and safety

🧩 Typical Applications

• HVAC systems, compressors, and fans
• Industrial machinery and motor control
• Power distribution, heaters, and lighting control
• Home automation and building management
• General-purpose switching of high-power AC loads

🤖 Integration with Arduino, Raspberry Pi, and Microcontrollers

To interface this relay with Arduino, Raspberry Pi, or similar microcontroller platforms, use a proper relay driver (transistor or MOSFET) and a flyback diode across the coil. The 05V coil requires an external 05V supply; do not drive it directly from 3.3V/5V GPIO pins. For simplicity and safety, consider a relay module with an optocoupler and transistor stage when controlling mains-level voltage.

• ✅ Logic-level control via transistor/MOSFET gate
• ✅ Flyback diode for coil transient suppression
• ✅ Optional optocoupler for improved isolation

📐 Electrical Notes & Safety

• Observe load type (resistive vs. inductive) and apply appropriate derating for inductive loads.
• Use snubber networks (RC or MOV) on AC loads to reduce arcing and extend contact life.
• Maintain proper creepage/clearance distances on the PCB when switching mains.
• AC mains wiring should be installed by qualified personnel and comply with local regulations.

📦 What’s Included

• 1 × Songle SLA-05DC-SL-A Relay (05V DC coil, 30A)

✅ A reliable solution for heavy-load switching in HVAC, industrial machines, power control, and home automation systems. Ideal for projects using Arduino, Raspberry Pi, and other microcontroller platforms working with high-power electronics components and modules.