SLA-05VDC-SL-A 30A

Overview

SLA-05VDC-SL-A 5V DC High Current Relay rated at 30A for heavy-duty switching applications. A robust and reliable relay designed for high-power load control in automotive systems, solar energy, battery management, industrial automation, and high-current embedded systems. Compatible with Arduino, ESP32, and STM32 via transistor driver circuit.

Specifications

Parameter	Value
Model	SLA-05VDC-SL-A
Coil Voltage	5V DC
Contact Configuration	SPDT (NO/NC/COM)
Contact Rating AC	30A / 250VAC
Contact Rating DC	30A / 30VDC
Coil Resistance	~75Ω
Coil Power	~330mW
Insulation Resistance	≥100MΩ
Dielectric Strength	1500VAC
Package	PCB / Panel Mount
Dimensions	29 x 12.7 x 25.4mm
Operating Temperature	-40°C to +85°C
Mechanical Life	≥10,000,000 operations
Electrical Life	≥100,000 operations

Features

• 5V coil — directly compatible with Arduino, ESP32, STM32, Raspberry Pi
• 30A high current rating — handles motors, pumps, heating elements, compressors
• SPDT contacts — Normally Open (NO) and Normally Closed (NC) available
• Heavy-duty construction — suitable for industrial and automotive use
• Low coil power consumption — efficient for embedded systems
• Wide temperature range — reliable in harsh environments
• Compatible with ULN2003, 2N2222, TIP120 driver circuits

Pin Configuration

Pin	Description
Coil+	Connect to 5V via transistor driver
Coil−	Connect to GND
COM	Common terminal
NO	Normally Open — closes when relay energized
NC	Normally Closed — opens when relay energized

Driver Circuit

• Transistor: NPN high current (TIP120, TIP31, 2N2222)
• Base: 1kΩ resistor → GPIO pin (3.3V or 5V)
• Collector: Relay coil positive pin
• Emitter: GND
• Flyback diode: 1N4007 across coil pins (cathode to Coil+)
• Note: For 30A loads use adequate wire gauge (AWG 10 or thicker)

⚠️ Safety Warning

• Do NOT switch loads above rated current (30A)
• Use proper wire gauge for high current connections
• Always add flyback diode to protect microcontroller
• Ensure adequate heat dissipation for continuous high-current operation
• Follow local electrical safety codes for AC mains wiring

Applications

• Solar panel switching and battery management
• Automotive relay replacement
• High-power motor control
• Electric vehicle (EV) systems
• HVAC compressor control
• Industrial machine switching
• High-current LED and lighting systems
• Arduino / ESP32 high-power IoT control