HG4078-5V-SHG 8-Pin Relay 5VDC Coil 2A
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Prices updated: 14 Oct 2026
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About this product
The HG4078-5V-SHG is an 8-pin electromechanical relay with a 5 VDC coil and a 2 A contact rating. It lets a microcontroller or low-voltage circuit switch separate loads, such as lamps, pumps or small motors. Check the datasheet for the contact arrangement and pinout before wiring.
Specifications
- Number of pins
- 8
- Coil voltage
- 5 VDC
- Contact current rating
- 2 A
- Type
- Electromechanical relay
Frequently asked questions
How do I drive this 5V relay from a microcontroller?
Power the coil at 5 VDC and switch its ground side with a transistor or MOSFET driver, since a microcontroller pin cannot supply the coil current directly. Add a flyback diode across the coil to protect the driver from voltage spikes.
Can it switch mains voltage loads?
The 2 A rating applies to the contacts, so check the datasheet for the maximum AC voltage and load type. Mains connections should only be made by a qualified person with proper insulation and enclosure.
