A 12V Four-Channel Relay Module packs four independently controlled electromagnetic relays onto a single printed circuit board (PCB) designed to operate natively on a 12V DC power rail. It allows low-power microcontrollers (like Arduino or ESP32) or 12V sensors to switch up to four separate high-voltage AC or DC appliances simultaneously. It is highly popular across India for multi-circuit automotive upgrades (such as fog lights, horns, and accessories), off-grid solar power distribution benches, and multi-pump industrial automation setups.
✨ Key Features
- Quad Optocoupler Galvanic Isolation: Features four onboard PC817 optocoupler chips that physically separate the digital control signals from the heavy load lines using light vectors, completely protecting your controller from back-EMF spikes.
- 12V Native Rail Efficiency: Engineered to operate directly off standard 12V car batteries, lead-acid cells, or 12V SMPS units without needing any buck converters to power the internal copper coils.
- Flexible Trigger Logic Jumpers: Most variants feature independent onboard plastic jumpers for each channel, allowing you to choose whether a channel is tripped by a High Logic Signal (3.3V to 12V) or a Low Logic Signal (0V).
- Visual Status Layout: Equipped with five surface-mount LEDs; one to confirm steady Board Power (Red) and four independent channel tracking LEDs (IN1 to IN4) to visually show exactly which relay is actively engaged.
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