FENGWANGLI 12V Remote Battery Disconnect Switch 200A — Keyfob Remote & Auto Low-Voltage Shutoff

FENGWANGLI's 12V Remote Battery Disconnect Switch is a wireless kill switch that cuts battery power remotely or automatically to prevent theft and stop parasitic drain.

Leave your vehicle parked with confidence: this compact battery disconnect installs at the battery terminals and gives you both manual remote control and automatic protection based on voltage thresholds. Built for 12V systems, the unit combines a mechanical magnetic contactor with smart voltage logic so it reliably disconnects power without drawing significant standby current. It’s rated for a 200A continuous load and supports high starting currents, making it suitable for cars, trucks, ATVs, RVs and many marine applications.

How does the remote disconnect prevent battery drain and theft?

The switch severs the battery negative connection using a magnetic mechanical contactor, stopping parasitic current flow when the vehicle is parked. A keyfob remote lets you cut or restore power instantly, while automatic voltage thresholds trigger shutoff to protect the battery.

• Wireless keyfob control for on-demand disconnect and reconnect
• Automatic shutoff at low voltage (below 11.8V) after a delay to save charge
• Mechanical contactor with near-zero standby current (0.003A)
• Manual power restoration through the remote or by reconnecting wiring

Will this switch handle my vehicle’s starting current and accessories?

Yes — the FENGWANGLI unit is engineered for heavy-duty use: it is rated 200A continuous with the ability to handle high inrush currents typically required at engine start. The robust contactor avoids overheating and supports common accessory loads found in trucks, RVs and boats.

• 200A rated continuous current with 360A robust starting capability
• Suitable for 12V automotive, marine and off-road electrical systems
• Durable contacts designed for frequent switching and high loads

How simple is installation and what wiring changes are needed?

Installation is straightforward: the kit disconnects the negative terminal while a single red lead connects to the positive pole for control power. The upgraded layout removes an extra black power cord so you only secure the battery clip and route the control wires, reducing complexity compared with older designs.

• Connect battery clip to negative terminal; secure red lead to positive pole
• Mount the contactor in a protected, ventilated location near the battery
• Follow included wiring diagram and tighten terminals to manufacturer torque

When does the automatic mode engage and how does it avoid disrupting driving?

The controller monitors battery voltage and acts only when appropriate: if voltage drops below 11.8V the switch will cut power after a 120-second delay to preserve battery life. Conversely, the remote disable feature prevents the keyfob from cutting power while the alternator is actively charging above 13.2V, avoiding accidental shutdown while driving.

• Automatic cutoff after 120s when voltage falls under 11.8V
• Remote control disabled while voltage exceeds 13.2V to prevent in-motion shutdown
• Clear thresholds reduce false triggers from temporary voltage changes

Who is this for: Drivers, fleet operators and recreational vehicle owners who want an easy-to-install, low-standby-current solution to prevent battery drain, unauthorized use and unexpected dead batteries. It’s designed for anyone with a 12V electrical system seeking a reliable, mechanical-contact disconnect that works across cars, trucks, ATVs, RVs, boats and campers without complex electronics or heavy parasitic draw.