UTKFHT DC 12–36V Low Voltage Protector — Waterproof Battery Disconnect Switch with LED Display

UTKFHT DC 12–36V Low Voltage Protector is a waterproof battery disconnect switch that automatically cuts load power to protect 12–36V battery systems from over-discharge. This compact, ABS-encased module monitors battery voltage and opens the circuit when the preset threshold is reached, preserving battery life and preventing deep discharge. It works across a range of 12–36V DC systems—including lead-acid, lithium-ion, and solar setups—and includes a clear three-digit LED readout plus memory for saved settings.

How will this protector behave in a solar or DC battery system?

The unit constantly measures battery voltage and disconnects the load when voltage falls to the programmed cutoff. When voltage rises back above the restore threshold, the module can reconnect the load automatically according to your configuration.

• Monitors DC 12–36V battery voltage in real time
• Auto-disconnect at your chosen low-voltage threshold
• Automatic reconnect after recharge when set
• LED shows live voltage and status for quick checks

Is installation difficult and what wiring is required?

Installation is straightforward: two wiring terminals accept the supply and the load, so wiring is minimal and quick. The package includes a manual that walks through parameter setup and wiring diagrams for typical setups.

• Two-terminal connection: battery input and load output
• Compact PCB fits into small enclosures or panels
• Clear manual for parameter programming and wiring tips
• Recommended fuse or breaker inline for added protection

What protection limits and real-world performance should I expect?

The module protects batteries by disconnecting before harmful deep discharge, but it uses a miniature relay and thin internal wiring. For reliable long-term use, keep continuous current under 8A and follow recommended quick-disconnect procedures when high currents occur.

• Rated for DC 12–36V battery systems
• Practical current limit: do not exceed 8A continuous
• Relay-based switching—avoid heavy inductive loads without proper precautions
• Waterproof ABS housing designed for outdoor or damp locations

How do settings and memory behave during power loss?

The protector stores your configuration in non-volatile memory so configured voltage thresholds and behavior persist through power interruptions. This removes the need to reprogram after outages and ensures the device resumes protecting the battery with the same parameters.

• Settings retained during power off or discharged battery
• LED display returns to show voltage and status after restart
• Fast recovery to previous settings once power is restored
• Manual included to help recover or adjust thresholds quickly

Who is this for? This UTKFHT low-voltage protector is designed for DIYers, solar hobbyists, RV and marine owners, and small off-grid systems that need a dependable, compact battery disconnect. It’s ideal when you want reliable cutoff control and clear status feedback in damp or exposed environments, provided your continuous draw stays below the recommended 8A limit. If you require higher continuous current switching, pair this module with an appropriately rated contactor or use it as a control trigger for larger protective devices.

FAQ

Q: What voltage range does this protector support?

A: It supports DC systems from 12V up to 36V, suitable for common lead-acid, lithium, and solar batteries.

Q: Can I run more than 8A continuously through this module?

A: No. Continuous current should stay below 8A due to the miniature relay and thin internal wiring.