Digital AC Overvoltage / Undervoltage Protector Module with Display

The Premium Digital AC Overvoltage and Undervoltage Protector Module is an intelligent, programmable power protection switch designed to safeguard sensitive electronics and electrical equipment from unstable mains fluctuations. This high-precision control board continuously monitors incoming alternating current (AC) lines and provides a real-time readout on its integrated 3-digit LED segment display. When line voltage climbs too high or drops too low past your custom safety boundaries, the onboard micro-controller instantly triggers a heavy-duty 10A isolation relay to cut off power to downstream loads. It acts as an indispensable defense barrier against brownouts, power surges, overvoltage spikes, and grid irregularities.

• Real-Time Digital Monitoring: Features a highly visible 3-digit numeric LED display (Model 3631AS-1) that acts as a standalone voltmeter, showing live voltage values during normal conditions and flashing error codes during faults.
• Fully Customizable Voltage Limits: Equipped with onboard dual tactile programming switches that allow users to easily set precise upper limit (overvoltage) and lower limit (undervoltage) cutoff thresholds tailored to specific appliance needs.
• Heavy-Duty 10A Switching Relay: Features a reliable, high-grade blue power relay capable of handling standard current loads up to 10A 250VAC / 30VDC or 12A 125VAC / 28VDC, providing arc-resistant, clean electrical circuit isolation.
• Dual Isolated Power Configuration: Designed with a clear separation of paths, featuring a robust 4-pin barrier screw terminal strip for heavy AC line routing (Line/Neutral Input and Output) and a separate 2-pin green screw terminal block for the internal control logic circuit (+/- VIN).
• Premium Solid-State Assembly: Engineered on a rigid, high-insulation blue fiberglass PCB board with a molded encapsulation transformer to shield inner circuitry from electromagnetic interference (EMI) and line noise.

This smart voltage protection module serves as an excellent custom solution across many electrical scenarios:

• Household Appliance Protection: Protects high-value household items such as refrigerators, smart TVs, washing machines, and air conditioners from burning out during unexpected voltage drops or post-blackout power spikes.
• DIY Solar & Inverter In-Line Safety: Integrates into custom off-grid solar storage kits and power inverters to ensure the battery output remains safe, clean, and within the rated range before powering connected devices.
• Industrial & Home Automation Panels: Functions as a compact DIN-rail or chassis-mounted monitoring unit inside automation distribution boxes to protect programmable logic controllers (PLCs) and sensitive industrial switches.
• Electronics Engineering & Research Labs: A highly useful testbench monitoring solution for engineering universities, research labs, and hobbyist maker spaces to protect sensitive prototypes from erratic mains power lines.

• Relay Cutoff Capacity: 10A @ 250VAC / 30VDC | 12A @ 125VAC / 28VDC
• Display Layout: 3-Digit Red LED Segment Display
• Input Connections: 4-Pin Main Terminal Barrier (L-IN, N-IN, N-OUT, L-OUT)
• Control Board Power Input: 2-Pin Terminal Block (+ VIN -)