A30-U1 DC 0 To 99.9V Voltage Guard Controller Board With Delay Relay For Overvoltage Undervoltage Protection, Voltage Detection, Real-Time Screen Readout, And Easy Set Mode For Hassle-Free Power Monitoring

A30-U1 DC Voltage Guard Controller with Delay Relay Module
✔️ Monitors 0-99.9V with upper/lower limits and auto-off timer, single unit

The A30-U1 DC Voltage Guard Controller is a compact protection board designed for power supplies, battery chargers, and motor controllers. It guards against voltage spikes and dips using a delay relay and a simple SET/ENTER mode for quick setup.

✅ 0-99.9V DC input range
✅ Upper and lower voltage limits adjustable via SET/ENTER
✅ Voltage verification offset range -0.5V to 0.5V
✅ Display auto-off timer D-0 to D-9 minutes (D-0 = always on)
✅ Relay output can be set to ON H or ON L for charging/discharging
✅ Real-time voltage readout and easy power-on status

💡 What is a voltage guard controller used for in DC power systems? A handy device to protect DC circuits by keeping voltage within set limits and triggering a relay as needed. - voltage guard controller provides overvoltage and undervoltage protection for DC systems - handy relay-based protection with adjustable upper/lower limits and delay timer - real-time voltage readout and simple SET/ENTER configuration improves setup speed - ideal for power supplies, battery chargers, and motor controllers