What Is a Voltage Current Protector?

A voltage current protector (also known as an adjustable digital over/under voltage and overcurrent protector, or a self-recovering voltage-current combination protector) is a DIN-rail mounted device installed in distribution boxes for integrated circuit protection.

What does it do?

It monitors voltage and current 24/7. When levels exceed safe limits, it cuts power instantly. Once the grid or load returns to normal, it automatically reconnects power after a preset delay. It tackles two major electrical risks: voltage instability and overload.

OBCH offers both single-phase and three-phase models in various current ratings. What are the differences?

• 1P+N Single-Phase (220V – Residential)
Ideal for home main supplies, EV chargers, and retail shops. Monitors single-phase voltage and current. Available ratings: 40A / 63A / 80A / 100A.
• 3P+N Three-Phase (380V – Industrial)
Ideal for factory motors, central air conditioning, and commercial solar systems. Monitors voltage across three phases and current on each phase. Also protects against phase loss and phase imbalance. Available ratings: 63A / 80A / 100A.

Looking for a professional manufacturer? Choose OBCH to make your business easier.Why OBCH?

16 years of manufacturing and sales experience

In-house R&D team – always innovating

Semi-automated production in the heart of China's low-voltage electrical industry zone

Fast delivery, reliable quality, 24/7 technical support

OEM/ODM services available

2-year warranty

We sell more than just a protector — we stand behind you as the expert that solves all your electrical safety concerns. Whether it's unstable home voltage, shop overload trips, overseas wide-voltage distribution, or three-phase equipment burnouts due to phase loss, we provide tailored solutions for every power challenge. Your electrical safety is our priority.