Besides energy meters, we also produce electrical instruments for power monitoring and protection in our own factory in Wenzhou, China. Every unit is strictly tested before shipment. This page shows the instruments currently available — tell us what your project needs and we will confirm the right model.

Product Range

What Is a Voltage & Current Protector?

It is a compact protection device installed on a 35mm DIN rail in front of the circuit it protects. It continuously watches the supply voltage and the load current. When the voltage goes too high, drops too low, or the current exceeds the set limit, it cuts the supply within milliseconds and reconnects automatically when conditions return to normal.

What It Protects Against

• Over-voltage — burns out appliances, motors and power supplies
• Under-voltage — makes motors overheat and compressors stall
• Over-current / overload — overheats wiring and can start fires
• Phase abnormality (three-phase types) — protects three-phase motors and equipment

Typical Applications

• Air conditioners, refrigerators and pumps in homes and shops
• Sub-metering boards in apartments, markets and industrial parks
• Protection for prepaid meter installations
• Distribution boards in areas with unstable grid voltage

Key Specifications

Type: voltage & current protector, DIN-rail mounted
Voltage: 220V / 230V AC, 50Hz or 60Hz
Current: 40A, 63A or as required
Protection: over-voltage, under-voltage, over-current, with adjustable thresholds
Reconnection: automatic, with adjustable delay
Display: digital voltage / current display, LED indicator

Other Instruments

Our main lines are the energy meter categories on this site — see All Products for single-phase and three-phase meters, and Water Meters for our water metering range. If you need a protector rating or an instrument that is not listed here, send us the specification — small and trial orders are welcome.