ABB REX010 Earth Fault Protection Unit

ABB REX010 Earth Fault Protection Unit – Technical Overview

The ABB REX010 is a dedicated earth fault protection unit designed to detect and isolate ground faults in power distribution systems. It monitors residual current through a neutral or ground CT and trips breakers when leakage exceeds set thresholds. The unit uses a 3‑phase voltage sensing input and a built‑in current transformer interface. It offers adjustable pickup levels from 10 mA to 10 A and trip delays from 0.1 s to 5 s. The REX010 runs on a 24 V DC supply and draws under 3 W in normal operation. Its front panel has status LEDs for power, fault, and trip output. Terminals use screw‑clamp connectors rated for 5 A. The housing measures 120 mm × 80 mm × 40 mm and weighs 300 g. It mounts on a standard DIN rail or panel cutout. The electronics start in under 200 ms and can log up to 100 fault events in memory.

The REX010 uses industrial‑grade components on a multilayer PCB for reliable performance. It works in temperatures from –20 °C to +60 °C and resists vibration up to 2 g at 10–150 Hz. It meets IEC 61000‑4 standards for electrostatic discharge (±4 kV) and surge (±2 kV). Inputs include surge protection diodes to guard against spikes. The unit has a user‑settable test mode that forces a fault signal to verify wiring and trip circuits. Engineers use a small push‑button on the front to start self‑tests. No special tools are needed for calibration. A green LED shows normal operation and a red LED flashes on fault. When a trip occurs, a yellow LED lights until a manual reset is pressed.

Recent grid reliability studies show that earth fault protection reduces downtime by up to 30 percent in industrial plants. As smart grids and microgrids grow, the need for fast ground fault detection is rising. A 2025 industry report notes that modular protection units with built‑in diagnostics are in high demand and growing at over 10 percent per year. The REX010 aligns with this trend by offering simple setup, clear status indicators, and event logging for predictive maintenance. Zhangzhou Fengyun Electric Equipment Co., Ltd. is a key distributor of ABB and other top automation brands. The company supplies a wide range of PLC and DCS modules, I/O cards, protection relays, and sensors. With strong import/export channels and ample warehouse stock, Fengyun Electric delivers worldwide. Their technical team provides system integration, on‑site commissioning, and fast after‑sales service. Sales Engineer Amy is ready to assist at +86 153 5902 9662. For more details, visit their official site, explore the product catalog, or reach out via the contact page.

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