Electronic Fuse Monitor, OFM, OFS and OFD Series

The OFM, OFS, and OFD fuse monitors provide immediate tripping options after a blown fuse, preventing 2-phase motor loading and unsafe neutral voltages. Operating without external supply voltage, they cover a wide voltage range (100V-260VAC, 380V-690V, and 45V-550VDC) and function effectively even with phase unbalance. These monitors are versatile, compatible with standard fuses, and offer clear blown fuse indication. They automatically reset after blown fuses have been replaced, ensuring continuous operation. Safety is paramount, with rigorous testing including a 9.8kV impulse voltage test and 5kV/1min voltage test, and double-insulated wires on the supply side for reliable operation.