SCHURTER Pyrofuse-APO Series

SCHURTER has launched the Pyrofuse-APO Series, a fuse technology that is designed to operate actively and enhance safety. In the event of a short circuit or accident, the control unit sends a trigger signal to an integrated micro gas generator. Within milliseconds, the generator produces high pressure that drives a piston to mechanically sever the solid copper busbar. The resulting arc is safely suppressed in a dedicated extinguishing chamber. The outcome is a complete galvanic isolation in less than two milliseconds — with measured values as fast as 0.9 ms.

The APO Series is rated for operating voltages up to 1000 V and continuous currents up to 400 A. With an ultra-low internal resistance in the range of only a few dozen microohms (µΩ), power losses and temperature rise remain minimal. Its high breaking capacity facilitates safe interruption even under extreme short-circuit conditions, while the fully encapsulated design prevents the release of gases or particles.

This combination of speed, robustness and efficiency is designed to enable maximum system safety. At the same time, the compact design allows for integration into existing architectures and relieves downstream components such as contactors.