APO Pyro Fuse

SCHURTER APO fuse operates actively, unlike conventional fuses. 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, driving 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 2 milliseconds with measured values as fast as 0.9 ms.

The APO series is rated for operating voltages up to 1000 volts and continuous currents up to 400 amperes. With an ultra-low internal resistance of only a few dozen micro-ohms, power losses and temperature rise remain minimal. Its high breaking capacity ensures safe interruption even under extreme short-circuit conditions, while the fully encapsulated design prevents the release of gases or particles.

This unique combination of speed, robustness, and efficiency guarantees maximum system safety. At the same time, the compact design enables seamless integration into existing architectures and relieves downstream components such as contactors.

With the pyro fuse APO series, Schurter strengthens its position as a technology partner for e-mobility and the energy transition. Whether in electric vehicles, aerospace applications, or stationary storage systems, the APO fuse ensures that high-voltage systems remain reliably protected, even under the most demanding conditions.