Munich Electrification has introduced a solid-state battery disconnect unit for high-voltage systems in electric commercial vehicles.
ME Solid-State Relay is a solid-state battery disconnect unit for high-voltage systems in commercial vehicles.
The Solid-State Relay (ME SSR) serves as a central high-voltage switch between the battery and the vehicle drivetrain. It connects the battery during operation and disconnects it when the vehicle is parked, serviced, or experiences a fault.
The device replaces conventional mechanical contactors and pyrotechnic fuses with solid-state switching. Munich Electrification says the design is intended for the high duty cycles and vibration levels associated with electric trucks and buses.
The ME SSR switches high-voltage circuits in under five microseconds and operates without mechanical contacts. The solid-state design eliminates contact wear and arcing while allowing the protection system to reset after a fault rather than requiring replacement of a single-use fuse.
The device also supports configurable protection and self-testing functions intended to identify latent faults within the high-voltage system.
Two versions are available. The standalone ME SSR is designed for integration into existing battery disconnect units (BDUs). A second version, the ME SSR Next, combines switching and sensor functions in a single module for new vehicle platforms and BDU consolidation.
Munich Electrification says the integrated architecture can reduce the number of components and interfaces required within the battery disconnect system.
The company is expanding its existing battery-management and sensing portfolio with the new high-voltage switching technology. Its current systems include cell monitoring, current and voltage measurement, and battery disconnect functions for commercial vehicle applications.
Munich Electrification will showcase the ME SSR at IAA Transportation 2026 in Hanover, Germany, from September 15 to 20, 2026.
Filed Under: Batteries, Technology News