Electronic Products & Technology

SMD circuit protector delivers as fail-safe device

March 10, 2020  Stephen Law

SCHURTER UMT-W pulse-proof SMD ceramic fuse with super time-lag tripping characteristics is suitable as a fail-safe device in demanding applications. The cuboid shaped (5.3 x 16 mm), compact SMD fuse is available in five rated currents from 5A to 20A and reaches rated voltages of up to 125Vac & dc with a breaking capacity of up to 1000A. This combination provides a slow and precisely defined melting characteristic for an SMD fuse. Device is recommended wherever high inrush currents flow (e.g. motor control systems) and is particularly suitable for applications with long wires (e.g. avionics), which are often primarily protected by an electronic fuse. If this monitoring fails, or does not perform its task correctly, the UMT-W takes over as a fail-safe device, and transfers the system to a safe, current-less state. Due to the precise melting times, with its precisely defined min/max corridor at 4xIn, robust and selective safety concepts can be implemented on top of the electronic fuse. 

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