SCHURTER UMT-H surface mount fuse

SCHURTER’s UMT-H surface mount ceramic fuse family now includes 40 and 50 A current ratings with a breaking capacity rating of 500 A at 125 VAC/72 VDC. The series provides robust overcurrent and short circuit protection performance in a package size of 5.3 x 16 mm.

The series was originally developed to provide a smaller alternative to through-hole mounted 5 x 20 mm cartridge fuses often used for primary circuit protection. The range has since grown to include 26 rated currents from 160 mA to 50 A. Rated voltage is maximum 277 VAC/250 VDC, with an interrupt capacity rating of 1500 A for current ratings up to 6.3 A. The Time-Lag T characteristic withstands high inrush and pulse currents.

The series has evolved to include higher current ratings to meet more markets for secondary protection in battery-powered applications. Areas of application are widespread, from motors to emerging applications such as those reliant on energy accumulators and everything in between. The fuse is useful for many applications in energy, data, medical, industrial control and automotive to name a few. It is also impermeable to conformal coatings, and thus a suitable candidate for use in ATEx and IECEx rated devices for hazardous environments.

A variety of breaking capacity measurements are performed on the product at specific solder trace widths. The admissible ambient temperature range is -55 to +125°C. Large solder pads are added for optimal heat dissipation.

The fuse is designed according to IEC 60127-7 and UL 248-14 and carries VDE and cURus approvals. IEC, MIL-STD 202 and AEC-Q200 tests apply.