Over-Current Protection for Primary and Secondary Circuits
14 December 2009
In niche markets with limited space, customers might look for a solution where SMD fuses should be replacable without soldering. For this reason the successful standard UMT 250 has been extended with a clip option.
The UMZ 250 offers time-lag characteristic according to IEC 60127-4 and is a universal modular fuse (UMF) with rated current values from 315mA to 4A. The product provides a high breaking capacity of up to 200A at 250VAC. The clip option allows a customer fuse replacement with the benefit that only the UMT 250 fits. This has the advantage that the technical specification, in contrast to a 5mmx20mm solution, does not vary and spare fuses could be sold through the equipment manufacturer.
With this setup the manufacturer receives important information about equipment failures in the field. Gold caps are required in order that the clip and the fuse are not soldered together in the reflow soldering process. As replacement, the standard UMT 250 can be used instead.
Technical features:
- Current range: 315mA to 4A
- Rated voltage: 250VAC, 125VDC
- Time-lag characteristic according to IEC 60127-4
- Breaking capacity of 200A at 250VAC according to IEC and for 35A at 250VDC according to UL
