Built around a 1\/2″-28UNEF threaded mounting bush, the MF-527 is a screw-in panel fuse socket for 5x20mm glass or ceramic cartridge fuses. It carries 10A at 250VAC and 10A at 125VDC, and it delivers a 50A breaking capacity for fault isolation.<\/p>\n
What sets this model apart is the imperial thread specification. Many 5x20mm holders rely on metric M12.5 threads; in contrast, the MF-527 uses 1\/2″-28UNEF. This detail matters when your enclosure already follows imperial drill patterns. Moreover, it simplifies replacement of legacy equipment.<\/p>\n
The insulating body comes moulded from PBT polybutylene terephthalate, and it carries UL 94 V0 flame-retardant certification. Current paths run through 0.5mm phosphor copper terminals. We select this material for its spring contact pressure and its resistance to fatigue over repeated fuse swaps.<\/p>\n
Furthermore, the holder passes a 3000VAC dielectric withstand test. It also maintains insulation resistance above 100M\u03a9. Steady contact resistance stays under 5m\u03a9. As a result, on-state losses remain low, and derating under normal load rarely becomes a concern.<\/p>\n
Typical deployments include front-access power entry panels, bench instruments, medical device bays, and industrial rack enclosures. In these applications, an operator may need to swap a cartridge fuse with nothing more than a screwdriver. The threaded bush, together with the supplied hex nut and washer, clamps securely across thin sheet metal or thicker plastic panels.<\/p>\n
Each holder ships with the threaded body, hex nut, and flat washer. We supply terminals in phosphor copper; additionally, we can quote tin-plated versions on request. If your assembly line needs taped leads or special packaging, please mention this during RFQ.<\/p>\n
Datasheet<\/p>\n