Pianet N Slow-Blow Glass Fuse – 5x20mm, 315mA, 250V

A correct-specification replacement fuse for the Hohner Pianet N power circuit. This is a time-delay (slow-blow) glass fuse rated at 315mA (T315mA) and 250V, matching the protection requirements used in many Pianet N units.

The slow-blow characteristic is important in vintage keyboards like the Pianet N. When the power supply energises, there is a brief inrush current from the transformer and filter capacitors. A fast-acting fuse can nuisance-blow under this normal surge. A T-rated (time-delay) fuse tolerates that momentary spike while still protecting the circuit from sustained overcurrent conditions.

Important Compatibility Note

There were multiple variations of the Pianet N produced over its manufacturing run, including differences in power supply configuration depending on region and revision.

Before ordering, please check the value printed directly on your existing fuse. The rating is stamped on the metal end cap (for example: T315mA 250V). Always replace like-for-like unless you are following official service documentation.

Using a higher current fuse risks inadequate protection of the transformer and rectifier section. Using a fast-blow fuse may result in repeated failure during normal startup. The specified T315mA 250V fuse preserves correct protection while maintaining reliability.

When servicing vintage instruments, confirming the installed fuse value is essential to protect both the instrument and yourself.