Hardt 4099 Slow-blow Ceramic Fuse 6A 250V 1.25x0.25 in

Product Description

The HARDT 4099 is a slow-acting ceramic fuse rated at 6 amps and 250 volts, sized to the standard 1.25-inch by 0.25-inch form factor common in HVAC controls, light commercial equipment, and electrical panels. The slow-blow design allows brief inrush current to pass without nuisance tripping while still protecting circuits against sustained overloads. Licensed electricians, HVAC technicians, and equipment service professionals install this type of fuse as a direct replacement when troubleshooting blown-fuse conditions in control boards, transformers, and auxiliary equipment circuits.

This fuse fits the widely used 1.25-inch by 0.25-inch cylindrical fuse format found in panel-mount fuse holders, inline fuse blocks, and control-board-mounted fuse clips across residential and light commercial HVAC, refrigeration, and electrical equipment. Its slow-blow characteristic makes it appropriate for motor-control and transformer-protection applications where momentary current spikes occur during startup.

Key Features

• 6-amp rating with slow-acting blow characteristic for inrush-tolerant circuit protection
• 250-volt rating suitable for standard single-phase control and power circuits
• Ceramic body construction for reliable interruption performance
• Standard 1.25-inch by 0.25-inch form factor fits common panel and inline fuse holders
• Direct replacement for blown slow-blow fuses in HVAC controls and light commercial equipment

Compatibility

Designed as a direct replacement for standard 1.25-inch by 0.25-inch slow-blow cylindrical fuses rated at 6 amps and 250 volts in HVAC control boards, transformer secondary circuits, and light commercial electrical equipment fuse holders.

Installation Notes

Fuse replacement should be performed by a qualified electrician or licensed HVAC technician. Always de-energize and lock out the equipment before removing or installing a fuse. Confirm the circuit voltage and current draw are within the fuse rating before reinstallation. Never substitute a higher-rated fuse to bypass a repeated blowing condition — diagnose the underlying fault first.