Cooper Bussmann BP/MDL-4 Time Delay Glass Fuse 4A 2 Pack

Product Description

The COOPER BUSSMANN BP/MDL-4 is a Type MDL time delay glass tube fuse rated at 4 amps and 250 volts, sold in a 2-pack carded format. The MDL designation identifies this as a slow-blow fuse designed to tolerate brief inrush currents without nuisance opening, making it well suited for electronic controls and instrumentation circuits. The glass tube body measures 1/4 inch in diameter by 1-1/4 inch in length, a standard form factor stocked by most electrical and HVAC supply houses. Licensed electricians and electronics technicians are the primary installers, though HVAC technicians frequently encounter this fuse in low-voltage control boards and electronic equipment.

This fuse is used in electronic equipment, control panels, and instrumentation where a time delay characteristic is required to ride through momentary surge currents at startup. The 250-volt rating covers both standard 120-volt and 240-volt circuits within its amperage class. The carded 2-pack format is intended for retail and trade counter sales, providing a spare on hand for field service calls where a single fuse replacement is the common repair task.

Key Features

• Type MDL time delay (slow-blow) characteristic tolerates inrush current without nuisance opening
• Glass tube body allows visual inspection of the fuse element without a meter
• Standard 1/4 inch x 1-1/4 inch body fits commonly available fuse holders and panels
• 250-volt rating suitable for both 120-volt and 240-volt electronic control applications
• Sold as a carded 2-pack for convenient field carry and immediate spare availability

Compatibility

Designed as a standard replacement for Type MDL time delay glass tube fuses in electronic equipment, control panels, and instrumentation using 1/4 inch x 1-1/4 inch fuse holders rated up to 250 volts.

Installation Notes

Fuse replacement should be performed by a qualified electrician or service technician. Always de-energize the circuit and verify with a meter that voltage is absent before removing or inserting a fuse. Confirm that the replacement fuse matches the exact amperage, voltage, and time delay type specified on the equipment nameplate or wiring diagram. Never substitute a higher-amperage fuse or a fast-blow type where a time delay fuse is specified, as this can damage equipment or create a safety hazard.