Cooper Bussmann MDA-1-1/4-R Cartridge Time Delay Fuse 1.25A

Product Description

The COOPER BUSSMANN MDA-1-1/4-R is a ceramic cartridge time delay fuse rated at 1.25 amps and 250 volts. It measures 1.25 inches in overall length and 0.25 inches in diameter, placing it in the standard mini fuse body class. The time delay characteristic allows brief inrush currents to pass without nuisance tripping while still protecting the circuit from sustained overcurrent faults. Licensed electricians and electronics technicians typically install this fuse in control circuits, instrumentation panels, and low-current branch circuits where precise overcurrent protection is required. Its ceramic body provides strong thermal resistance during fault events.

This fuse is suited for residential and light commercial control circuit applications, instrumentation equipment, and industrial panel boards requiring compact overcurrent protection. The 250-volt rating makes it appropriate for single-phase low-voltage control wiring and signal circuit protection. It is commonly installed in fuse holders and fuse blocks that accept 0.25-inch diameter cartridge fuses. Installers working on HVAC control boards, small appliance circuits, and test equipment panels will find this fuse format a standard fit for those applications.

Key Features

• Time delay action accommodates motor start inrush and transformer inrush without nuisance blowing
• Ceramic body construction provides high thermal durability during fault interruption
• 1.25-amp rating suitable for low-current control and instrumentation circuits
• 250-volt rating covers standard single-phase low-voltage control applications
• Compact mini cartridge form factor: 1.25 inches OAL x 0.25 inches diameter
• UL Listed, CSA Certified, MIL-STD-202 Method 204 tested, and RoHS compliant

Compatibility

Designed as an OEM-style replacement cartridge time delay fuse for fuse holders and fuse blocks accepting 0.25-inch diameter mini cartridge fuses rated up to 250 volts.

Installation Notes

Installation should be performed by a qualified electrician or instrumentation technician in accordance with the NEC and applicable local codes. Always de-energize and verify zero voltage on the circuit before replacing any fuse. Confirm that the replacement fuse amperage and voltage ratings match or are appropriate for the circuit being protected. Do not substitute a fast-acting fuse where a time delay type is specified, as nuisance blowing or inadequate circuit protection may result.