Bussmann MDA-4-R Time Delay Fuse

Superior Circuit Protection for Demanding Applications

The Bussmann MDA-4-R is a premium time-delay (slow-blow) fuse engineered to provide reliable protection for circuits experiencing temporary inrush currents or startup surges. Designed for 250V AC/DC systems, this 4-amp cartridge fuse combines robust performance with critical safety features to safeguard motors, transformers, and inductive loads.

Key Features

• Time-Delay Design: Withstands initial current surges (5x rated current for 10 seconds) before interrupting sustained overloads or short circuits
• Rejection Base (R-Type): Prevents installation of incorrect fuse ratings with patented slot configuration
• High Interrupt Rating: 10kA AC/DC breaking capacity ensures safety during extreme fault conditions
• Durable Construction: Ceramic body with sand-filled arc quenching for consistent performance
• UV-Resistant Labeling: Clear permanent identification of 4A/250V rating
• Space-Saving: 1/4″ x 1-1/4″ (6.3 x 32mm) dimensions for compact panels

Technical Specifications

Ideal Applications

• Motor control circuits (HVAC compressors, pumps, fans)
• Transformer primaries
• Power supplies and converters
• Lighting ballasts
• Industrial control panels
• Appliance protection circuits

Why Choose MDA-4-R?

Bussmann’s precision-engineered design provides crucial “motor start” tolerance while maintaining UL/CSA compliance. The rejection feature prevents accidental substitution with non-time-delay fuses, ensuring optimal equipment protection and reducing maintenance costs. Backed by Eaton’s global support network.

Installation Note: Always verify voltage/current requirements and consult NEC guidelines before installation. Replace with identical rating only.