Mersen TRM3-1/2 Midget Time-delay Fuse 3.5A 250V

Product Description

The MERSEN TRM3-1/2 is a 250-volt midget time-delay fuse rated at 3.5 amps, designed for overcurrent protection in compact control circuits and low-amperage branch circuits. The time-delay characteristic allows the fuse to ride through brief inrush currents common in motor-start and transformer applications without nuisance blowing, while still providing reliable short-circuit protection. Sold in a 10-pack, this midget fuse fits standard 13/32-inch x 1-1/2-inch midget fuse holders found throughout HVAC control panels, process equipment, and electrical enclosures. Licensed electricians and HVAC technicians are the primary installers.

This fuse is commonly used in residential and light commercial HVAC systems, motor control centers, and industrial control panels where low-amperage overcurrent protection is required in a compact form factor. Typical applications include transformer secondary circuits, control circuit protection, and small fractional-horsepower motor branch circuits where a standard full-size fuse block is not practical or space-appropriate.

Key Features

• Time-delay design accommodates motor inrush and transformer energizing currents without nuisance opens
• 250-volt rating covers standard single-phase control circuit applications
• 3.5-amp current rating for low-amperage branch and control circuit protection
• Midget form factor fits 13/32-inch x 1-1/2-inch fuse holders standard in HVAC and industrial panels
• Sold as a 10-pack for stocking and service-call convenience

Compatibility

Designed as an OEM-style replacement midget time-delay fuse for use in standard 13/32-inch x 1-1/2-inch midget fuse holders in HVAC control panels, motor control circuits, and electrical enclosures rated for 250 volts or less at 3.5 amps or less.

Installation Notes

Installation should be performed by a licensed electrician or qualified HVAC technician in accordance with NFPA 70 (NEC) requirements for overcurrent protection. Always de-energize the circuit and verify the absence of voltage with a meter before replacing a fuse. Confirm that the replacement fuse matches the circuit voltage rating and amperage exactly — never substitute a higher-rated fuse. Fuse holders should be inspected for damage, corrosion, or loose contacts during each replacement service.

Technical Specifications

• Voltage Rating: 250 volts
• Current Rating: 3.5 amps
• Fuse Type: Midget Time-Delay
• Quantity per Pack: 10
• Dimensions (L x W x H): 1.62 inches x 0.88 inches x 2.12 inches
• Weight: 0.13 pounds
• UPC: 78200174339

Standard Information

• Brand: MERSEN
• Manufacturer Part Number: TRM3-1/2