Merit Brass TR3/10R Time-delay Fuse 0.3A 250V RK5 10-pack

Product Description

The MERIT BRASS TR3/10R is a Class RK5 time-delay fuse rated at 0.3 amps and 250 volts. Time-delay fuses are designed to withstand brief inrush currents during motor startup while still providing reliable overcurrent protection under sustained fault conditions. This fuse is sold in a pack of 10 units, making it practical for service vehicles and shop stock. Licensed electricians and HVAC technicians install Class RK5 fuses in control circuits, motor branch circuits, and equipment disconnect panels where inrush tolerance is required. The RK5 rejection-style form factor prevents misapplication of lower-class fuses in the same fuseholder.

Class RK5 time-delay fuses are commonly installed in residential and light commercial applications, including HVAC equipment control circuits, small motor loads, and panel disconnects. The 0.3 amp rating suits low-current control or instrumentation circuits where nuisance tripping from harmless inrush is a recurring issue. This product arrives in a 10-count pack, well suited for contractors who replace fuses routinely during preventive maintenance or service calls.

Key Features

• Class RK5 rejection-style form factor prevents substitution with lower-rated fuse classes
• Time-delay design tolerates motor inrush without nuisance tripping
• Rated 0.3 amps at 250 volts for low-current control circuit protection
• Sold in a 10-count pack for efficient field and shop stock management
• Compact dimensions suitable for standard RK5-rated fuseholders and disconnects

Compatibility

Designed as a standard Class RK5 time-delay replacement fuse for use in 250-volt fuseholders accepting the RK5 rejection form factor in residential and light commercial electrical and HVAC control circuit applications.

Installation Notes

Installation must be performed by a qualified electrician in accordance with the National Electrical Code (NEC). Always de-energize and verify zero voltage at the fuseholder before removing or installing any fuse. Confirm the fuseholder is rated for Class RK5 and that the circuit voltage and amperage do not exceed the fuse rating. Do not attempt to substitute a different fuse class or ampere rating to compensate for repeated tripping; diagnose and correct the root cause fault first.

Technical Specifications

• Ampere Rating: 0.3 amps
• Voltage Rating: 250 volts
• Fuse Class: RK5
• Fuse Type: Time-Delay
• Quantity per Pack: 10
• Length: 3.000 inches
• Width: 2.060 inches
• Height: 1.190 inches
• Weight: 0.530 pounds
• UPC: 78200174753

Standard Information

• Brand: MERIT BRASS
• Manufacturer Part Number: TR3/10R