Merit Brass TR1-1/8R Time Delay Fuse 1-1/8A 250V RK5

Product Description

The MERIT BRASS TR1-1/8R is a time delay fuse rated at 1-1/8 amps and 250 volts in an RK5 fuse class configuration. Time delay fuses of this type are designed to handle brief inrush currents without nuisance tripping while still providing reliable overcurrent protection for downstream components. The RK5 class designation indicates a rejection-style fuse body that prevents installation of a lower-rated class fuse in the same holder, adding an additional layer of circuit protection. Licensed electricians and HVAC technicians commonly install fuses of this type when servicing control circuits, motor branch circuits, and equipment disconnect panels.

This fuse is suited for use in residential and light commercial electrical panels, equipment disconnects, and fused load centers where a 250-volt, 1-1/8-amp time delay overcurrent device is specified. The RK5 class is widely used in HVAC equipment, motor control, and general electrical distribution applications where inrush tolerance is required without sacrificing short-circuit protection.

Key Features

• 1-1/8 amp current rating with time delay characteristic for inrush tolerance
• 250-volt voltage rating suitable for single-phase branch circuits
• RK5 rejection-class body prevents substitution with lower-rated fuse classes
• Compact form factor fits standard RK5-compatible fuse holders and disconnects

Compatibility

Designed as an OEM-style replacement for RK5-class time delay fuses in standard 250-volt fuse holders and disconnect blocks rated for the RK5 fuse class.

Installation Notes

Installation should be performed by a licensed electrician or qualified HVAC technician in accordance with NEC requirements for overcurrent protection devices. Always de-energize and lock out the circuit at the disconnect or panel before replacing any fuse. Verify the replacement fuse matches the amperage, voltage, and fuse class specified on the equipment nameplate. Never install a fuse with a higher amperage rating than the circuit is designed for.

Technical Specifications

• Current Rating: 1-1/8 amps
• Voltage Rating: 250 volts
• Fuse Class: RK5
• Fuse Type: Time Delay
• UPC: 78200174759

Standard Information

• Brand: MERIT BRASS
• Manufacturer Part Number: TR1-1/8R