Merit Brass TRS4/10R Time-delay Fuse 0.4A 600V RK5

Product Description

The MERIT BRASS TRS4/10R is a time-delay fuse rated at 0.4 amps and 600 volts, classified under the RK5 fuse standard. Time-delay fuses of this type are designed to withstand brief inrush currents common in motor and transformer circuits while still providing reliable overcurrent protection. The RK5 classification indicates a rejection-style fuse body that prevents installation in non-RK-rated fuse holders, adding a layer of misapplication protection. Electricians and maintenance technicians use this fuse in control panels, HVAC equipment, and light commercial electrical systems where precise, low-amperage protection is required.

This fuse is suited for residential and light commercial applications where low-amperage branch circuit or equipment protection is needed. Typical install scenarios include motor control circuits, transformer secondary protection, and HVAC control circuit protection where inrush tolerance is critical. The 600-volt rating provides headroom for standard single-phase and three-phase distribution systems commonly found in commercial electrical panels and packaged equipment.

Key Features

• 0.4-amp (4/10A) rating for precise low-amperage overcurrent protection
• 600-volt rating suitable for single-phase and three-phase systems
• RK5 class rejection fuse body prevents installation in non-compatible holders
• Time-delay design tolerates motor and transformer inrush currents
• Compact form factor for control circuit and panel applications

Compatibility

Designed as an OEM-style replacement for RK5-class time-delay fuses in residential and light commercial electrical control panels and HVAC equipment.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC). Always de-energize and lock out the circuit before replacing a fuse. Verify the replacement fuse matches the amperage, voltage, and class markings of the original before installation. Do not substitute a non-rejection fuse in an RK5-rated fuse holder.

Technical Specifications

• Amperage Rating: 0.4 amps (4/10A)
• Voltage Rating: 600 volts
• Fuse Class: RK5
• Fuse Type: Time-Delay (TD)
• UPC: 78200174854

Standard Information

• Brand: MERIT BRASS
• Manufacturer Part Number: TRS4/10R