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.

WARNING: This product can expose you to chemicals including lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.