Merit Brass A2D250R 250V RK1 Time-delay Fuse 250A

Product Description

The MERIT BRASS A2D250R is a 250-volt, Class RK1 time-delay fuse rated for high-current protection in demanding electrical systems. Time-delay fuses of this class allow brief inrush currents during motor startup while still providing fast, reliable protection against sustained overloads and short circuits. The RK1 classification indicates a rejection-style cartridge design that prevents accidental substitution with lower-rated fuse classes, adding an important layer of circuit safety. This fuse is installed by licensed electricians and maintenance electricians working on industrial, commercial, and heavy-duty residential electrical panels and motor branch circuits.

Class RK1 time-delay fuses are commonly used in motor control centers, disconnect switches, and panelboards where motor loads require inrush tolerance without sacrificing overcurrent protection. At 250 volts, this fuse is appropriate for single-phase and three-phase circuits within that voltage range. The rejection-slot cartridge body ensures it can only be installed in RK1-rated fuse holders, reducing the risk of improper substitution during service calls and routine maintenance.

Key Features

• Class RK1 rejection-style cartridge prevents substitution with lower-rated fuse classes
• Time-delay design tolerates motor inrush current while protecting against sustained overloads
• Rated for 250-volt circuits in single-phase and three-phase applications
• Packaged individually for straightforward single-fuse replacement jobs
• Compact cartridge form factor fits standard RK1 fuse holders and disconnect switches

Compatibility

Designed as an OEM-style replacement for Class RK1 fuse holders and disconnect switches rated at 250 volts in commercial and industrial electrical systems.

Installation Notes

Installation must be performed by a qualified, licensed electrician in accordance with the National Electrical Code (NEC). Always de-energize and lock out the circuit at the upstream disconnect before removing or installing any fuse. Verify that the fuse holder is rated for Class RK1 cartridges before installation. Never bypass or substitute a lower-class fuse in an RK1-rated holder.

Technical Specifications

• Voltage Rating: 250 volts
• Fuse Class: RK1
• Fuse Type: Time-Delay
• Package Quantity: 1 per pack
• Dimensions (L x W x H): 8.810 inches x 2.120 inches x 2.120 inches
• Weight: 2.010 pounds
• UPC: 78200199112

Standard Information

• Brand: MERIT BRASS
• Manufacturer Part Number: A2D250R