Mersen A2K50R 250V Class RK1 Time-delay Fuse 50A 10 Pack

Product Description

The MERSEN A2K50R is a 250-volt, 50-amp Class RK1 time-delay fuse designed for branch circuit and equipment protection in commercial and industrial electrical systems. Class RK1 fuses provide a high degree of current limitation, reducing let-through energy during fault conditions. The time-delay characteristic allows motors and other inductive loads to start without nuisance blowing while still providing fast response to sustained overloads and short circuits. Licensed electricians install this fuse type in fusible disconnect switches, motor control panels, and load centers where NEC requirements call for current-limiting overcurrent protection.

This fuse is suited for residential and commercial applications requiring Class RK1 current-limiting performance at 250 volts AC. Typical installations include motor branch circuits, HVAC equipment disconnects, and general-purpose feeder protection. The A2K50R is packaged in a 10-unit pack, making it practical for stocking in service vehicles or panel shops. Where equipment nameplates specify a Class RK1 fuse at 50 amps and 250 volts, this part meets that requirement directly.

Key Features

• Class RK1 current-limiting design reduces fault let-through energy
• Time-delay action tolerates motor inrush without nuisance opens
• Rated 50 amps at 250 volts AC
• Packaged 10 fuses per pack for efficient stocking
• Rejection-style end caps prevent installation in lower-rated fuse holders

Compatibility

Designed as an OEM-style replacement for Class RK1 fusible disconnect and motor-circuit applications rated at 250 volts and 50 amps where a time-delay fuse is specified.

Installation Notes

Installation must be performed by a licensed electrician in accordance with NEC Article 240. Always open and lock out the disconnect or panel before handling fuses. Verify that the fuse holder is rated for Class RK1 rejection-style fuses before installation. Do not substitute a Class RK5 or non-current-limiting fuse where Class RK1 is required by the equipment nameplate or design drawings.

Technical Specifications

• Voltage Rating: 250 volts
• Amperage Rating: 50 amps
• Fuse Class: RK1
• Fuse Type: Time-Delay
• Package Quantity: 10 per pack
• Package Dimensions (L x W x H): 4.25 inches x 3.12 inches x 1.69 inches
• Weight: 0.14 pounds
• UPC: 78200191515

Standard Information

• Brand: MERSEN
• Manufacturer Part Number: A2K50R