Merit Brass A2D175R 175A 250V RK1 Time-delay Fuse

Product Description

The MERIT BRASS A2D175R is a time-delay, Class RK1 fuse rated at 175 amps and 250 volts. It is designed to protect electrical circuits and equipment from overcurrent events while tolerating short-duration inrush currents common in motor and transformer startup. Class RK1 fuses offer a high degree of current limitation, making them a reliable choice for industrial and commercial panel protection. Licensed electricians and electrical contractors typically specify this fuse for branch circuit and feeder protection where both overload and short-circuit protection are required.

The A2D175R fits standard RK1 fuse holders and disconnect switches rated for 250-volt service. It is commonly used in commercial and light industrial applications including motor control centers, distribution panels, and HVAC equipment disconnect boxes. The time-delay characteristic allows the fuse to ride through motor starting inrush without nuisance opening while still providing fast response to sustained fault conditions.

Key Features

• 175-amp continuous current rating for high-load branch circuit protection
• 250-volt rating suitable for single-phase and three-phase distribution systems
• Class RK1 rating provides superior current limitation compared to standard fuse classes
• Time-delay design accommodates motor inrush and transformer magnetizing currents
• 1 per pack — individual unit packaging for single-fuse replacement jobs

Compatibility

Designed for use in Class RK1 fuse holders and fusible disconnect switches rated for 175 amps and 250 volts. Consult the equipment nameplate and fuse holder markings to confirm RK1 class compatibility before installation.

Installation Notes

Installation should be performed by a qualified electrician in accordance with the National Electrical Code (NEC) and applicable local codes. De-energize and lock out the circuit at the upstream disconnect or breaker before removing or installing any fuse. Verify that the fuse holder is rated for Class RK1 fuses and that the replacement amperage matches the circuit protection requirements exactly. Never substitute a fuse of a higher amp rating to bypass a tripping condition without first identifying and correcting the fault.

Technical Specifications

• Amperage: 175 amps
• Voltage: 250 volts
• Fuse Class: RK1
• Fuse Type: Time-Delay
• Dimensions (L x W x H): 7.310 inches x 1.560 inches x 1.560 inches
• Weight: 0.990 pounds
• Quantity per Pack: 1
• UPC: 78200199107

Standard Information

• Brand: MERIT BRASS
• Manufacturer Part Number: A2D175R