Mersen OT200 Class K5 Power Fuse 200A 250V

Product Description

The MERSEN OT200 is a Class K5 fast-acting, one-time low-voltage power fuse rated at 200 amperes and 250 volts AC/DC. Designed for reliable overcurrent protection in both AC and DC circuits, it delivers an interrupting rating of 50 kiloamperes AC and 20 kiloamperes DC. The cylindrical body measures 7.125 inches in length and 1.5625 inches in diameter, with blade terminals that seat securely into standard clip-type fuse holders. Licensed electricians and electrical contractors install this fuse as part of panel, feeder, and branch circuit protection work in residential and small commercial settings.

The OT200 is suited for feeder circuits, branch circuits, and resistive heating loads in residential and small commercial installations. Its fast-acting characteristics provide quick response to fault conditions, making it appropriate for applications where downstream equipment or wiring requires prompt overcurrent interruption. The single-use construction means the fuse must be replaced after any operation, which is standard practice for Class K5 one-time fuses of this type.

Key Features

• Class K5 fast-acting, one-time fuse construction for dependable overcurrent protection
• 200 amp current rating at 250 volts AC/DC
• Interrupting rating of 50 kiloamperes AC and 20 kiloamperes DC
• Blade terminal type for use with standard clip-mount fuse holders
• Paper/polyester cylindrical body with copper and tin-plated copper contacts
• Easy-to-read imprint label for quick field identification and replacement

Compatibility

Designed as an OEM-style Class K5 replacement fuse for feeder, branch circuit, and resistive heating applications in residential and small commercial electrical systems with clip-type fuse holders rated for 250 volt, 200 amp service.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and applicable local codes. Always de-energize and verify the circuit is dead before handling or replacing fuses. Confirm the fuse holder is rated for Class K5 blade-terminal fuses at the required voltage and amperage before installing. As a one-time fuse, the OT200 must be replaced after any overcurrent event and must not be bypassed or re-energized without full replacement.

Technical Specifications

• Current Rating: 200 amps
• Voltage Rating: 250 volts AC/DC
• Interrupting Rating: 50 kiloamperes (AC), 20 kiloamperes (DC)
• Fuse Class: Class K5
• Characteristics: Fast Acting, One Time
• Terminal Type: Blade
• Mounting Type: Clip
• Length: 7.125 inches
• Diameter: 1.5625 inches
• Body Material: Paper/Polyester
• Contact Material: Copper/Tin-Plated Copper
• Body Style: Cylindrical
• Approvals: UL 248-9, CSA C22.2
• Package Weight: 0.733 pounds
• Country of Origin: Mexico

Standard Information

• Brand: MERSEN
• Manufacturer Part Number: OT200