HSJ400 – Mersen | 600V 400A CLASS J HS FUSE

Description

The Mersen HSJ400 is an advanced 400A high-speed Class J fuse from the Amp-Trap® HSJ series, engineered to combine strict UL branch-circuit performance with exceptionally low I2t semiconductor protection. Rated for 600 VAC and 500 VDC, it protects sensitive power electronics such as diodes, SCRs, GTOs, and solid-state relays while satisfying standard NEC feeder and branch circuit requirements.

Featuring a robust blade-type terminal design with brass connections, the HSJ400 offers a high-breaking interrupting capacity of up to 200 kA. Built with a durable GMG body, it measures 2.13″ in diameter and 7.13″ in length (54 x 181.1 mm) and is designed for standard clip mounting.

Key Features

• Dual Protection Performance: Combines low I2t semiconductor protection with standard UL Class J branch-circuit performance into a single compact fuse.
• High Voltage Ratings: Certified for up to 600 VAC and 500 VDC to accommodate demanding AC and DC power distribution architectures.
• Exceptional Interrupting Capacity: Provides up to 200 kA AC max breaking capacity (I.R.) for superior fault clearance.
• Brass Terminals: Blade-type connections ensure low resistance, excellent thermal conductivity, and long-term corrosion resistance.
• Semiconductor & Branch Safe: Ideal for safeguarding power electronics (SCRs, diodes, SSRs) while complying with NEC installation standards.

Specifications