Mersen TRS20R Fuse TRS-R - Class RK5 - Time-Delay 600VAC 300VDC 20A Ferrule Tri-Onic®

Description

Features

• The TRS20R is a 20-Amp, 600V Class RK5 Tri-Onic fuse. It features a specialized rejection notch in the blade, ensuring it fits into any standard Class R fuse block or disconnect switch while preventing the accidental installation of non-rejection fuses with lower interrupting ratings.
• Engineered with advanced time-delay properties, the TRS20R is designed to "ride through" the temporary high inrush currents of motors and transformers. This prevents nuisance tripping during equipment startup, while still providing reliable, long-term protection against sustained overloads that could damage motor windings.
• As a current-limiting fuse, the TRS20R reacts in less than half a cycle during a short circuit to significantly limit the peak "let-through" energy (I^2t). This protects downstream components like contactors and circuit breakers from the massive thermal and magnetic stresses of a fault, often allowing for Type 2 "No Damage" protection.
• With a massive 200,000 Amp RMS interrupting rating, this fuse can be safely applied in locations with very high available fault current. It provides a robust safety margin for industrial and commercial service entrances, ensuring the fuse can safely clear a catastrophic short circuit without exploding.
• The Mersen TRS20R is UL Listed to Standard 248-12 and CSA Certified. Its dual-element design provides the ultimate balance of time-delay and high-speed protection, making it the industry standard for complying with NEC and CEC requirements for motor branch circuit and feeder protection.

Documentation & Downloads

Specifications