Overview
Ferraz Shawmut AJT90 is an Amp-Trap® 2000® Class J current-limiting, time-delay power fuse designed for industrial distribution systems. Rated for 90A at 600VAC/500VDC with a 200/100 kA interrupt rating, this fuse combines compact dimensions with superior overcurrent protection. It requires only half the mounting space needed for 600VAC Class RK fuses, making it an efficient choice for space-constrained electrical panels.
Key Features
- Time-Delay Protection: Ideal for handling typical motor and transformer inrush currents while providing superior current-limiting ability
- SmartSpot® Visual Indicator: Features a solid-state visual open fuse indicator for instant blown fuse recognition
- High Interrupt Rating: 200 kA at 600VAC and 100 kA at 500VDC for robust short-circuit protection
- IEC Type 2 No-Damage Protection: Provides no-damage protection to main, feeder, and branch circuits for all types of loads
- Compact Class J Form Factor: Unique Class J dimensions prevent misapplication and installation errors
- Easy Selectivity: Enables 2-to-1 coordination with downstream protection devices to minimize nuisance shutdowns
Technical Specifications
The AJT90 meets UL/CSA standards for critical industrial applications with proven reliability across North American electrical systems.
Typical Applications
- Motor branch circuits and motor control centers
- Transformer primary and secondary protection
- Main and feeder distribution circuits
- Industrial manufacturing equipment with inductive loads
- HVAC systems and large fan motors
- Power distribution panels in commercial and industrial facilities
Compatibility & Replacements
Compatible With
- Class J fuse holders and clip mounts (standard blade terminal, bolted or clip configuration)
- Industrial electrical panels and distribution centers rated for 600VAC or 500VDC
- Motor control centers (MCCs) with Class J fuse blocks
- UL/CSA compliant electrical systems
Replaces / Drop-In Replacement For
- Comparable to Eaton Cooper Bussmann LPJ-90SP
- Ferraz Shawmut earlier-generation 90A Class J fuses
- Verify compatibility with your system before ordering—Class J form factor ensures proper fit in Class J holders only
Works With
- Class J fuse blocks and holders (all manufacturers)
- Standard industrial control systems and panel boards
- UL 508 industrial control panel designs
- Motor soft-starters and VFDs (as branch circuit protection)
