Littelfuse JTD400ID Class J Fuse – 400A – 600V Time-Delay Indicating Fuse

The Littelfuse JTD400ID is a 400 Amp Class J time-delay fuse designed for high-capacity overcurrent and short-circuit protection in industrial and commercial electrical distribution systems. Part of the JTD_ID series, this POWR-PRO® fuse is engineered to tolerate temporary inrush currents from motors, transformers, and other inductive loads without nuisance opening. The built-in indicating feature provides a clear visual signal of a blown fuse, helping reduce downtime and simplify maintenance.

Electrical Rating

• Current Rating: 400 Amps
• Maximum AC Voltage: 600 VAC
• Maximum DC Voltage: 500 VDC
• Interrupting Rating:
  • 200 kA AC
  • 20 kA DC @ 500 VDC

Key Specifications

• Manufacturer: Littelfuse
• Catalog Number: JTD400ID
• Series: JTD_ID
• Fuse Class: Class J
• Construction Type: Knife-Blade
• Fuse Type: Time-Delay (Slo-Blo)
• Family: POWR-PRO® Fuse
• Indicating: Yes

Protection Characteristics

• Time-delay design accommodates motor starting and transformer inrush currents
• Reliable overload and short-circuit protection
• Reduces nuisance fuse operation in inductive load applications
• Current-limiting performance reduces let-through energy during faults
• High interrupting capacity for demanding industrial systems
• Visual blown-fuse indication improves troubleshooting efficiency

Construction Features

• Compact Class J knife-blade design
• Built-in fuse indication for quick fault identification
• Rugged industrial-grade construction for long service life
• Designed for high-performance electrical distribution systems

Mounting & Compatibility

• Mounting Method: Fuse Block / Holder
• Compatible with standard Class J fuse holders and blocks
• Suitable for switchboards, panelboards, motor control centers, and industrial distribution systems

Applications

• Motor circuits
• Industrial power distribution systems
• Switchboards and panelboards
• Motor control centers (MCCs)
• Transformers and inductive loads
• Branch and feeder protection

Product Data

• Manufacturer: Littelfuse
• Catalog Number: JTD400ID
• Series: JTD_ID
• Fuse Class: Class J
• Family: POWR-PRO® Fuse

Returns are easy

You may return items within 30 days of delivery for a refund.

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