JTD300 - 300 Amp Fuse

JTD300 - 300 Amp Fuse

The JTD300 is a 300A Class J time-delay fuse designed around a specific combination of electrical ratings, opening characteristics, and knife-blade construction. It belongs to the JTD Series and POWR-PRO Fuse family, with Slo-Blo/Time Lag (T)/Time Delay operation and maximum voltage ratings of 600VAC and 500VDC. If you're replacing an existing JTD300, don't stop at the 300-amp rating: matching the Class J designation, time-delay operation, voltage and interrupting requirements, physical construction, and mounting arrangement is just as important.

Key Features and Benefits

• 300A continuous current rating for equipment requiring a 300-amp fuse
• Class J fuse configuration
• Time-delay operation specified as Slo-Blo/Time Lag (T)/Time Delay
• Maximum 600VAC rating
• Maximum 500VDC rating
• Knife-blade construction provides a clear physical characteristic to check when matching a replacement
• Part of the JTD Series
• Identified as a POWR-PRO Fuse family product
• Non-indicating configuration
• Designed for mounting using a fuse block, clip, or holder
• LFJ60400 Series is the specified holder family

Technical Specifications

• Catalog Number: JTD300
  
• Series: JTD
  
• Manufacturer Description: FUS 600V T/D CLASS J 300A
  
• Product Type: Class J Time-Delay Fuse
  
• Continuous Current Rating: 300A
  
• Maximum AC Voltage: 600VAC
  
• Maximum DC Voltage: 500VDC
  
• AC Interrupting Value 1: 200,000A at 600VAC
  
• AC Interrupting Value 2: 300,000A at 600VAC
  
• DC Interrupting Rating: 20,000A at 500VDC
  
• Published Interrupting Rating: 20 kA at 500VDC
  
• Opening Characteristic: Slo-Blo / Time Lag (T) / Time Delay
  
• Fuse Class: Class J
  
• Family Style: POWR-PRO Fuse
  
• Construction / Size: Knife-Blade
  
• Indicating: No
  
• Mounting Method: Fuse Block / Clip / Holder
  
• Specified Holder Series: LFJ60400 Series
  

Material Compliance and Certifications

The supplied product information confirms the JTD300's Class J designation, 300A continuous current rating, AC and DC voltage ratings, time-delay opening characteristic, interrupting values, knife-blade construction, and mounting details.

Where It Works Best

The JTD300 suits electrical equipment that requires a 300A Class J time-delay fuse with matching electrical and physical specifications. For AC service, verify the equipment requirements against the 600VAC maximum rating and the applicable manufacturer-supplied AC interrupting value. For DC service, check the 500VDC maximum rating and 20 kA interrupting rating at 500VDC.