Littelfuse JTD400 Indicator Fuse 400A 600VAC 500VDC Slo-Blo Knife-Blade

The JTD Series from Littelfuse provides essential protection for general-purpose circuits, particularly in applications where space is limited, such as mains, feeders, and branch circuits. This innovative range includes indicator fuses that offer superior overload and short circuit protection, significantly reducing the risk of equipment damage. Notably designed for use in motor control centers and fused combination motor controllers, these fuses ensure IEC Type II "No Damage" protection for both IEC and NEMA type motor starters, enhancing reliability. Furthermore, the time-delay characteristics of the indicator fuses minimize nuisance openings, allowing for compatibility across a variety of applications, which can lead to lower fuse inventory costs. The open-fuse indicator window simplifies maintenance by providing immediate visual confirmation of a blown fuse, enabling quick identification and replacement, thereby reducing downtime. Safety is a paramount feature, as the design eliminates the risk associated with live circuit exposure; once the indicator window darkens, it remains that way, regardless of power status, making the JTD Series an excellent choice for any setting requiring robust and reliable circuit protection.

• Provides IEC Type II 'No Damage' motor starter protection
• Time-delay dual-element construction reduces nuisance fuse openings
• Indicator fuse with open-fuse window for quick blown fuse identification
• Indicator window remains dark after fuse blows for increased safety
• High interrupting rating of 20,000 A at 500 V DC for superior short circuit protection
• Suitable for motor control centers and fused combination motor controllers
• Slo-Blo time lag opening provides overload protection without unnecessary interruptions
• Construction materials optimized for durability and conductivity with melamine body and brass/copper components
• Reduces equipment damage by superior overload and short circuit protection
• General purpose circuit protection ideal for space-limited applications

• Amperage: 400 A
• Voltage: 600 V AC, 500 V DC
• Current Type: Time Delay, Dual-element
• Interrupting Rating: 20,000 A @ 500 V DC
• Opening: Slo-Blo/Time Lag (T)/Time Delay
• Material: Body Melamine; Caps Nickel-plated Bronze (1/8–60 A), Brass (70–200 A), Brass Cap with Copper Blade (225–600 A)
• Dimensions: Varies by ampere rating, e.g. 1–30 A: A=2 1/4 in, C=1/2 in, D=3/4 in; 450–600 A: A=5 1/2 in, B=5 3/8 in, C=6 1/2 in, D=8 in, E=2 1/2 in, F=2 in, G=3/4 in, H=7 7/32 in
• Watts Loss at 100% Rated Current: 4.087 W (10 A) to 61.187 W (600 A)
• Watts Loss at 80% Rated Current: 2.418 W (10 A) to 34.983 W (600 A)
• Total Clearing I²t (A² sec) at 200 kA: 820 (3 A) to 1,970,000 (600 A)
• Compliance: UL Listed, CSA Certified, CE (225–600 A), RoHS (225–600 A)
• Standards: UL 248-8, Class J
• Country of Origin: Mexico

Certification

Datasheets