Littelfuse KLPC1200 Class L Fuse – 1200A – 600V Time-Delay POWR-PRO™ Fuse

The Littelfuse KLPC1200 is a 1200 Amp Class L time-delay fuse engineered for superior overcurrent and short-circuit protection in high-capacity industrial and commercial electrical systems. Part of the premium POWR-PRO™ KLPC series, this specification-grade fuse delivers exceptional performance, reliability, and current-limiting protection for critical power distribution applications.

KLPC series fuses are manufactured using 99.9% pure silver fuse links, silver-plated copper end bells, glass-reinforced melamine bodies, O-ring seals, and granular quartz fillers. They are the only UL Listed Class L fuses that provide a minimum 10-second time delay at 500% rated current while maintaining current-limiting performance comparable to the fastest Class L fuses available.

Electrical Rating

• Current Rating: 1200 Amps
• Maximum AC Voltage: 600 VAC
• Maximum DC Voltage: 480 VDC
• Interrupting Rating:
  • 200 kA AC @ 600 VAC
  • 300 kA AC @ 600 VAC
  • 20 kA DC @ 480 VDC

Key Specifications

• Manufacturer: Littelfuse
• Catalog Number: KLPC1200
• Series: KLPC
• Fuse Class: Class L
• Construction Type: Bolt-In
• Fuse Type: Time-Delay (Slo-Blo)
• Family: POWR-PRO™ Fuse
• Indicating: No

Protection Characteristics

• Minimum 10-second time delay at 500% rated current
• Handles motor starting currents and transformer inrush currents without nuisance operation
• Advanced current-limiting design minimizes fault energy and equipment damage
• Peak let-through currents approximately 10% lower than other time-delay Class L fuses
• High interrupting capacity for maximum fault protection
• Provides excellent feeder, motor, transformer, and service entrance protection
• Supports selective coordination in complex power distribution systems

Construction Features

• 99.9% pure silver fuse elements
• Silver-plated copper end bells
• Glass-reinforced melamine fuse body
• O-ring seals between body and end bells
• Granular quartz filler for superior arc suppression
• Heavy-duty bolt-in Class L construction
• Non-indicating configuration

Features & Benefits

• Specification-grade performance for critical applications
• Current-limiting protection reduces short-circuit damage to equipment
• Excellent coordination with downstream protective devices
• Longer equipment life through reduced thermal and mechanical stress
• Reliable operation in demanding industrial environments
• Meets or exceeds UL Class L requirements and stringent project specifications

Mounting & Compatibility

• Mounting Method: Bolt-In
• Compatible with Class L fuse clips, fuse blocks, and mounting hardware
• Suitable for switchgear, switchboards, service entrances, and large distribution systems

Applications

• Main service entrance protection
• Large feeder circuits
• Industrial power distribution systems
• Motor control centers (MCCs)
• Transformers and large inductive loads
• Commercial and utility electrical systems
• Critical infrastructure requiring specification-grade protection

Product Data

• Manufacturer: Littelfuse
• Catalog Number: KLPC1200
• Product Type: Time-Delay Current-Limiting Fuse
• Series: KLPC
• Fuse Class: Class L
• Family: POWR-PRO™ Fuse