Bussmann LPS-RK-90SP Time Delay Fuse

Bussmann LPS-RK-90SP Time Delay Fuse

Optimal Circuit Protection with Precision Delay

Overview

The Bussmann LPS-RK-90SP is a high-performance time-delay fuse designed for reliable overcurrent protection in demanding electrical systems. Engineered for compatibility with 90-ampere circuits, this fuse combines robust interrupting capacity with selective coordination to safeguard motors, transformers, and sensitive branch circuits. Its dual-element design ensures immunity to nuisance tripping during harmless inrush currents while delivering rapid response to genuine fault conditions.

Key Features

• Time-Delay Functionality
  Tolerates temporary startup surges (e.g., motor inrush) without interruption, minimizing operational downtime.
• High Interrupting Rating
  200kA breaking capacity at 600V AC, ensuring reliable protection against short circuits and overloads.
• Class RK5 Compliance
  Compact dimensions (1-1/2″ x 13/32″) allow drop-in replacement in existing Class RK fuseholders, saving retrofit costs.
• Dual-Element Construction
  Thermal-responsive element for overloads + fast-acting link for short circuits—optimizing safety without false trips.
• Tin-Plated Terminals
  Corrosion-resistant contacts maintain conductivity and longevity in humid or industrial environments.

Applications

Ideal for:

• Motor control centers (MCCs)
• HVAC systems & industrial machinery
• Power distribution panels
• Transformers and feeder circuits
• Branch circuits requiring coordination with upstream protection

Specifications

• Ampere Rating: 90A
• Voltage Rating: 600V AC
• Interrupt Rating: 200,000A
• Dimensions: 1.5″ x 0.4″ (38.1mm x 10.3mm)
• Standards: UL 248-5, CSA

Why Choose LPS-RK-90SP?

Bussmann’s legacy of innovation ensures this fuse exceeds industry reliability benchmarks. The time-delay characteristic prevents unnecessary outages during routine operations, while the RK5 form factor simplifies maintenance. Trusted by electricians and engineers globally, it’s the definitive solution for balancing equipment safety with operational continuity.

Part of Eaton’s Bussmann Series—setting the standard in electrical protection since 1914.