FLSR040 - 40 Amp Fuse

FLSR040 - 40 Amp Fuse

The FLSR040 is a 40A Class RK5 time-delay fuse designed for industrial and commercial electrical applications where dependable overcurrent protection is essential. Rated for up to 600VAC and 300VDC, it uses a dual-element, time-delay design that can handle brief startup or inrush currents without opening unnecessarily. That’s especially useful around equipment where a short current surge is simply part of normal operation. If you’re replacing an existing FLSR040, the important details are easy to identify: 40 amps, Class RK5, time-delay, 600 VAC maximum, 300 VDC maximum, and non-indicating construction.

Key Features and Benefits

• 40-amp continuous rating for circuits and equipment designed around a 40A fuse.
• Time-delay performance allows the fuse to ride through temporary inrush currents that can occur during equipment startup.
• Dual-element design provides the operating characteristics expected from the FLSR family.
• Rated for applications up to 600VAC and 300VDC.
• Class RK5 fuse configuration for equipment requiring this specific fuse class.
• Industrial cartridge construction works with a properly rated fuse block, clip, or holder.
• Non-indicating design for applications where visual fuse indication isn’t required.
  

Technical Specifications

• Catalog Number: FLSR040
  
• Series: FLSR
  
• Continuous Current Rating: 40A
  
• Fuse Class: Class RK5
  
• Fuse Style: Dual Element
  
• Opening: Slo-Blo / Time Lag (T) / Time Delay
  
• Maximum AC Voltage: 600VAC
  
• Maximum DC Voltage: 300VDC
  
• AC Interrupt Amperage: 200,000A
  
• Additional AC Interrupt Amperage: 300,000A
  
• DC Interrupting Rating: 20,000A at 300VDC
  
• Construction: Industrial Cartridge
  
• Indicating: No
  
• Mounting: Fuse Block / Clip / Holder
  
• Holder Family: LFR60060 Series
  

Material Compliance and Certifications

The FLSR040 is a Class RK5 fuse. The product information provided for this catalog number does not specify individual RoHS, REACH, lead-free, halogen-free, or similar material-compliance declarations.

Where It Works Best

The FLSR040 makes sense in electrical systems where equipment can pull extra current for a short period during startup. Rather than reacting immediately to every temporary surge, its time-delay characteristic is designed to accommodate normal short-duration inrush while still providing overcurrent protection.