FLSR350 - 350Amp Fuse

FLSR350 - 350Amp Fuse

The FLSR350 is a 350-amp Class RK5 time-delay fuse designed for electrical systems that require a higher current rating, delayed-opening characteristics, and knife-blade construction. Rated for applications up to 600V AC and 300V DC, this dual-element fuse uses a Slo-Blo / Time Lag (T) opening characteristic, allowing appropriate short-duration startup or inrush currents to occur without responding like a fast-acting fuse. That distinction matters when you're maintaining equipment where temporary increases in current are expected during normal operation. The FLSR350 is the non-indicating version, so it is particularly important to verify that detail when replacing an existing fuse.

Key Features and Benefits

• 350A continuous rating – Matches circuits and equipment specifically requiring a 350-amp fuse.
• Class RK5 configuration – Provides an important fuse-class specification for correct replacement and application matching.
• Time-delay opening – Slo-Blo / Time Lag (T) characteristics accommodate appropriate brief inrush or startup currents before opening under sustained overcurrent conditions.
• Dual-element construction – Combines dual-element construction with the fuse's specified time-delay behavior.
• Knife-blade style – Intended for installation in compatible fuse blocks, clips, or holders.
• Non-indicating configuration – Matches applications that specifically specify the standard non-indicating FLSR350.
  

Technical Specifications

• Catalog Number: FLSR350
  
• Series: FLSR
  
• Product Type: Dual-Element Time-Delay Fuse
  
• Fuse Class: Class RK5
  
• Continuous Current Rating: 350A
  
• Maximum AC Voltage: 600V AC
  
• Maximum DC Voltage: 300V DC
  
• Opening Characteristic: Slo-Blo / Time Lag (T) / Time Delay
  
• Family Style: Dual Element Fuse
  
• Construction / Size: Knife-Blade
  
• Indicating: No
  
• DC Interrupting Rating: 20,000A (20 kA) at 300V DC
  
• Manufacturer-Listed AC Interrupt Amperage: 200,000A and 300,000A at 600V AC*
  
• Mounting Method: Fuse Block / Clip / Holder
  
• PG Holder: LFR60400 Series
  

Material Compliance and Certifications

The supplied specifications identify the FLSR350 as a Class RK5 fuse. However, catalog-specific UL, CSA, RoHS, or other certification and material-compliance declarations were not included in the information provided, so those details should not be assumed.

Where It Works Best

The FLSR350 is best suited to electrical equipment specifically engineered for a 350A Class RK5 time-delay fuse with knife-blade construction. Its delayed opening characteristic makes it appropriate for correctly specified circuits that can experience acceptable, temporary increases in current during startup or normal operation. Those short-duration events are treated differently from sustained overcurrent conditions, which is one reason why matching the required fuse type matters.