FLSR400-ID - 400 Amp Fuse

FLSR400-ID - 400 Amp Fuse

When you're replacing a high-amperage fuse, a small difference in specifications can mean you've got the wrong component. The FLSR400-ID is a 400A Class RK5 time-delay indicating fuse with a maximum rating of 600V AC and 300V DC. Its dual-element Slo-Blo / Time Lag (T) operation allows appropriate short-duration startup and inrush currents without unnecessary opening, within the fuse's specified time-current characteristics.

Key Features and Benefits

• 400A continuous rating – Matches electrical equipment specifically requiring a 400-amp Class RK5 fuse.
• Class RK5 fuse – Gives you a clearly defined fuse class for accurate replacement and equipment matching.
• Time-delay operation – Slo-Blo / Time Lag (T) characteristics accommodate appropriate temporary startup and inrush current.
• Indicating configuration – A useful distinction for maintenance personnel identifying fuse status and matching an indicating replacement.
• Dual-element construction – Supports the time-delay operating characteristics of the FLSR400-ID.
• Knife-blade construction – Made for compatible fuse blocks, clips, and holders.
  

Technical Specifications

• Catalog Number: FLSR400-ID
  
• Manufacturer Reference: FLSR400ID
  
• Series: FLSR_ID
  
• Product Type: Indicating Time-Delay Fuse
  
• Fuse Class: Class RK5
  
• Continuous Current Rating: 400A
  
• 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: Yes
  
• 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 manufacturer information identifies the FLSR400-ID as a Class RK5 fuse. Catalog-specific details for individual UL, CSA, RoHS, or other certification and material-compliance declarations were not included in the information provided, so those claims should not be assumed.

Where It Works Best

The FLSR400-ID 400A fuse makes sense in electrical systems specifically engineered around Class RK5 time-delay protection, particularly where normal operation can include brief startup or inrush current. Its dual-element Slo-Blo characteristics allow the fuse to tolerate appropriate temporary current increases according to its time-current characteristics while retaining its intended overcurrent-protection function.

The indicating feature is especially useful from a maintenance standpoint. When equipment specifications call for the indicating version, choosing the FLSR400-ID preserves that feature rather than substituting the otherwise similar non-indicating configuration. That's a detail that's easy to overlook when two fuses share the same basic amperage and voltage markings.