LPN-RK-40SP - 40 Amp Fuse

LPN-RK-40SP - 40 Amp Fuse

Getting the right fuse means checking more than the amperage printed on the label. The Eaton Bussmann series LPN-RK-40SP is a 40A Class RK1 time-delay, current-limiting fuse rated for 250VAC and 125VDC. Eaton specifies an interrupting rating of 300 kAIC at 250VAC and 100 kAIC at 125VDC, along with dual-element construction and a ferrule-end-to-ferrule-end connection. The manufacturer also specifies a 10-second response time at 500% and lists high in-rush current motor protection among the model's special features. When correctly selected, installed by your qualified electrical personnel, and operated within its specified ratings, the LPN-RK-40SP is built to last as part of a properly designed and maintained electrical system.

Key Features and Benefits

• 40A Class RK1 configuration: Combines a 40-amp rating with Eaton's specified Class RK1 fuse design for compatible equipment.
• 250VAC / 125VDC ratings: Clearly defined AC and DC voltage ratings make it easier to match the fuse to the circuit requirements.
• Time-delay operation: Eaton identifies this model as a time-delay fuse, an important characteristic when matching protection to equipment operating requirements.
• Current-limiting design: The LPN-RK-40SP is specified as a current-limiting fuse.
• Dual-element construction: Uses the manufacturer's stated dual-element configuration.
• 10 seconds at 500%: Eaton lists this response-time specification for the LPN-RK-40SP.
• Ferrule-to-ferrule end connection: Provides a clear physical connection characteristic to verify against the existing fuse holder and equipment.

Technical Specifications

• Manufacturer: Eaton
  
• Product Family: Bussmann Series
  
• Product Name: Eaton Bussmann Series LPN-RK Fuse
  
• Catalog Number: LPN-RK-40SP
  
• Product Type: Fuse
  
• Fuse Class: Class RK1
  
• Amperage Rating: 40A
  
• AC Voltage Rating: 250VAC
  
• DC Voltage Rating: 125VDC
  
• AC Interrupting Rating: 300 kAIC at 250VAC
  
• DC Interrupting Rating: 100 kAIC at 125VDC
  
• Fuse Type: Time Delay; Current-Limiting
  
• Number of Elements: Dual
  
• Response Time: 10 sec at 500%, as specified by Eaton
  
• Connection: Ferrule End × Ferrule End
  
• Fuse Indicator: Non-Indicating, according to Eaton's dedicated Fuse Indicator field
  
• Special Feature: High In-Rush Current Motor Protection
  
• Product Length/Depth: 3 in.
  
• Product Height: 0.81 in.
  
• Product Width: 0.81 in.
  
• Product Weight: 0.5 lb.
  
• UPC: 051712538381
  
• CE Marked: Yes
  

Material Compliance and Certifications

According to Eaton's specifications, the Bussmann series LPN-RK-40SP is CE-marked. No additional material-compliance certification should be assumed beyond the information supplied by the manufacturer for this catalog number.

Where It Works Best

The Eaton Bussmann LPN-RK-40SP 40A Class RK1 fuse is intended for compatible electrical equipment requiring a 40A rating, 250VAC / 125VDC voltage ratings, time-delay operation, current-limiting characteristics, dual-element construction, and a ferrule-end × ferrule-end connection. Eaton's stated high in-rush current motor protection is another characteristic to consider when evaluating this fuse for compatible motor applications.