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Approvals & Standards

  • Mersen Self-Certification, UL Listed to Standard 248-10, File E2137
  • CSA Certified to Standard C22.2, No. 248.10 IEC 269-2-1
  • DC Tested to UL 248 limits (Mersen Self-Certified)

Key features & benefits

Amp-Trap A4BY fuses have been the industry's favorite when it comes to protecting service entrance equipment, feeder circuits, and circuit breakers. The A4BY is a 100percent rated device and may be applied at continuous currents up to its ampere rating. A 4-second minimum time delay at 500percent rating allows the A4BY to pass normal current surges and to coordinate with ground fault relays.

More specifications


  • Mains
  • Feeders
  • Circuit Breakers
  • Load centers
  • Panelboards
  • Switchboards
  • Metering Centers

Product Specifications

Item Number


Item Description (ERP)

600V 1601A L TD FUSE  


Fuse Amp-Trap® 600V 1601A Time-Delay Class L A4BY Series  

EAN/UPC code


Rated voltage AC UL

600   V

Rated voltage DC UL

300   V

Rated current

1601   A

ROHS Compliant


Fuse class

Class L  


Time Delay  



AC Max I.R./Breaking Capacity: I1

200   kA

Contact materials

Silver-Plated Copper  

Connection/Terminal Type


Body/Insulating Material


Product Weight

3.9689   kg

Product Diameter

88.9   mm

Product Length

273   mm

Sell Pack Quantity

1   Each

Sell Pack Weight

4.1685   kg

Sell Pack Width

95.2   mm

Sell Pack Length

304.8   mm

Sell Pack Height

96.8   mm