Mersen

Mersen A4BY1200 1200A 600V Class L Time-Delay Fuse

Name: Mersen A4BY1200 1200A 600V Class L Time-Delay Fuse
Brand: Mersen
SKU: A4BY1200

Part Number: A4BY1200

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For 1200A circuit protection, A4BY1200 is a catalog member of Mersen’s A4BY Series. Core electrical data includes 600V AC / 300V DC operation and 200kA AC / 100kA DC interruption. The series is intended for applications needing 4-second minimum time delay at 500% rating for service and feeder protection.

Rated Current1200A

Rated Voltage600V AC / 300V DC

Breaking Capacity200kA AC / 100kA DC

PackageClass L

Tags

A4BY Series A4BY1200 class l Mersen time-delay

Part A4BY1200 belongs to the Mersen A4BY Series and is rated 1200A. The circuit rating is 600V AC / 300V DC; published interrupting performance is 200kA AC / 100kA DC. Its circuit-protection behavior is defined by 4-second minimum time delay at 500% rating for service and feeder protection. The Class L format uses blade terminals with cartridge/clip mounting. Typical selection contexts include Feeders, Circuit Breakers, Load Centers. Use the official Mersen datasheet to confirm final coordination and dimensions.

Technical Specifications

Part Number: A4BY1200
Manufacturer Part Number: A4BY1200
Series: A4BY Series
Fuse Type: Current-Limiting Time-Delay Class L Fuse
Current Rating: 1200A
Voltage Rating: 600V AC / 300V DC
AC / DC: AC/DC
Breaking Capacity: 200kA AC / 100kA DC
Package / Dimensions: Class L
Mounting: Cartridge / Clip
Application: Circuit Breaker Protection · Feeder circuits · Panelboards · Residential load centers · Switchboard Mains
Standard: CSA C22.2 No. 248.10 · UL 248-10
Terminal Type: Blade
Fuse Speed: Time Delay
Utilization Class: Class L
Approvals: CSA · UL Listed
Certifications: UL Listed · CSA