A4BY1000 is the 1000A selection in 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.
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Mersen A4BY1000 is a 1000A Class L fuse from the A4BY Series. 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 Mains, Feeders, Circuit Breakers. Use the official Mersen datasheet to confirm final coordination and dimensions.
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