A4BY300 is the 300A selection in Mersen’s A4BY Series. The electrical profile is 600V AC / 300V DC, with 200kA AC / 100kA DC published interrupting performance. Its selection value is strongest where the circuit needs 4-second minimum time delay at 500% rating for service and feeder protection.
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Mersen A4BY300 is a 300A Class L fuse from the A4BY Series. The published rating combines 600V AC / 300V DC operation and 200kA AC / 100kA DC short-circuit capability. The design focuses on 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. Check the official Mersen datasheet before final equipment coordination.
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