Mersen specifies A4BY400 as a 400A device in the 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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For applications specifying Class L, Mersen A4BY400 supplies the 400A rating in 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 Feeders, Circuit Breakers, Load Centers. Check the official Mersen datasheet before final equipment coordination.
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