Mersen specifies A4BQ250 as a 250A device in the A4BQ Series. Its rating set pairs 600V AC / 500V DC operation with 200kA AC / 100kA DC interrupting performance. The series is intended for applications needing 4-second time delay at 500% rating and very high current limitation.
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For applications specifying Class L, Mersen A4BQ250 supplies the 250A rating in the A4BQ Series. Mersen publishes 600V AC / 500V DC for this rating, together with 200kA AC / 100kA DC interrupting capability. A key selection characteristic is 4-second time delay at 500% rating and very high current limitation. The Class L format uses blade terminals with cartridge/clip mounting. Typical selection contexts include Mains, Feeders, Large Motors. Check the official Mersen datasheet before final equipment coordination.
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