Mersen specifies AJT300EI as a 300A device in the AJT Series. Its rating set pairs 600V AC / 500V DC operation with 200kA AC / 100kA DC interrupting performance. This makes it suitable where high current limitation with time-delay performance for motor and transformer inrush. This catalog code identifies the EI visual/open-fuse indication configuration.
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For applications specifying Class J, Mersen AJT300EI supplies the 300A rating in the AJT Series. Mersen publishes 600V AC / 500V DC for this rating, together with 200kA AC / 100kA DC interrupting capability. The protection profile emphasizes high current limitation with time-delay performance for motor and transformer inrush. The Class J format uses ferrule / blade (amp-dependent) terminals with cartridge/clip mounting. Typical selection contexts include Motor Circuits, Mains, Feeders. This SKU is the EI visual/open-fuse indication configuration. Use the official Mersen datasheet to confirm final coordination and dimensions.
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