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The P6KE400A is a high-reliability unidirectional transient voltage suppressor for 400V DC power and signal lines. Rated at 600W peak pulse power (10/1000µs), it delivers fast clamping response and low incremental resistance to protect against lightning surges, inductive load switching, and power disturbances. The DO-204AC (DO-15) axial package provides robust surge handling capability for industrial power supplies, inverters, and control systems.