1500 W peak pulse, 512 V standoff — the rail clamp for high-voltage DC buses
The 1.5KE600A: In a 380 VDC bus or a 480 VAC rectified rail, the standoff voltage sits comfortably above the steady-state level, so the diode stays out of conduction until a surge pushes the line past its 570 V breakdown threshold. That 828 V ceiling protects downstream semiconductors rated for 1000 V or less — a MOSFET with a 900 V Vds, for example, stays inside its safe operating area.
DO-201 axial package — board-mount and thermal path
The junction rating is continuous; the device can sit at 175 °C idle as long as the average power stays within the derating curve.