Clamping voltage and pulse handling
The P6KE62CA-B: Its 53 V reverse standoff voltage means the line it protects can run at up to 53 V DC without the diode conducting leakage current; above that, breakdown occurs at 58.9 V minimum, and the clamp limits the transient to 85 V maximum at the rated 7.1 A peak pulse current. The 85 V clamp is the voltage the downstream circuitry must survive for the duration of the surge. For a 48 V telecom or industrial bus, this provides a comfortable margin above the nominal rail, but a 60 V-rated capacitor on the line would be stressed beyond its rating during the pulse.
Package and thermal envelope
Housed in a DO-204AC (DO-15) axial-lead package, the P6KE62CA-B mounts through-hole and is supplied in bulk. The axial leads carry the pulse current to the PCB traces; the lead diameter and copper pad area on the board set the thermal impedance for repetitive surges. For a single-shot event the 600 W rating is the limit, but for recurring transients the average power dissipation must stay within the package's thermal budget.