The BZW50-27B ,from STMicroelectronics, is a 5000W (5kW) Zener diodes, package in a R-6 and Through Hole package. It is designed for transient overvoltage protection, targeting General Purpose applicaition. The rate stand-off voltage for the BZW50-27B is 27V volts. The minimum breakdown voltage is given for 30V. It can support the clamping voltage and peak pulse current of up to 62V and 968A (8/20μs) , respectively.