Transient volt.suppressor,170W,Vcl.-40V,Ippc-80AVbreak-28-32V,for 12V automotive,TO-3 This series of Sensonetics' Transient Voltage Suppressors is specifically designed to protect automotive electrical systems against load-dump transients, while maintaining a predetermined clamping voltage. When the battery is removed from the charging unit, the low impedance alternator produces large, positive load-dump transients. Simultaneously, negative field-decay transients are generated by the collapsing field. If not absorbed and diverted to ground, these transients would propagate through the vehicle's electrical system, often with catastrophic results on integrated circuits, semiconductors, and other voltage-sensitive components. Sensonetics' Types PRZ60T040 through PRZ100T040 are designed for use in 12-volt electrical systems. For other voltages, consult the factory.