• All sections
• H - Electricity
• H02H - Emergency protective circuit arrangements
• H02H 3/30 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection responsive to difference between voltages or between currentsEmergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus using pilot wires or other signalling channel

Patent holdings for IPC class H02H 3/30

Total number of patents in this class: 78

10-year publication summary

Principal owners for this class