Patent ID: 7768761
Filing Date: 2010-08-03
Classification: H02H

Abstract:
1. An electrical surge protection apparatus including: one or more current paths each between corresponding one or more input nodes and one or more output nodes, each current path including a corresponding transistorised surge protection device configured to assume an isolating state in response to an over-current therethrough; a voltage-triggered protective circuit configured to assume a low impedance in response to an overvoltage thereacross coupling points on the current paths between the transistorised surge protection devices and the output nodes to one or more surge sinking nodes; wherein, upon said voltage-triggered circuit assuming the low-impedance a surge current is passed through one or more of the transistorised surge protection devices to said surge sinking nodes in response to which surge current said transistorised surge protection devices assume the high impedance configuration thereby isolating corresponding output nodes from corresponding input nodes.