Abstract: A fast acting switching mechanism for a circuit breaker includes a drive rod articulated to a drive module and supporting at an end thereof a contact bridge having at opposite ends thereof respective moveable contacts for switchably engaging a pair of fixed contacts of the circuit breaker. A contact spring unit is operatively coupled to the drive module for applying closing pressure in the order of 200 Kg; and a latch latches the drive rod in an open or closed position after operation of the circuit breaker and prevents rebounds. The contact bridge includes a pair of side conductors supporting on upper edges thereof an armature having an exposed upper surface that supports the moveable contacts at opposite ends of the armature; and a reinforcing element inserted between the side conductors.

Abstract: A solid-state device for decreasing voltage in medium- and high-voltage circuit comprises energy-dissipating element in the form of a non-linear resistance, mainly a power varistor, a contact system switched in parallel with this element and comprising at least a pair of power contacts, a gate blocking unit on semiconductors, a control block for a gate blocking unit and power contacts. The varistor in chosen for voltage considerably lower than the voltage of electric circuit source, varistor capacity is a calculated for the time determined by operation conditions in this circuit, a pair (pairs) of power contacts and a gate blocking are chosen for operation with voltage drop which is formed at a varistor when load current is flowing through it.

Abstract: A fast acting switching mechanism for a circuit breaker includes a drive rod articulated to a drive module and supporting at an end thereof a contact bridge having at opposite ends thereof respective moveable contacts for switchably engaging a pair of fixed contacts of the circuit breaker. A contact spring unit is operatively coupled to the drive module for applying closing pressure in the order of 200 Kg; and a latch latches the drive rod in an open or closed position after operation of the circuit breaker and prevents rebounds. The contact bridge includes a pair of side conductors supporting on upper edges thereof an armature having an exposed upper surface that supports the moveable contacts at opposite ends of the armature; and a reinforcing element inserted between the side conductors.

Abstract: Contact arc-quenching system (CAQS) of power switchgear (PSG) for application in contactors, current non-limiting automatic switches, contactor-automatic switches (air, vacuum or filled with gas, e.g., SF6.