A method for controlled switching of a circuit breaker is described. The method includes initiating operation of the circuit breaker at an initiation time derivable from an initiation time function by calculating a value of the initiation time function with respect to a command instant. The initiation time function is a sum of the command instant and a command delay time. The initiation time function depends on a first parameter and a second parameter. At least one of: the partial derivative of the initiation time function with respect to the first parameter is dependent on the second parameter or the partial derivative of the initiation time function with respect to the second parameter is dependent on the first parameter. Further, a system for controlled switching according to the method and a circuit breaker including the system are described.

An electrical switch including a neutral contact adjustment system adapted for adjusting a position of a neutral contact opening surface relative to at least one phase contact opening surface such that the neutral contact adjustment system has a first operating state which is adapted to provide a simultaneous break operation in which a movable neutral contact disconnects simultaneously with at least one movable phase contact during an opening event, and a second operating state which is adapted to provide a late-break operation in which the movable neutral contact disconnects later than the at least one movable phase contact during the opening event.

A fusible switch disconnect device includes a housing adapted to receive at least one fuse therein, and a switchable contact for connecting the fuse to circuitry. A tripping mechanism and control circuitry are provided to move the switchable contact to an open position in response to a predetermined electrical condition.

A fusible switch disconnect device includes a housing adapted to receive at least one fuse therein, and a switchable contact for connecting the fuse to circuitry. A tripping mechanism and control circuitry are provided to move the switchable contact to an open position in response to a predetermined electrical condition.

A fusible switch disconnect device includes a housing adapted to receive at least one fuse therein, and a switchable contact for connecting the fuse to circuitry. A tripping mechanism including an electromagnetic coil is operable to move the switchable contact to an open position in response to a predetermined electrical condition when the fuse is engaged and when the switchable contact is in the closed position.

A fusible switch disconnect device includes a housing adapted to receive at least one fuse therein, and a switchable contact for connecting the fuse to circuitry. A tripping mechanism including an electromagnetic coil is operable to move the switchable contact to an open position in response to a predetermined electrical condition when the fuse is engaged and when the switchable contact is in the closed position.

An electrical switch including a neutral contact adjustment system adapted for adjusting a position of a neutral contact opening surface relative to at least one phase contact opening surface such that the neutral contact adjustment system has a first operating state which is adapted to provide a simultaneous break operation in which a movable neutral contact disconnects simultaneously with at least one movable phase contact during an opening event, and a second operating state which is adapted to provide a late-break operation in which the movable neutral contact disconnects later than the at least one movable phase contact during the opening event.

A fusible switch disconnect device includes a housing adapted to receive at least one fuse therein, and a switchable contact for connecting the fuse to circuitry. A tripping mechanism and control circuitry are provided to move the switchable contact to an open position in response to a predetermined electrical condition.

A fusible switch disconnect device includes a housing adapted to receive at least one fuse therein, and a switchable contact for connecting the fuse to circuitry. A tripping mechanism and control circuitry are provided to move the switchable contact to an open position in response to a predetermined electrical condition.

The invention relates to monitoring operation of a switching device in a power system, where a load is connected to a power source through the switching device. The load has windings, with coupling between at least one of two or more phases of a winding, and two or more windings of the load. The method includes obtaining measurements of at least one of voltages and currents, at one or more of a source and load side. Further, the method determines an electrical parameter associated with electrical switching of one or more poles. The parameter for each pole is determined based on at least one of voltage measurements at the source and load side, and line measurements associated with at least one winding. The values of the electrical parameter are monitored to determine the switching instant of the pole, for determining mechanical operating time deviation for estimating future switching instants.