Abstract: A differential electrical protection device D including N?1 phase conductors, each phase conductor including, between an input, or upper, connection land and an output, or lower, connection land, a portion able to pass through a torus and a portion able to pass through a current measurement and supply sensor, the input connection lands being situated in a first plane P1, and the output connection lands extending in a second plane P2, in that the supply and measurement sensors of the N?1 phase conductors are each positioned in the space situated between the two planes P1,P2, and wherein it includes an additional phase conductor including an input connection land and an output connection land, a portion able to pass through the torus and a portion able to pass through an additional measurement sensor only measuring the current, this additional measurement sensor being of small size and being positioned directly above the torus in such a way that the assembly formed by the torus and the additional sensor is situ

Abstract: A differential electrical protection device D including N-1 phase conductors, each phase conductor including, between an input, or upper, connection land and an output, or lower, connection land, a portion able to pass through a torus and a portion able to pass through a current measurement and supply sensor, the input connection lands being situated in a first plane P1, and the output connection lands extending in a second plane P2, in that the supply and measurement sensors of the N?1 phase conductors are each positioned in the space situated between the two planes P1,P2, and wherein it includes an additional phase conductor including an input connection land and an output connection land, a portion able to pass through the torus and a portion able to pass through an additional measurement sensor only measuring the current, this additional measurement sensor being of small size and being positioned directly above the torus in such a way that the assembly formed by the torus and the additional sensor is situ

Abstract: A circuit breaker includes a main body case, an operating handle having a base portion and a knob portion protruding outwardly through a handle window frame opened in a cover of the main body case; a first shutter arranged between the base portion of the operating handle and the handle window frame, and disposed on the base portion, the first shutter being formed with a loose-fit hole to loosely fit the knob portion therethrough; and a second shutter disposed on the first shutter to move along with the knob portion. At ON and OFF positions of the operating handle, the first shutter extends beyond a front/rear edge of the handle window frame in a front-back direction to close the handle window frame, and the second shutter extends beyond a front/rear edge of the loose-fit hole in the front-back direction to close the loose-fit hole.

Abstract: A current detecting device includes an exciting coil (3) wound around a magnetic core (2) enclosing a conductor through which flows a measurement current, and an oscillator circuit (4) that generates a square wave voltage which is supplied to the exciting coil (3). Furthermore, the current detecting device includes a duty detector circuit (5) that detects the measurement current based on variation in the duty ratio of the square wave voltage output from the oscillator circuit (4), a frequency detector circuit (7) that detects an overcurrent of the measurement current based on the frequency of the square wave voltage output from the oscillator circuit (4), and an oscillation amplitude detector circuit (6) that detects an overcurrent of the measurement current based on the magnitude of the square wave voltage output from the oscillator circuit (4).

Abstract: A circuit breaker includes a main body case, an operating handle having a base portion and a knob portion protruding outwardly through a handle window frame opened in a cover of the main body case; a first shutter arranged between the base portion of the operating handle and the handle window frame, and disposed on the base portion, the first shutter being formed with a loose-fit hole to loosely fit the knob portion therethrough; and a second shutter disposed on the first shutter to move along with the knob portion. At ON and OFF positions of the operating handle, the first shutter extends beyond a front/rear edge of the handle window frame in a front-back direction to close the handle window frame, and the second shutter extends beyond a front/rear edge of the loose-fit hole in the front-back direction to close the loose-fit hole.

Abstract: A current detecting device includes an exciting coil (3) wound around a magnetic core (2) enclosing a conductor through which flows a measurement current, and an oscillator circuit (4) that generates a square wave voltage which is supplied to the exciting coil (3). Furthermore, the current detecting device includes a duty detector circuit (5) that detects the measurement current based on variation in the duty ratio of the square wave voltage output from the oscillator circuit (4), a frequency detector circuit (7) that detects an overcurrent of the measurement current based on the frequency of the square wave voltage output from the oscillator circuit (4), and an oscillation amplitude detector circuit (6) that detects an overcurrent of the measurement current based on the magnitude of the square wave voltage output from the oscillator circuit (4).