The present disclosure provides a coil driving device comprising: an input voltage sensing unit for sensing an input voltage; a switch unit configured to make a switching operation to supply a driving current to a coil; a PWM circuit unit for outputting a pulse width modulation (PWM) signal for the switching operation of the switch unit; an impedance adjustment unit for varying an impedance value such that the PWM signal is adjusted, thereby limiting the driving current; and a control unit for causing the impedance adjustment unit to vary the impedance value on the basis of the input voltage, thereby adjusting at least one of the duty ratio of the PWM signal and the frequency thereof.

The present disclosure provides a coil driving device comprising: an input voltage sensing unit for sensing an input voltage; a switch unit configured to make a switching operation to supply a driving current to a coil; a PWM circuit unit for outputting a pulse width modulation (PWM) signal for the switching operation of the switch unit; an impedance adjustment unit for varying an impedance value such that the PWM signal is adjusted, thereby limiting the driving current; and a control unit for causing the impedance adjustment unit to vary the impedance value on the basis of the input voltage, thereby adjusting at least one of the duty ratio of the PWM signal and the frequency thereof.

A switching device including at least one main breaker, an actuator configured to cause a change of state of the main breaker, from a first to a second state, counter to a spring generated force, the actuator being powered by a control signal equal to a first level to cause the change of state of the main breaker then to a second, lower level, to hold the main breaker in the second state. The switching device comprises a current sensor configured to control the control signal to increase it to a third level higher than the second level if the current flowing in the main breaker is higher than or equal to a given operating threshold, to avoid a spurious change of state of the main breaker. The switching device comprises a re-armable protection system for controlling the time for which the control signal is held at the third level.

An electrical switching system of a circuit breaker, with a first busbar extending in a longitudinal direction, which carries a first contact and a second contact spaced apart therefrom in the longitudinal direction, and which has a first power connection, and with a second busbar extending in the longitudinal direction, which carries a first counterpart contact and a second counterpart contact spaced apart therefrom in the longitudinal direction, and which has a second power connection. The second busbar is mounted so as to be movable in a transverse direction perpendicular to the longitudinal direction, wherein the first busbar partially overlaps the second busbar along the longitudinal direction. In the longitudinal direction, the contacts and the counterpart contacts are arranged between the two power connections in the overlap region.

A DC relay having a function of extinguishing arc and resisting short-circuit current includes two stationary contact leading-out terminals, a straight sheet type movable spring, a push rod component, and four permanent magnets respectively arranged on the two sides in the width direction of the movable spring, and magnetic poles on a side facing to the movable and stationary contacts are opposite, and the two permanent magnets corresponding to a same side have opposite magnetic poles. A yoke clip is connected between the two permanent magnets. Upper and lower magnetizers arranged in a width direction at the position, and can approach one to another or come into contact with each other through the through hole provided in the movable spring; and at least two independent magnetically conductive loops are formed in the width direction of the movable spring by the upper magnetizers and the lower magnetizers.

A DC relay having a function of extinguishing arc and resisting short-circuit current includes two stationary contact leading-out terminals, a straight sheet type movable spring, a push rod component, and four permanent magnets respectively arranged on the two sides in the width direction of the movable spring, and magnetic poles on a side facing to the movable and stationary contacts are opposite, and the two permanent magnets corresponding to a same side have opposite magnetic poles. A yoke clip is connected between the two permanent magnets. Upper and lower magnetizers arranged in a width direction at the position, and can approach one to another or come into contact with each other through the through hole provided in the movable spring; and at least two independent magnetically conductive loops are formed in the width direction of the movable spring by the upper magnetizers and the lower magnetizers.

A DC relay capable of extinguishing arc and resisting short-circuit current includes two stationary contact leading-out terminals, a push rod component, a straight sheet type movable spring mounted on the push rod component and two permanent magnets. Two permanent magnets are respectively arranged on two sides in the width direction of the movable spring. two permanent magnets have same magnetic poles on a side facing to the movable and stationary contacts; and a yoke clip is connected between the two permanent magnets. Upper magnetizers are mounted above the position. The lower magnetizers are mounted under the position. The upper and lower magnetizers can approach or come into contact with each other through the through holes in the movable spring. At least two independent magnetically conductive loops are formed in the width direction of the movable spring by the upper and lower magnetizers.

A DC relay capable of extinguishing arc and resisting short-circuit current includes two stationary contact leading-out terminals, a push rod component, a straight sheet type movable spring mounted on the push rod component and two permanent magnets. Two permanent magnets are respectively arranged on two sides in the width direction of the movable spring. two permanent magnets have same magnetic poles on a side facing to the movable and stationary contacts; and a yoke clip is connected between the two permanent magnets. Upper magnetizers are mounted above the position. The lower magnetizers are mounted under the position. The upper and lower magnetizers can approach or come into contact with each other through the through holes in the movable spring. At least two independent magnetically conductive loops are formed in the width direction of the movable spring by the upper and lower magnetizers.

A DC relay having a function of extinguishing arc and resisting short-circuit current includes two stationary contact leading-out terminals, a push rod component, a straight sheet type movable spring mounted on the push rod component and two permanent magnets. Two permanent magnets are respectively arranged on two sides in the width direction of the movable spring. Two permanent magnets have opposite magnetic poles on sides facing to the movable and stationary, and have same magnetic poles on the same side in the width of the movable springs. A yoke clip is connected between two permanent magnets. Upper and lower magnetizers are respectively mounted above and under the position, and can approach or come into contact with each other through the through holes in the movable spring. At least two independent magnetically conductive loops are formed in the width direction of the movable spring by the upper and lower magnetizers.

A DC relay having a function of extinguishing arc and resisting short-circuit current includes two stationary contact leading-out terminals, a push rod component, a straight sheet type movable spring mounted on the push rod component and two permanent magnets. Two permanent magnets are respectively arranged on two sides in the width direction of the movable spring. Two permanent magnets have opposite magnetic poles on sides facing to the movable and stationary, and have same magnetic poles on the same side in the width of the movable springs. A yoke clip is connected between two permanent magnets. Upper and lower magnetizers are respectively mounted above and under the position, and can approach or come into contact with each other through the through holes in the movable spring. At least two independent magnetically conductive loops are formed in the width direction of the movable spring by the upper and lower magnetizers.