An electrical unit may include a current controller including an electrical regulator, a control circuit connected to a first input of the electrical regulator, a timer connected to a second input of the electrical regulator, and/or a turn-off circuit including a turn-off switch. The current controller may be configured to provide a first output signal in a first mode and a second output signal in a second mode. The current controller may be configured to transition from the first mode to the second mode based on a timer output of the timer. An electrical system may include an electrical unit and or a switch connected to the electrical unit. The switch may include a coil. The electrical unit may be configured to provide the first output signal to the coil in the first mode and provide the second output signal to the coil in the second mode.

An electrical unit may include a current controller including an electrical regulator, a control circuit connected to a first input of the electrical regulator, a timer connected to a second input of the electrical regulator, and/or a turn-off circuit including a turn-off switch. The current controller may be configured to provide a first output signal in a first mode and a second output signal in a second mode. The current controller may be configured to transition from the first mode to the second mode based on a timer output of the timer. An electrical system may include an electrical unit and or a switch connected to the electrical unit. The switch may include a coil. The electrical unit may be configured to provide the first output signal to the coil in the first mode and provide the second output signal to the coil in the second mode.

An electrical unit may include a current controller including an electrical regulator, a control circuit connected to a first input of the electrical regulator, a timer connected to a second input of the electrical regulator, and/or a turn-off circuit including a turn-off switch. The current controller may be configured to provide a first output signal in a first mode and a second output signal in a second mode. The current controller may be configured to transition from the first mode to the second mode based on a timer output of the timer. An electrical system may include an electrical unit and or a switch connected to the electrical unit. The switch may include a coil. The electrical unit may be configured to provide the first output signal to the coil in the first mode and provide the second output signal to the coil in the second mode.

An electrical unit may include a current controller including an electrical regulator, a control circuit connected to a first input of the electrical regulator, a timer connected to a second input of the electrical regulator, and/or a turn-off circuit including a turn-off switch. The current controller may be configured to provide a first output signal in a first mode and a second output signal in a second mode. The current controller may be configured to transition from the first mode to the second mode based on a timer output of the timer. An electrical system may include an electrical unit and or a switch connected to the electrical unit. The switch may include a coil. The electrical unit may be configured to provide the first output signal to the coil in the first mode and provide the second output signal to the coil in the second mode.

The invention discloses a short circuit current hierarchical control tripping parameter circuit breaker. According to the invention, resistance of an alloy magnetic resistance body is changed through circuit current, and contract control can be carried out on short-circuit current. The control range of the circuit breaker can achieve that no magnetic resistance will be generated when current is no more than 8 times of rated operational current, and current limiting may be realized by the magnetic resistance when current is 8 times more than rated value. In this way, hierarchical control on short-circuit current of different levels of circuits can be carried out, and short-circuit current can be limited in a predetermined range, thereby restricting the short-circuit current in a predetermined range, solving a problem of power supply flickering, and avoiding large-area power failure accidents caused by override trip existing in an electrical control switch.