Abstract: A self-test module of an electronic circuit breaker includes a power supply assembly with a rechargeable battery, a self-test enablement assembly, an induced power supply assembly, a boost power supply, and a micro control unit (MCU). The self-test enablement assembly is connected to the rechargeable battery and includes an enablement button, a capacitor and a first power chip connected in series. The induced power supply assembly includes a buck chip. The boost power supply includes a second power chip and a boost chip connected in series. The MCU includes a plurality of pins that are connected to the first and second power chips, the buck chip, and the boost chip. The self-test module has two working modes; the electronic circuit breaker may be provided with or without a load current. The MCU operates the self-test procedure, indicates the self-test status, and maintains the indication for a period of time.

Abstract: A self-test module of an electronic circuit breaker includes a power supply assembly with a rechargeable battery, a self-test enablement assembly, an induced power supply assembly, a boost power supply, and a micro control unit (MCU). The self-test enablement assembly is connected to the rechargeable battery and includes an enablement button, a capacitor and a first power chip connected in series. The induced power supply assembly includes a buck chip. The boost power supply includes a second power chip and a boost chip connected in series. The MCU includes a plurality of pins that are connected to the first and second power chips, the buck chip, and the boost chip. The self-test module has two working modes; the electronic circuit breaker may be provided with or without a load current. The MCU operates the self-test procedure, indicates the self-test status, and maintains the indication for a period of time.

Abstract: A current transformer supplying a power for an electronic controller comprises two independent core magnetic circuits, wherein a first core magnetic circuit is a closed loop formed by connecting a U-shaped core and a linear core, a primary conductor extends through the closed loop, and a secondary winding for power supply is wound on the linear core; a second core magnetic circuit having an opening shape is disposed in parallel to the linear core of the first core magnetic circuit, and the open end of the second core magnetic circuit is coupled to the first core magnetic circuit through air gaps. The area of the cross section of the linear core is less than that of the cross section of the U-shaped core, so that the linear core can be magnetically saturated earlier than the U-shaped core. The centerline length of the U-shaped core is 1.5 to 4 times of that of the linear core.

Abstract: A current transformer supplying a power for an electronic controller comprises two independent core magnetic circuits, wherein a first core magnetic circuit is a closed loop formed by connecting a U-shaped core and a linear core, a primary conductor extends through the closed loop, and a secondary winding for power supply is wound on the linear core; a second core magnetic circuit having an opening shape is disposed in parallel to the linear core of the first core magnetic circuit, and the open end of the second core magnetic circuit is coupled to the first core magnetic circuit through air gaps. The area of the cross section of the linear core is less than that of the cross section of the U-shaped core, so that the linear core can be magnetically saturated earlier than the U-shaped core. The centerline length of the U-shaped core is 1.5 to 4 times of that of the linear core.