A complex type fusible link which includes an insulative block base including a plurality of cavities; a conductive connecting plate which is integrally embedded in the insulative block base, a part of the conductive connecting plate being exposed to at least one of the cavities; a plurality of fusible elements each of which is accommodated in corresponding one of the cavities and includes a first end which is connected to the part of the conductive connecting plate and a second end; and a plurality of terminals each of which is integrally embedded in the insulative block base and includes a first end which is connected to the second end of corresponding one of the fusible elements and a second end which is exposed from the insulative block base, at least one of the fusible elements includes a fastening portion to which another fusible element is fastened.

An improved electric circuit structure for short circuit protection is applicable to examining a device under test, comprising a circuit breaking element, a thermistor, a filtering and rectifying module and a capacitor. A first end of the circuit breaking element is connected to a power source. The filtering and rectifying module is connected to a second end of the circuit breaking element, a ground, a first end of the thermistor and a first end of the capacitor. A second end of the capacitor is connected to a second end of the thermistor. The capacitor is connected in parallel with the device under test. The circuit breaking element disclosed in the present invention is a ceramic tube fuse and forms an open circuit when the device under test forms a short circuit. Meanwhile, the ceramic tube fuse withstands voltage between its first and second end without generating any physical damage.

An improved electric circuit structure for short circuit protection is applicable to examining a device under test, comprising a circuit breaking element, a thermistor, a filtering and rectifying module and a capacitor. A first end of the circuit breaking element is connected to a power source. The filtering and rectifying module is connected to a second end of the circuit breaking element, a ground, a first end of the thermistor and a first end of the capacitor. A second end of the capacitor is connected to a second end of the thermistor. The capacitor is connected in parallel with the device under test. The circuit breaking element disclosed in the present invention is a ceramic tube fuse and forms an open circuit when the device under test forms a short circuit. Meanwhile, the ceramic tube fuse withstands voltage between its first and second end without generating any physical damage.

A fusible link unit includes a locking member having a first locked portion, a second locked portion, and a pair of first abutted portions; a connection section; a first body having a first locking part and a pair of first abutting parts, the first body being extended from the first boundary in a predetermined direction, and the first boundary being a boundary extending in a direction that intersects a deployed direction of the first abutting parts; and a second body having a second locking part and a pair of second abutting parts, and extending in the same direction as the first body from the second boundary, the second boundary being a boundary extending in a direction that intersects a deployed direction of the second abutting part.

An improved electric circuit structure for short circuit protection is applicable to examining a device under test, comprising a circuit breaking element, a thermistor, a filtering and rectifying module and a capacitor. A first end of the circuit breaking element is connected to a power source. The filtering and rectifying module is connected to a second end of the circuit breaking element, a ground, a first end of the thermistor and a first end of the capacitor. A second end of the capacitor is connected to a second end of the thermistor. The capacitor is connected in parallel with the device under test. The circuit breaking element disclosed in the present invention is a ceramic tube fuse and forms an open circuit when the device under test forms a short circuit. Meanwhile, the ceramic tube fuse withstands voltage between its first and second end without generating any physical damage.

An improved electric circuit structure for short circuit protection is applicable to examining a device under test, comprising a circuit breaking element, a thermistor, a filtering and rectifying module and a capacitor. A first end of the circuit breaking element is connected to a power source. The filtering and rectifying module is connected to a second end of the circuit breaking element, a ground, a first end of the thermistor and a first end of the capacitor. A second end of the capacitor is connected to a second end of the thermistor. The capacitor is connected in parallel with the device under test. The circuit breaking element disclosed in the present invention is a ceramic tube fuse and forms an open circuit when the device under test forms a short circuit. Meanwhile, the ceramic tube fuse withstands voltage between its first and second end without generating any physical damage.

An easy-to-assemble fuse has a fusible body, a socket, and a cover. The fusible body is engaged with the socket. The cover is covered on the socket and the fusible body and is engaged with the socket. By the engagement between the fusible body and the socket and the engagement between the socket and the cover, the fuse achieves the purpose of fast alignment and positioning. The fuse can be quickly assembled during the manufacturing process, thereby simplifying the manufacturing process, and reducing the production cost.

An easy-to-assemble fuse has a fusible body, a socket, and a cover. The fusible body is engaged with the socket. The cover is covered on the socket and the fusible body and is engaged with the socket. By the engagement between the fusible body and the socket and the engagement between the socket and the cover, the fuse achieves the purpose of fast alignment and positioning. The fuse can be quickly assembled during the manufacturing process, thereby simplifying the manufacturing process, and reducing the production cost.

A surge arrester includes a polymer body or housing and a varistor assembly in the body or housing. The varistor assembly includes a plurality of varistor elements and a fuse electrically connected in series and forming a vertical stack of the plurality of varistor elements and the fuse. The stack has a first end surface, a second end surface, and a side surface extending between the first end surface and the second end surface. The varistor assembly includes a first end fitting at the first end surface of the stack and a second end fitting at the second end surface of the stack.

A surge arrester includes a polymer body or housing and a varistor assembly in the body or housing. The varistor assembly includes a plurality of varistor elements and a fuse electrically connected in series and forming a vertical stack of the plurality of varistor elements and the fuse. The stack has a first end surface, a second end surface, and a side surface extending between the first end surface and the second end surface. The varistor assembly includes a first end fitting at the first end surface of the stack and a second end fitting at the second end surface of the stack.