An integrated electro-static discharge (ESD) device has a set of metal layers. Each metal layer in the set has one or more first-terminal metal features interleaved with one or more second-terminal metal features in a lateral direction, and at least one first-terminal metal feature in a metal layer of the set overlaps in a normal direction at least one second-terminal metal feature in an adjacent metal layer of the set. By overlapping metal features in the normal direction, capacitance can be added to the ESD device, which improves its operating characteristics, without increasing the layout size of the ESD device.

A surge suppression device has a resistive element, a capacitor electrically connected to the resistive element, a terminal electrically connected to the opposite side of the resistive element to the side connected to the capacitor, a fixing metal bracket to be fixed to a fixing target, and a mold resin to mold the resistive element, the terminal and the fixing metal bracket. The capacitor is located away from the mold resin.

An overvoltage protection circuit which can be applied to a motor controller is provided. The overvoltage protection circuit is coupled to an input terminal for receiving an input voltage. The overvoltage protection circuit comprises a switch circuit, a controller, and a comparing unit. When the input voltage is greater than a first voltage, a discharging mechanism is forced to start so as to suppress a voltage spike. When the input voltage is less than a second voltage, the discharging mechanism is closed so as to operate normally.

An electronic device includes an input, an output, a metal fuse, a resistor, a heat control transistor, and a heat controller. The metal fuse is coupled between the input and the output. The resistor is coupled between the metal fuse and the heat control transistor. The heat control transistor is coupled between the resistor and a reference terminal of the electronic device, and the heat controller is configured to control a heater current of the heat control transistor.

An apparatus includes a surge protection device, a current sensor configured to sense a current through the surge protection device, and a surge discriminator circuit coupled to the current sensor and configured to discriminate among a plurality of surge levels for the surge protective device responsive to the sensed current. The current sensor may include a current transformer configured to generate a secondary current responsive to the sensed current and the surge discriminator circuit may be configured to discriminate among a plurality of surge levels responsive to the generated secondary current.

Power sourcing equipment for power over Ethernet (PoE) includes a power supply control circuit, an Ethernet port, and a surge protection circuit. The surge protection circuit includes a first circuit, a second circuit, and a common discharge circuit. The first circuit is connected to a power supply pin group of the Ethernet port, the power supply control circuit, and the common discharge circuit. The second circuit is connected to a non-power supply pin group of the Ethernet port and the common discharge circuit. The first circuit transmits, to the common discharge circuit, a first surge that is input from the power supply pin group. The second circuit transmits, to the common discharge circuit, a second surge that is input from the non-power supply pin group. The common discharge circuit discharges the first surge and the second surge to ground.

A circuit board with an electrostatic discharge protection mechanism and an electronic apparatus having the same are provided. The circuit board includes a substrate, at least one signal trace, and a conductive element. The at least one signal trace is disposed on the substrate. The conductive element is electrically connected to a ground plane of the substrate and crosses over the at least one signal trace. The conductive element has at least one discharging portion. The position of the at least one discharging portion corresponds to the at least one signal trace. A gap exists between the at least one discharging portion and the at least one signal trace. A static electricity of the at least one signal trace is discharged to the at least one discharging portion.

A circuit board with an electrostatic discharge protection mechanism and an electronic apparatus having the same are provided. The circuit board includes a substrate, at least one signal trace, and a conductive element. The at least one signal trace is disposed on the substrate. The conductive element is electrically connected to a ground plane of the substrate and crosses over the at least one signal trace. The conductive element has at least one discharging portion. The position of the at least one discharging portion corresponds to the at least one signal trace. A gap exists between the at least one discharging portion and the at least one signal trace. A static electricity of the at least one signal trace is discharged to the at least one discharging portion.

Bus mounted surge protection devices are provided that are configured to be positioned in a panelboard alongside one or more similarly sized circuit breaker devices. The bus mounted surge protection device is configured to be received by a same provisional bus as the one or more circuit breaker devices and the bus mounted surge protection device is configured to protect all of the one or more circuit breaker devices in the panelboard.

The submitted voltage limiter consists of the insulating shell (26), closed from the top by the electrically and thermally conductive first contact plate (2) provided with the first connecting point (1) and from the bottom by the electrically and thermally conductive second contact plate (10) provided with the second connecting point (9). The embodiment of the two triggering semiconductor elements (5, 13) oriented in opposing directions and the protection member (17) connected to it in parallel, located between the two inner plates (3, 11), is located inside the insulating shell (26). The semiconductor elements (5, 13) are simultaneously interconnected with the electronic control device and connecting points (1, 9). The limiter is equipped with compressive construction to provide clamping and electrical interconnection of individual parts. The first triggering semiconductor element (5) is located between the thermally and electrically conductive first inner plate (3), which is in contact with its cathode (7) and the first contact plate (2), which is in contact with its anode (6). The second triggering semiconductor element (13) is located between the thermally and electrically conductive second inner plate (11), which is in contact with its cathode (15) and the second contact plate (10), which is in contact with its anode (14). The electronic control device may be located outside or inside the insulating shell (26) and consists of the first control device (4) interconnected with the control electrode (8) of the first triggering semiconductor element (5), the first contact plate (2) and the first inner plate (3) and interconnected with the control electrode (16) of the second triggering semiconductor element (13), with the second contact plate (10) and the second inner plate (11) from the second control device (12).