Plug-in module of surge protector

Abstract

The invention discloses a plug-in module of a surge protector, comprising an upper cover, a lower cover, a state coupling rod, an overvoltage protecting and connecting component and a state indicator, wherein the upper cover and the lower cover are combined to form a shell of the plug-in module of the surge protector, the lower cover comprises a central mould frame and a side mould frame, an open hole is formed at the bottom of the side mould frame; the state coupling rod is arranged in the side mould frame of the lower cover and provided with a push rod, the push rod is penetrated through the open hole and extended out of the lower cover, and the push rod comprises a communication antenna; an energy storing spring is arranged in the side mould frame and connected with the state coupling rod for pushing the state coupling rod to move during malfunction; the overvoltage protecting and connecting component is arranged in the central mould frame of the lower cover; and the state indicator is positioned at the top of the lower cover and covered by the upper cover.

Description

Technical field [0001] The invention relates to the field of overvoltage protection of low-voltage power distribution systems, and more specifically, to a plug-in module of a surge protector. Background technique [0002] Surge protectors mostly adopt modular, plug-in and track-mounted terminal electrical structures, and terminal electrical appliances generally appear in the form of multiples of 9mm in size. Voltage-limiting surge protectors have thermal protection functions. Due to the structural limitations of their thermal release devices, unipolar products use an 18mm wide shape structure. In a three-phase system, the product shape is 72mm wide, which is limited by installation space. Sites such as terminal distribution boxes are very disadvantageous. In addition, the thermal release device of the existing voltage-limiting surge protector adopts a soft connecting wire. After multiple surges, the softness of the wire becomes worse, which affects the performance of the thermal...

AI Technical Summary

Problems solved by technology

All voltage-limiting surge protectors have thermal protection function. Due to the structural limitation of the thermal detachment device, the unipolar product adopts an outline structure with a width of 18mm. In the three-phase system, the appearance of the product is 72mm wide, which is limited by the installation space. The site, such as the terminal distribution box is very unfavorable

In addition, the thermal detachment device of the existing voltage-limiting surge protector adopts a soft connection wire. After multiple surges, the softness of the wire becomes worse, which affects the performance of the thermal tripping function; also due to the surge current change rate (di / dt) is very high, and the additional residual voltage acting on the soft connection wire will affect the overall protection performance of the product. For example, the additional residual voltage generated by a 20mm wire at a nominal discharge current of 20kA (8 / 20μs) up to 100V

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