About us

Shenyang Longdy Electrical Equipment Co., Ltd. was established in 2003, is specialized in auxiliary switch research and development, manufacturing, set stroke switch, micro switch research and development and manufacturing, precision mold design and manufacturing, precision stamping parts, plastic parts processing in one of the high-tech research and development, production enterprises.

PURPOSETo comply with truth · To work with morality
VISIONBuild excellent enterprises, build a hundred billion business circle, and help the northeast economy
MISSIONTo create a rich and happy life for employees, at the same time, to contribute to the development of customers and society.
SENSE OF WORTHActively love life and work, to be rigorous, honest, grateful, humble and altruistic.
Mold workshop

Mold division has advanced processing equipment and testing equipment. There are more than 100 sets of processing equipment, such as vertical machining center, CNC lathes, high-precision wire cutting, EDM, engraving machine, milling machine, grinding machine, high-speed punching machine, etc. There are more than 30 sets of testing equipment, such as coordinate measuring instrument X fluorescence coating thickness tester, salt spray testing machine, simple beam impact testing machine, 1T plastic tensile testing machine, etc., which can ensure the production and processing cycle and quality control of molds and products...

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Injection molding workshop

Shenyang Qingji Precision Molding Co., Ltd. is an independent business division of Longdy Electrical Appliances, established in 2010, specializing in the design and manufacturing of injection molds, die casting molds, rubber molds, injection products, die casting products, rubber products, mechanical processing, hardware products, stamping products production and sales. Plant construction area of 4500 square meters, more than 30 employees. Over the years, Qingji Molding has been focusing on the design, development and production of plastic mold sales, adhere to the purpose of quality, long-term for Volkswagen, Shenyang Broad, Switzerland ABB, Astak, Jinbo Johnson, South Korea Aige machinery and other well-known brand manufacturers to provide supporting molds and products...

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Assembly shop

The company has product independent research and development, design, production capabilities. Has developed, produced and assembled 27 series of auxiliary switches (FK series, FH series, FH1 series, FR series, FR1 series, FC series, FB series, FA series, S100 series, CWA series, C2 series, LXB series, LZ series, LAA series, LFZ series, LFD series, LFE series, LFF series and LFG series, etc.), more than 400 specifications. All electrical products are produced according to the national low-voltage electrical standard GB/T14048.5-2008 (equivalent to IEC60947-5-1), and have passed the type test of the National Machinery Industry low-voltage explosion-proof electrical products quality supervision and testing center or Shanghai Electrical Equipment Testing Institute....

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Electroplating workshop

Electroplating processing and manufacturing Department general description: the existing four production lines, respectively, alkaline galvanizing line, acid galvanizing line, rolling tin line, non-cyanide rolling silver line, 3 management personnel, 2 technical personnel, 27 production...

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Machine shop

The machine workshop has 4 bench drills, 4 CNC cars, 1 machine walking machine, 2 general cars, can process all kinds of machine parts, professional skills are strong, can process scattered parts and batch parts....

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Press shop

Our stamping workshop has 6 equipment, 80T one, 45T one, 25T three, 16T one, 6.3 tons one, can guarantee the quality and quantity of electronic connectors...

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Business Partner
News Information
High-Voltage Auxiliary Switch: The Secret Behind Precise Indication of Main Switch Status

In power systems, the high-voltage auxiliary switch plays a crucial role. Like a loyal sentinel, it constantly monitors the status of the main switch, ensuring the stable operation of the power system. So, how does the high-voltage auxiliary switch achieve accurate indication of the main switch status? What technical principles and design wisdom lie behind this? This article will take you on an in-depth exploration.

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Analysis of the Core Role of Micro Switches in Vacuum Circuit Breakers

Within the high-voltage equipment sector of power systems, vacuum circuit breakers serve as critical control and protection components, with their performance stability directly impacting grid operational safety. Within the internal structure of these precision devices, microswitches play an indispensable role. This article delves into the function of microswitches in vacuum circuit breakers, revealing how this miniature component ensures reliable circuit breaker operation through precise mechanical feedback mechanisms.

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Why is the high-voltage auxiliary switch considered the core component of a three-position operating mechanism?

In power systems, the three-position operating mechanism plays a crucial role, enabling flexible switching between three circuit states: energized, isolated, and grounded. Within the complex operation of this mechanism, the high-voltage auxiliary switch serves as its core component, performing an indispensable function. So why is the high-voltage auxiliary switch regarded as such a critical part? This article will explore this question in depth from multiple perspectives.

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