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...

read more >
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...

read more >
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....

read more >
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...

read more >
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....

read more >
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...

read more >
Business Partner
News Information
Anti-Reverse Power Flow Lockout Logic for High-Voltage Auxiliary Switches at Grid Connection Points of PV Inverters

With the rapid development of renewable energy, photovoltaic power generation systems have gained widespread adoption globally. However, ensuring the safety and stability of power transmission during PV system operation remains critical. This paper delves into the anti-reverse power flow lockout logic for high-voltage auxiliary switches at grid connection points of PV inverters, analyzing its significance and implementation methods in practical applications.

read more >
Specialized Micro Switch Selection Guide Compliant with IEC Standards

In today's highly automated industrial environments, selecting a reliable and efficient microswitch is crucial for ensuring stable equipment operation. Especially in applications requiring strict adherence to International Electrotechnical Commission (IEC) standards, a dedicated microswitch compliant with IEC standards becomes indispensable. This document provides a comprehensive “Selection Guide for Dedicated Microswitches Compliant with IEC Standards,” helping you precisely identify the most suitable product for your needs from a wide range of options.

read more >
Salt Spray Test Standard for Anti-Corrosion Coatings on High-Voltage Auxiliary Switches of Offshore Wind Platforms: The “Invisible Armor” Safeguarding Marine Energy Security

Against the backdrop of the global energy transition, offshore wind power—a vital component of clean energy—is advancing at an unprecedented pace. However, the unique characteristics of the marine environment—high humidity, intense salt spray, and severe corrosion—pose significant challenges to the core components of wind power equipment. Among these, the high-voltage auxiliary switch, serving as the “nerve center” of offshore wind platforms, directly impacts the stable operation of the entire system through its reliability. Anti-corrosion coatings act as the “first line of defense” protecting this critical equipment. Today, we focus on the salt spray test standards for anti-corrosion coatings on high-voltage auxiliary switches in offshore wind platforms. We explore how scientific testing ensures coating performance meets requirements, safeguarding marine energy security.

read more >