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About Us
We use international patents to ensure safe power and support a green future.

Longmen Technical Services Co., Ltd.

"Leading global current-cutoff technology, safeguarding nuclear power safety"

Our "High and Ultra-High Voltage Cutoff System – POCT" offers the safest solution to prevent nuclear power incidents. Developed by an inventor with over 50 years of O&M experience, it holds invention patents in 10 countries (Taiwan, South Korea, Germany, USA, UK, Russia, France, Japan, India, China), ensuring reliable power protection worldwide.

  • Self-protection function compatible with smart circuit breakers.
  • Mechanical auto cut-off, stable and easy to maintain.
  • 9.3-grade impact resistance, IEEE 344 certified.
  • Power cut-off speed <1Hz, rapid response.
  • The ultimate protection for power systems.
Founder - HSU, Lai-Wang
Founder - HSU, Lai-Wang

POCT
Three Universal Values

Create a Risk-Free Environment

Build a low-risk power system with stable and safe protection.

Maintain Stable and Safe Power

Ensure system reliability and avoid power outage risks.

Support a Net-Zero Future

Promote green energy for a sustainable and eco-friendly world.

With Elevators, Don't Forget the Stairs

Longmen Technical Service Co., Ltd. focuses on providing efficient and safe power protection solutions to create a friendly, stable, and sustainable power environment.

The core POCT system features a revolutionary passive design with no external power needed, automatically activating protection with top-tier speed and anti-vibration capabilities. Based on three core values—risk-free environment, stable power supply, and net-zero sustainability—the company is committed to building a green and harmonious world with cutting-edge protection technology.

Learn More

Dedicated to providing innovative technological solutions that protect personnel, living environments, and electrical equipment, we aim to achieve a stable, safe, clean, and sustainable living environment. Our focus is on leading industry development and supporting enterprises in reaching net-zero carbon emissions and sustainability goals.

Inventor

HSU, Lai-Wang

IEEE Xplore
Engineering & Technology Research Platform

IEEE Xplore is a leading digital library offering high-quality academic resources in electrical engineering, electronics, and computer science. It enables researchers and engineers to access the latest journal articles, conference proceedings, and technical standards—driving forward innovation.

  • Print ISSN: 2687-7910
  • Online ISSN: 2687-7910
  • Publication Date: May 15, 2024
  • Published in: IEEE Open Access Journal of Power and Energy
  • Title: A Novel Passive Over-Current Trip Device for Seismic Resilience

View on IEEE Xplore >>

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