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Live Tank Circuit Breaker LTB D 72.5 – 170 kV

Protecting more networks than any other high-voltage breaker

The LTB D is suitable for breaking current up to 40 kA, with fast interruption (2 cycles) for maximum power system stability. It is configurable for all applications and environments.

With the optional MotorDriveTM mechanism, the LTB D is ultra-quiet and smart grid enabled. The installation and commissioning is fast and simple, and there is no need for site adjustments. It is proven in extreme locations including deserts, the tropics and cold climates - withstanding natural disasters from hurricanes to major earthquakes. 

The LTB D is designed and type tested in accordance with international standards IEC, ANSI. It is also, tested to national standards (GOST, DL, and DIN).

LTB D is also available as a Disconnecting Circuit Breaker where the disconnecting function is integrated in the breaker.


  • Line, transformer, reactor and capacitor switching
  • Switching of harmonic filters
  • Low frequency railway applications 
  • Connecting renawable power to the grid

Why Hitachi Energy?

  • Local and global Hitachi Energy industry and application support
  • Lowest failure rate - one-third of Cigré average according to report on high-voltage circuit breakers reliability, ( Cigré group A3.06  October 2012)
  • Low environmental impact
  • MotorDriveTM mechanism option for ultra-quiet functionality
  • High mechanical and electrical endurance exceeding the industry standard
  • Global service organization, local everywhere 

Brief performance data

LTB D    
Rated voltage kV 72.5 - 170
Max rated current A 3150
Max rated breaking current kA 40
Rated power frequency Hz 50/60
Ambient temperature °C
- 50 - +50

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