HV/MV Equipment
Live Tank Circuit Breakers

Home > HV/MV Equipment > Circuit Breakers > Live Tank Circuit Breakers

Related Links
  Circuit Breaker Monitoring
  Circuit Breaker Services
  How does it work
  Interactive Selector Guide

GL 107X
Live tank circuit breaker from 36 kV up to 40.5 kV
Highly Reliable Performance

GE’s GL 107X live tank circuit breakers for outdoor installation are provided with third-generation self-blast interrupter chambers and spring-operated mechanisms. The field-proven interrupter chamber operates on the energy-optimized self-blast principle. This live tank circuit breaker provides a high level of reliability for customers, even under extreme conditions and climates or in highly active seismic areas.

The GL 107X live tank circuit breaker is preset, pre-filled with SF6 and completely assembled at the factory before shipping (pole columns, base frame and spring-operated mechanism). Due to this preassembly, no adjustments are necessary during installation and commissioning of the circuit breaker which allows for quick and easy installation on site with long intervals between maintenance.

GE Advantage

High Quality Components

The GL 107X live tank circuit breaker provides high reliability based in part on high quality components, including:

  • Third-generation self-blast interrupter chamber
  • Operating linkages in one common gas enclosure forming part of the base frame
  • Only one seal is dynamically stressed
  • Insulator flanges sealed with Portland cement
  • Pressure relief system for passive protection of both substation and personnel
  • Compact design in line with considerations of current transformers
  • Field-proven, temperature-compensated density monitor with two-stage transducer and three-color dial
  • Easy access to the SF6 filling connection (type DILO)
  • Extruded aluminum base frame
  • Reliable spring-operated mechanism with position indicator clearly visible from outside

Installation and Maintenance

  • Preset at factory before shipping; no adjustments necessary during installation and commissioning
  • Pre-filled with SF6 at factory before shipping
  • Circuit breaker completely assembled before delivery (pole columns, base frame and spring-operated mechanism

Advanced Testing

Our live tank circuit breakers meet the requirements of national and international standards. This has been confirmed by comprehensive type tests according to the latest IEC and ANSI standards.

Certified Quality

The entire development and production procedures for our live tank circuit breakers are fully compliant with the latest ISO 9001, ISO 14001 and OHSAS 18001 quality standards. This ensures the high quality of our products and services, which is confirmed by regular audits.


Breaker type GL 107X F1/3120 GL 107X F1/3120 GL 107X F1/3120
Rated voltage 36 kV 38 kV 40.5 kV
Rated frequency 50 Hz 60 Hz 50 Hz
Rated normal current up to 2,000 A up to 2,000 A up to 2,000 A
Rated short-circuit breaking current up to 31.5 kA up to 25 kA up to 31.5 kA
Rated short-circuit making current 80 kA 65 kA 80 kA
Rated duation of short-circuit 3 s 3 s 3 s
Opening time 29 ms 29 ms 29 ms
Breaking time 50 ms 50 ms 50 ms
Closing time 58 ms 58 ms 58 ms
Average ambient temperature* -30 oC up to +40 oC -30 oC up to +40 oC -30 oC up to +40 oC
Design altitude* 1,000 m.a.s.l. 1,000 m.a.s.l. 1,000 m.a.s.l.
* Standard values according to IEC; temperatures up to +70 oC and / or higher altitudes available on request