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Live Tank Circuit Breakers

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GL 310, GL 311 and GL 312
Live tank circuit breakers from 100 kV up to 145 kV
Reliable Performance in Low Temperatures

GE’s GL 310, GL 311 and GL 312 live tank circuit breakers for outdoor installation are designed for temperatures down to -60°C with gas mixture and -40°C with pure SF6, and feature the latest technologies in interrupter chambers and spring-operated mechanisms. Our latest double motion technology effectively reduces the opening energy by approximately 65%.

GE’s live tank circuit breakers provide a high level of reliability, even under extreme conditions and climates, or in highly active seismic areas. The circuit breakers are completely assembled before delivery, allowing for quick, easy installation and commissioning with long intervals between maintenance. The interrupter chamber can be independently disassembled without having to remove the entire pole column, and the pole units are pre-filled at the factory before shipping.

GE Advantage

High Quality Components

The GL 310, GL 311 and GL 312 live tank circuit breakers provide high reliability based in part on high quality components, including:

  • Interrupter chamber with integral double motion technology and self-blast system
  • Pressure relief system for passive protection of both substation and personnel
  • Field-proven, temperature-compensated density monitor with two-stage transducer and three-color dial
  • Easy access to the SF6 filling connection (type DILO)
  • SF6 non-return (check) valve on each pole column
  • Protected opening springs inside each pole column
  • Hot-dip galvanized steel parts
  • Mechanism housing made completely of aluminum
  • 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
  • Pole units pre-filled with SF6 at factory before shipping
  • Independent disassembly of the interrupter chamber without having to remove the entire pole column
  • Single-pole operated circuit breakers partially pre-assembled before delivery (base frame with the mounted and wired mechanisms)

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 310 F1/4031 P/
GL 310 F3/4031 P
GL 311 F1/4031 P/
GL 311 F3/4031 P
GL 312 F1/4031 P/
GL 312 F3/4031 P
Rated voltage 100 kV 123 kV 145 kV
Rated frequency 50/60 Hz 50/60 Hz 50/60 Hz
Rated normal current up to 3,150 A up to 3,150 A up to 3,150 A
Rated short-circuit breaking current up to 40 kA up to 40 kA up to 40 kA
Rated short-circuit making current 104 kA 104 kA 104 kA
Rated duration of short-circuit 3 s 3 s 3 s
Opening time 28 ms 28 ms 28 ms
Break time 50 ms 50 ms 50ms
Closing time ≤70 ms ≤70 ms ≤70 ms
Average ambient temperature* -30 °C up to +40 °C -30 °C up to +40 °C -30 °C up to +40 °C
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 down to -55 °C up to +70 °C and/or higher design altitudes available on request


GL 310, 311 & 312