GL 310, GL 311 and GL 312

Live tank circuit breakers from 100 kV up to 145 kV

Reliable Performance in Low Temperatures

GEâ€™s GL 310, GL 311 and GL 312 live tank circuit breakers for outdoor installation are designed for temperatures down to -60Â°C with gas mixture and -40Â°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%.

GEâ€™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.

Circuit Breaker Monitoring

Circuit Breaker Services

How does it work

Interactive Selector Guide

Brochures

Manuals

How does it work

Circuit Breaker Monitoring

Circuit Breaker Services

How does it work

Interactive Selector Guide

Brochures

Manuals

How does it work

GL 310, GL 311 and GL 312

Live tank circuit breakers from 100 kV up to 145 kV

Reliable Performance in Low Temperatures

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 SF₆Â filling connection (type DILO)
SF₆Â 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.

Specifications

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 toÂ 40 kA	up toÂ 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	â¤70 ms	â¤70 ms	â¤70 ms
Average ambient temperature*	-30 Â°C up to +40 Â°C	-30 Â°C up to +40 Â°C	-30 Â°C up to +40 Â°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 Â°C up to +70 Â°C and/or higher design altitudes available on request

Drawings