Low Voltage Power and DC Circuit Breakers - GE Industrial Systems

Low Voltage Power and DC Circuit Breakers
Trip Units
EntelliGuard ® TU Trip Unit Features
EntelliGuard ® TU Trip Unit
New capabilities in the EntelliGuard ® TU Trip Unit provide ultimate
system reliability and selectivity without sacrificing circuit protection.
This superior addition enhances the Power Break ® II breaker
with a Waveform Recognition Instantaneous Algorithm that
eliminates costly downtime due to nuisance tripping. It enables
harmonic analysis four cycles prior and after an event, and
discerns whether a downstream breaker/fuse is clearing the fault.
The unit also includes Instantaneous Zone Selective Interlocking
(I-ZSI) (can be used as a feeder and downstream device with a
power circuit breaker upstream) which delivers simultaneous and
independent ZSI of Short Time, Ground Fault and Instantaneous
protection, providing the ability to overlap the Instantaneous on
the Main and Feeder breakers. Together, these innovative abilities
achieve HRC2 with currents as high as 100kA with simultaneous
flash protection and selectivity.
The EntelliGuard ® TU Trip Unit offers optimum circuit safety
and arc flash protection with the Reduced Energy Let-Through
function, providing a faster instantaneous trip that may be
used if faster and more sensitive protection is required
temporarily. It is commonly referred to as an “Arc Flash Switch”
or “Maintenance Switch”.
The new and improved trip unit design delivers selectivity tools
not previously available in GE circuit breakers:
Exclusive EntelliGuard ® TU Trip Unit Features
Designed for Flexibility
—A wide range of continuous adjustment Long Time delays
ensure the circuit breaker can be exactly adjusted in to your
selectivity and protection needs.
—Multiple Short Time diagonal bands tune your protection to
exactly where it needs to be.
—Flexible time current settings and curves -Standard Long Time
characteristics exactly mimic the curve of a thermal magnetic
circuit breaker.
—Flexible Time Current Curves: 44 Long Time Shapes I2T and
I4T (fuse), 3 Short Time I2T slopes, Short Time adjustable in 55
ms increments, a Selective Ground Fault curve
Instantaneous Protection
—Instantaneous pick-up is adjustable up to 15 times the plug
rating on frames 800-2000A, 13 times on 3000A frames and
up to 9 times on 4000A frames.
—A separately adjustable fast instantaneous trip- useful for
when the circuit must provide the best possible protection
and arc flash performance while sustaining normal load.
—An override instantaneous - provides fast tripping for the
largest bolted fault currents to minimize potential damage.
—Up to 17 Short Time bands allow you to set your circuit breaker
to sustain load requirements without slowing protection.
—Ground Fault Alarm via I/O or Modbus Communications
—Ground fault protection with faster time bands, multiple
slopes and the ability to coordinate a 1200A ground fault
with an 800A circuit breaker – a ratio four times better than in
previous generation trip units
Rev. 9/12
Prices and data subject
to change without notice
Section 6
Maintenance and Diagnostics
—Universal trip plug fits any trip unit.
—Flexible serial communication via Modbus RTU
—Integrates directly into GE’s EnerVista ® Power Management
System.
—Large backlit LCD with detailed, easy-to-see descriptions.
—Health status via breaker LED indicating normal operation,
errors, pickup, and trips while providing non-volatile memory
with a continuous self-testing microprocessor
—Lithium battery to eliminate need for external power for
set-up and review
—10 event Log with Date/Time Stamp: Stores the last 10 events.
Date/Time with 24Vdc Power.
—Thermal Memory
—WaveForm Capture: 40 Samples/Cycle, 4 cycles prior and 4
cycles post event in COMTrade format.
—Free set-up software
To learn more about EntelliGuard ® TU Trip Unit
features see brochure DEA-461C.
www.geindustrial.com BuyLog ® Catalog 6-49