Brochure

PowerPact H-, J-, and L-Frame Circuit Breakers
General Information
11
02/2016
© 2011–2016 Schneider Electric
All Rights Reserved
Section 2—General Information
The PowerPact™ H-, J-, and L-frame circuit breakers are designed to protect electrical systems from
damage caused by overloads and short circuits. H- and J-frame circuit breakers are available with
either thermal-magnetic or Micrologic™ electronic trip units. L-frame circuit breakers are available with
Micrologic electronic trip units only.
H- and J-frame circuit breakers with thermal-magnetic trip units contain individual thermal (overload)
and instantaneous (short circuit) sensing elements in each pole. The amperage ratings of the thermal
trip elements are calibrated at 104°F (40°C) free air ambient temperature. Per the National Electric
Code
®
(NEC
®
) and the Canadian Electrical Code, standard circuit breakers may only be applied
continuously at up to 80% of their rating. Circuit breakers rated for 100% operation are available but
require specially-designed enclosures and 194°F (90°C) rated wire.
Devices with the Micrologic electronic trip unit provide adjustable protection settings for greater system
flexibility. In addition to electronic protection, Micrologic trip units allow users to monitor both energy
and power. Through direct access to in-depth information and networking using open protocols,
PowerPact circuit breakers with Micrologic trip units let operators optimize the management of their
electrical installations. Far more than just a circuit breaker, these devices are a measurement and
communication tool ready to meet energy-efficiency needs through optimized power requirements,
increased energy availability, and improved installation management.
Applications
PowerPact H-, J-, and L-frame circuit breakers offer high performance and a wide range of
interchangeable trip units to protect most applications.
Electronic trip units provide highly accurate protection with wide setting ranges and can integrate
measurement, metering and communication functions. They can be combined with the front display
module (FDM121) to provide functions similar to a power meter.
Table 5: Applications
Power Meter
PowerPact H-, J-, and L-frame circuit breakers equipped with Micrologic 5/6 trip units offer
type A (ammeter) or E (energy) metering functions as well as communication capability. Using
Micrologic trip unit sensors and intelligence, PowerPact H-, J-, and L-frame circuit breakers
provide access to measurements of all the main electrical parameters on the built-in screen, on a
dedicated front display module (FDM121) or through the communication network.
Operating assistance
Integration of measurement functions provides operators with operating assistance functions
including alarms tripped by user-selected measurement values, time-stamped event tables and
histories, and maintenance indicators.
Front display module
The main measurements can be read on the built-in screen of Micrologic 5/6 trip units. They can
also be displayed on the equipment FDM121 along with pop-up windows signalling the main
alarms.
Communication Network
PowerPact H-, J-, and L-frame circuit breakers equipped with Micrologic 5/6 trip units provide
communication capabilities. Simple RJ45 cables connect to a Modbus communication interface
module.