Brochure

PowerPact H-, J-, and L-Frame Circuit Breakers
Glossary
269
02/2016
© 2011–2016 Schneider Electric
All Rights Reserved
overload delay = The length of time the circuit breaker will carry a sustained low-level overcurrent
before initiating a trip signal.
peak current sensing = A method of determining the current by means of detecting the current peaks.
peak let-through current = The maximum peak current flowing in a circuit during an overcurrent condition.
PF = A switch used to indicate a circuit breaker is ready to close.
phase barrier = A barrier which provides phase-to-phase or phase-to-ground isolation.
PowerLogic™ = The family of electronic circuit monitoring systems available on molded case circuit
breakers, insulated case circuit breakers and low-voltage power circuit breakers.
Power-Zone™ = The family of low-voltage and medium-voltage switchgear.
programmable contact module (M6C and M2C) = A programmable module which indicates the type
of fault and the instantaneous and delayed threshold overruns. It may be programmed with
instantaneous return to the initial state, without return to the initial state, or with return to the initial state
following a delay.
primary disconnect contacts = An electrical plug-on connector in the main current path between the
drawout components and the cradle mounted in the equipment.
push-to-close button = A button for manually closing the main contacts after the closing springs are
charged.
push-to-open button = A button for manually opening the circuit breaker.
push-to-trip button = A button for manually tripping the circuit breaker.
racking device shutter = See drawout shaft cover.
racking interlock = An interlock to prevent racking of a drawout circuit breaker when the enclosure
door is open by not allowing the racking crank to be inserted into the circuit breaker.
rating plug = A component which plugs into the full-function electronic trip unit, establishing the
maximum continuous current rating of the circuit breaker.
remote reset after fault (RES) = A component which resets the overcurrent trip switch (SDE) and the
mechanical operator after tripping.
RES = See remote reset after fault.
residual ground-fault sensing = A means of providing equipment ground-fault protection utilizing
sensors on each individual phase.
restraint interface module (RIM) = A component which allows zone-selective interlocking
communication between Square D™ full-function electronic trip systems, add-on ground-fault modules
and zero-sequence ground-fault relays.
RIM = Restraint interface module.
RMS = Root-mean-square.
RMS current sensing = A method of determining the true RMS current of sinusoidal and non-sinusoidal
waveforms by sampling the current waveform a number of times per cycle, then calculating the true RMS
value.
safety shutter = A device that closes to block access to the main disconnects when the circuit breaker
is in the disconnected, test or withdrawn position.
SDE = See overcurrent trip switch.
secondary disconnect contacts = An electrical plug-on connector in the secondary (control) circuit
between a drawout circuit breaker and its cradle in the equipment.
sensor = The current sensing element within the circuit breaker which provides the sensing function
for that circuit breaker.
sensor plug = A component used with a Micrologic trip system to set the sensor size of a circuit breaker.