Guide Form Specifications
General Requirements
Circuit Breakers shall be of insulated case construction. They
shall be UL Listed under Standard UL 489, UL 489-SB2, CSA
Certified, and I EC 947-2 Certified and shall meet the require
ments of NEMA Standard AB1.
Circuit breakers shall be (manually) (electrically) operated,
(drawout) (stationary) mounted with features and accessories
described in these requirements. Breakers shall have a mini
mum voltage rating of 600 Vac, and shall be rated to carry
100% of the current rating of the breaker continuously.*
Breakers shall have minimum UL Listed interrupting ratings
as indicated on the d rawings. All manually operated breakers
shall be field convertible to electrical operation by means of
the addition of an internally mounted electrical operator. Ad
dition of an electrical operator shall not change the physical
dimensions of a breaker.
Circuit breakers shall be constructed of a high-strength,
glass-reinforced insulating case. Construction shall provide a
double level of insulation between primary current-carrying
parts and operating personnel. The interrupting mechanism
shall contain arc chutes with steel vent grids to suppress arcs
and cool vented gases. I nterphase barriers shall be included
to completely isolate each pole. For each breaker, the close
and latch rating shall be equal to its short-time rating to help
assure selectivity with downstream devices when closing
into a fault.
Breakers shall contain a true two-step stored energy operat
ing mechanism p roviding quick-make, quick-break operation
capable of charging-after-closing operation. It shall be pos
sible to discharge the closing spring without closing the main
contacts. The maximum closing time shall be three cycles at
nominal voltage.
Attempting to close a circuit breaker while an accessory un
dervoltage release is de-energized or, while a shunt trip with
lockout is energized, or while a bell alarm with lockout is ac
tivated, shall result in a "kiss-free" operation of the contacts.
Common tripping of all poles shall be standard. Breakers
shall be capable of a minimum of 10,000 mechanical open
and close operations without any requ ired service.
When drawout brea kers a re in the ful ly withdrawn position,
there shall be provisions for tilting the breakers for inspec
tion, maintenance or removal. It shall be possible to replace
the primary disconnect fingers with the breakers in the
withdrawn position.
Each breaker shall include a retractable charging handle,
close pushbutton, open pushbutton, closing spring charge/
discharge indicator and breaker ON/OFF indicator mounted
on the front of the breaker. Each breaker shall have as stan
dard, a padlocking provision to prevent closing the breaker
when padlocks are installed. Padlocking provisions shall ac
cept up to three padlocks with 1/4" to 3/8" diameter shanks.
This provision shall meet OSHA and California Code (EUSERC)
requirements.
Each stationary and drawout breaker shall have provisions
for up to 72 dedicated secondary terminal points. All discon
nected points shall be capable of being probed from the
front of the breaker. All breaker control and accessory wiring,
including wiring for future accessories, shall be pre-wired to
integral terminal blocks which shall be clearly identified by
number and function. Each terminal point shall have space
available for two AWG#18#12 wires per terminal and cus
tomer circuit identification.
Each circuit breaker shall contain the following accessories
(shunt trip with or without lockout) (undervoltage release)
(bell alarm) (bell a larm with lockout)
[
(4 or 8 or 12 stage) SPDT
auxiliary switches] (remote close solenoid) (remote "charged"
indicator). All accessories shall be field installable. Field instal
lation of shunt trip (with or without lockout), undervoltage
release, bell alarms - with and without lockout shall require
no adjustments, no internal wiring and no removal of the
circuit breaker cover. The bell alarm and bell alarm with
lockout shall each contain a mechanical target, which shall
extend from the front cover when the device operates. The
bell alarm (alarm only) shall reset automatically when the
breaker is closed. The bell alarm with lockout must be reset
by depressing the mechanical pop-out target before the
breaker can be closed. The bell alarm and the bell alarm with
lockout shall be independently fie\d-configu rable to operate
in response to an overcurrent and/or protective relay opera
tion, plus any combination of shunt trip and/or undervoltage
release operation - including no response to a protection
trip, shunt tripping or undervoltage release trip. Note: for the
Power+™ trip u n it , the bell alarm and bell alarm with lock-
out respond to an overcurrent operation only. The shunt trip
(with or without lockout) shall be continuously rated with no
requirements for a cut-off switch.
Each circuit bre a ker shall contain the following mechanical
accessories (operation counter) (sealable limited access "ON"
and "OFF" pushbutton cover)
[
(1, or 2 or 3 or 4) cylinder key
interlock provision ] (shutters to cover drawout/stationary
primary disconnects when the breaker is racked out) (racking
padlock provision to prevent operation of the breaker racking
mechanism) (door interlock with defeat mechanism to pre
vent opening the hinged breaker compartment door when
the breaker is closed) (walking beam i nterlock for stationary
breakers to prevent two adjacent breakers from being on
the same time) (mechanical interlock for drawout breakers
to prevent two adjacent breakers from being on at the same
time). All mechanical accessories shall be capable of being
field i nstalled.
* 4000A Stationary 80% rated.
109
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