Automatic Power Factor
Correction Systems
FEATURE: Enclosure is rigid design, bolted
construction with floor; economical in size.
Function: Accommodates multiple trays of kVAR;
provides for modularity and enclosure expansion;
allows for maximum kVAR in a small footprint;
compatible with match & line to switchgear and
motor control centers.
FEATURE: Enclosure uses a powder coat finish
painted light gray, includes 4-point latch, mechanism
and locking handle.
Function: Many years of superior protection and
durability of fabricated metal, hinges/hardware are
rust resistant for long life; optimum personnel safety.
FEATURE: Designed for convection or forced air
ventilation.
Function: Allows for proper heat dissipation of
components, extending life and maintaining the
integrity of operation.
FEATURE: Enclosure offers front, rear and both side
access.
Function: Provides several alternatives for service
personnel while still allowing equipment to be
located near or adjacent to a wall.
FEATURE: Top or bottom rear entry feed.
Function: Open access for easier installation of
equipment.
FEATURE: Complete assembly is UL and c-UL listed.
All components are UL listed/recognized or CSA
approved.
Function: Assures safety requirements met by
third party agency for complete assembly, not just
individual components.
FEATURE: Design of internal trays includes all major
components.
Function: One design with electrical and mechanical
devices mounted and wired simplifi es equipment
construction and testing continuity; allows for
modularity.
FEATURE: Design of internal tray accommodates
multiple kvar ratings and allows for tray expansion.
Standard “step� sizes are 25 kVAR, 50 kVAR, 100 kVAR
and 200 kVAR (480 VAC example).
Function: Standardization of trays provides greater
user selection to match switched kVAR needs today
and in the future.
StacoVAR equipment is designed and built to bring
you the highest quality product at the lowest price
possible. Our personal attention to the design and
assembly of each unit gives you powerful benefits
and a long list of standard and optional features that is unmatched in the industry.
Single unit enclosure (480 VAC)
accommodates up to 800 kVAR
or 600 kVAR with a molded-case
circuit breaker. When equipped
with reactors, 400 and 300
kVAR (C/B) are available. Single
unit enclosure’s approximate
dimensions are 83"H x 32"W x
24"D (with lifting eyes removed).
FEATURE: Multiple trays off er large total kVAR rating
in one enclosure.
Function: Reduces cost and floor space.
FEATURE: Bottom of trays include a unique venting
structure; trays are galvanized steel.
Function: Tray ventilation assures proper convection
flow, reducing potential for hot spots within enclosure;
improves overall cooling; galvanized steel for added
durability and resistance to environmental elements.
FEATURE: Clearance between trays allows for heat
dissipation and easy replacement.
Function: Little heat build-up allows the cooler
operating capacitors to have a longer life; should a
capacitor need replacement (damage from lighting or
other electrical fault), the unit can be easily replaced.
FEATURE: Tray to tray wiring is simple and neatly
configured. Bus bar is center mounted, bus links can
be easily removed/added should front servicing be
required, or another tray added.
Function: Helps service personnel locate connections,
reduces electrical stress, and makes trouble-shooting
or tray equipment additions easier.
FEATURE: All trays use a grommet where “through
wiring points� are located.
Function: Grommet protects wiring from any sharp
metal edges.
​FEATURE: Control wiring with numbered terminations
and quick connect plugs, when multiple enclosures
are used.
Function: Simplifies servicing.
FEATURE: Bus bar is electrical grade copper, Brite®
Nickel Plated and braced for 50k amps.
Function: Provides for best conductivity versus
aluminum, or non-plated type material; maintains
mechanical integrity should a major electrical fault
occur. Bus bar is not insulated, to help with visual
safety. Bus bar size is ½" x 2 ½" (480 VAC example).
FEATURE: Heavy Duty capacitors are polypropylene
type, three phase with discharge resistors and
overpressure safety device.
Function: Capacitors can operate in more
stringent conditions eff ectively with the dense resin
encapsulation, self-healing, metallized fi lm, which
provides for a dry (no free liquid) system. Capacitors
accommodate up to a 10% THD environment and
have a five year warranty.
FEATURE: Contactors are high duty, designed for
capacitor switching and include damping resistors.
Function: Specifi cally designed for high on/off
operation, helps reduce high currents from back-toback
switching of capacitors and extends life.
FEATURE: Contactors are same size for all part
numbers with “like steps.�
Function: Assures best switching values; spare parts
are more uniform, easier to obtain.
FEATURE: Fuses are rated for
200 kaic, 700 VAC, high overload
capability design, reacts quickly
to short-circuit conditions; fuse
ampere sizes are the same for “like�
kVAR steps.
Function: Maximum equipment
protection; spare parts are more uniform, easier
to obtain.
FEATURE: Fuses include individual blown fuse
indication, plus available indication lights (each phase)
on enclosure front door.
Function: Helps to quickly identify and replace specifi c
fuse.
FEATURE: Location of relays and CPT (CPT has primary
and secondary fuses).
Function: Allows for internal control devices to operate
and be functionally tested at the factory; ease of
serviceability; additional personnel safety.
FEATURE: Standard 12-step StacoVAR Intelligent Power
Factor Controller has a front panel display with multiple
programmable functions and alarm.
Function: Provides for accurate regulation and control
of needed kVAR; all information is contained in one
location; easy to use.
FEATURE: PF controller is automatically disabled when
system overvoltage condition exists.
Function: Additional personnel safety.
FEATURE: Removable lifting eyes (top) included with
enclosure.
Function: Makes handling/installation simpler.
FEATURE: Optional molded case circuit breaker (C/B),
CT (split-core type, multi-tap), and TVSS.
Function: Breaker allows for a disconnection means
at the equipment location, and includes integral
plexiglass safety cover. CT is not required to be
purchased from a second source, and allows for a “one
size fi ts all.� TVSS enhances equipment protection from
surges.
FEATURE: Other power factor and harmonic
correction technologies available.
Function: Certain requirements or more complicated
applications can be met with the use of thyristor
switching, dynamic compensation/real time power
factor correction, or by employing active (power
electronic) harmonic fi lters.
Automatic Power Factor Correction
(De-Tuned) with Reactors
(All the features listed above, plus the following)
FEATURE: Tray design includes a barrier between
capacitors and reactors.
Function: Reduces heating between components;
helps improve expected life.
FEATURE: Enclosure includes fan package.
Function: Forced air cooling improves movement
of ambient air, helping to cool components.
FEATURE: Three phase iron core reactors, copper
wound, UL recognized, designed for 3.78 (well under
the 5th order at 227Hz).
Function: Built for long life, sized to accommodate
higher than normal currents to protect capacitors while
providing mitigation.
FEATURE: Iron core reactors include a thermal switch.
Function: Provides automatic shut-down when reactor
overheats to maintain the integrity of components
while still allowing the system to partially operate.
FEATURE: Heavy duty capacitors used with reactors
are rated for 690 VAC (480 VAC system), 480 VAC (240 VAC
system).
Function: Harmonic environments generally produce
high currents, which may damage or reduce the life of
the capacitor. 690 VAC rated capacitors help mitigate
these concerns with a higher level of performance.
Controller Front Panel
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