APFCU Automatic PFC Unit

SERIES FEATURES

Our Automatic Power Factor Correction Units (APFCU) are custom designed for 208V, 480V, and 600V applications. Designed with higher-rated capacitors for longer life expectancy, these units automatically maintain target power factor while minimizing inrush with soft-switching contactors. To ensure even wear on the capacitors, our units use circular-switched steps.

Our APFCU is complete with IEC rated contactors, HRC fusing, a digital microprocessor controller, a split core current transformer, and inrush current limiters. The standard ventilation kit included is for a maximum ambient temperature of 35°C (95°F).

The units are enclosed in a NEMA 1 ASA 61 grey enclosure by default, with the options of NEMA types 2, 12, 3, 3R, 4, and X versions. Custom paint options and custom enclosures for dimension restrictions are also available. Other available options include blown fuse indicators, iron core 3-phase reactors for harmonic contaminated environments, and a disconnect device.

Specifications may be seen in APFCU Specs, and more detailed information may be found in APFCU Brochure.

Series Comparison: APFCU VS RTAPFCU

We recommend using automatic units in place of static units above 40kVAr if the capacitor bank is not switched with a motor, to protect equipment from voltage rise in low load conditions.

APFCU uses mechanical switching with IEC rated, soft-switching contactors to minimize inrush. Real-time APFCU uses electronic switching, and switches at zero crossing for zero inrush. Electronic switching allows for switching times to be as fast as 60 times per second.

In most cases a Real-time unit is not required, and an automatic unit is suitable.

Both units are custom made, and maintain their target power factor. Warning labels are included per C.E.C. standards.

NEMA Types

Type 1: Indoor. Protects equipment from falling debris.

Type 2: Indoor. Protects equipment from falling debris and dripping water from sprinkler systems.

Type 12: Indoor. Protects equipment from falling debris, circulating dust, and dripping water from sprinkler systems.

Type 3: Outdoor. Protects equipment from falling debris, windblown dust, rain, and snow. Withstands external formulation of ice.

Type 3R: Outdoor. Protects equipment from falling debris, rain, and snow. Withstands external formulation of ice.

Type 4: Outdoor. Protects equipment from falling debris, windblown dust, rain, snow, and hose directed water. Withstands external formulation of ice.

Capacitor Specifications
Voltage Ratings208 – 999 V
Maximum kVAr per 3 phase casing (60 Hz)13.6 kVAr @ 208V (rated 20.4 kVAr @ 300V)
25.0 kVAr @ 480V (rated 30.0 kVAr @ 525V)
25.0 kVAr @ 600V (rated 33.0 kVAr @ 690V)
16.7 kVAr @ 600V (rated 45.94 kVAr @ 999V)
SpecificationsUL and cUL,
CSA CAN3-C155-M84 (1986),
CSA C22.2 No. 190-M1985,
IEC Publication 831-1, 831-2,
VDE 560-47, 560-47,
EN60831-1, EN60831-2
InsulationPhMKP Series: non-PCB, natural oil impregnant, flash/ignition points 285/315°C.
PhMKP(g) Series: non-PCB, dry/gas agent, available on request (special order).

Both series are biodegradable and non-toxic.
ElectrodesVacuum-metallized on one side of the plastic film.
TemperatureAmbient: -40°C to +45°C
Storage: -40°C to +60°C
Inrush CurrentMaximum 300 times the rated current.
Loading Capacity1.10 times the rated voltage.
1.30 times the rated current.
1.50 times the rated output.
Frequency Ratings50 or 60 Hz
Capacitor CasingSeamless aluminum
Losses≤ 0.25 Watts per kVAr
Discharge Resistors50V or less in one minute after disconnection of supply voltage.
DielectricPolypropylene film
Safety FeaturesTouch-safe terminal.
Removeable discharge resistor.
Self-healing technology.
Grounding/mounting stud at base of capacitor.
Over pressure tear-off fuse (pressure sensitive circuit interrupter) internally fused up to 10kAIc.
Special ApplicationsDesigned for use in harmonic filters.

Other items you may be interested in: RTAPFCU Real-Time Automatic PFC Unit, R500s Switched Packaged Capacitor

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