APFC148 Automatic Power Factor Controller
Selec APFC148 Automatic Power Factor Controller (12/14 Stage)
Microprocessor-based 3-CT sensing APFC relay with zero programming, intelligent switching algorithm, dual-color LCD, and up to 14 relay outputs for industrial capacitor bank automation.
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The Selec APFC148 is a high-performance Automatic Power Factor Controller designed for intelligent capacitor bank switching using 3-CT sensing. With zero programming, a dual-color LCD display, configurable alarms, and up to 14 relay stages, it offers fast and accurate PF correction for industrial and commercial APFC panels.
Key Features
3-CT Sensing for precise PF correction
Zero programming—automatic setup
LCD display with dual-color backlight
Up to 12 or 14 relay stages
Intelligent switching algorithm
Auto capacitor bank switching
Programmable alarms and on-screen alarm display
Dual password protection
Measures PF, power, voltage, current, harmonics (up to 31st order)
Auto/Manual control modes
Technical Specifications
Display
| Parameter | Specification |
|---|---|
| Display Type | LCD, dual-color backlight |
| Digits | 3 lines × 4 digits |
Input Specifications
| Parameter | Specification |
|---|---|
| Rated Voltage (L-N) | 11–300V AC |
| Rated Voltage (L-L) | 50–520V AC |
| Rated Input Current | 5A nominal (Min 11 mA, Max 6A) |
| Frequency | 45–65 Hz |
| Burden | 20 mΩ |
| Accuracy | V, I: ±0.5% FS; Power: ±1% |
Measurement Range
| Parameter | Specification |
|---|---|
| PF Range | 0.8 Lag to 0.8 Lead |
| Energy & Harmonics | kW, kVA, kVAR, THD, up to 31st harmonic |
Output
| Parameter | Specification |
|---|---|
| Relay Contacts | 1 NO (per stage), 6A max |
| Steps | 12 or 14 stages |
| Relay Rating | 5A/250V AC |
Control Settings
| Parameter | Specification |
|---|---|
| Target PF | 0.8 lag to 0.8 lead |
| Step Time | 1–999 sec |
| Discharge Time | 1–999 sec |
| Control Mode | Auto/Manual |
| Control Sensitivity | 5–100% |
CT/PT Settings
| CT Primary | 1A–9999A (programmable) |
| CT Secondary | 1A or 5A |
| PT Primary | 100–500 kV (programmable) |
| PT Secondary | 100–500V |
Environmental
| Parameter | Specification |
|---|---|
| Operating Temp | 0°C to 60°C |
| Storage Temp | –20°C to 60°C |
| Humidity | 95% RH (non-condensing) |
| Mounting | Panel mount |
| Weight | 528 g (12-stage) / 508g (8-stage version) |
Applications
Industrial APFC Panels
Automatic capacitor banks
Commercial & industrial power distribution
CNC machines, HVAC systems, motors
Utility power factor management
What's in the Box
APFC148 Controller
Mounting clamps
Terminal guide
User manual/wiring diagram
Warranty card
FAQ
Q1. Does APFC148 require external CTs?
Yes, it uses 3-CT sensing for precise PF measurement.
Q2. How many capacitor steps can it control?
12 or 14 steps depending on the model.
Q3. Can it work with mixed capacitor stages?
Yes—intelligent auto-learning supports varied kVAR steps.
Q4. What is the target PF range?
0.8 lag to 0.8 lead.
Q5. Can it detect over/under compensation?
Yes, alarms are programmable and displayed on screen.
Q6. Does it support manual operation?
Yes, both Auto and Manual modes.