APFC Panel & Capacitor Panel Manufacturer in Coimbatore, Tamil Nadu
Akshayam Controls & Automation designs and builds Automatic Power Factor Control Panels for industrial and commercial electrical systems. Also called APFC panels or capacitor panels, they hold your power factor steady as plant load changes through the day. Every panel is sized from your measured load and target power factor, then built and tested at our Coimbatore works.
An APFC relay watches the phase angle between voltage and current, calculates the reactive power needed, and switches capacitor stages in or out through capacitor-duty contactors. Detuned reactors go in where harmonics are present. Sizing comes from your measured load, not a rule of thumb.
Panels are built with L&T (L&K), Schneider Electric, Siemens, ABB and C&S switchgear and supplied across Coimbatore, Tiruppur, Erode, Salem, Karur, Madurai and Trichy, plus Bengaluru and Karnataka, Kochi and Kerala, and projects throughout South India — usually alongside PCC panels and MCC panels from the same works. As a leading APFC panel manufacturer in Coimbatore, we ensure total reliability.
What is an Automatic Power Factor Correction (APFC) Panel?
Motors, drives, welding sets and transformers draw two kinds of power: active power (kW), which does the work, and reactive power (kVAr), which maintains their magnetic fields. The more reactive power a plant draws, the lower its power factor.
A low power factor means more current for the same useful output — hotter cables, less usable transformer capacity, and under most tariffs a penalty on the bill.
An APFC panel supplies that reactive power locally from capacitor banks, switched automatically stage by stage as the load changes, so the incoming supply sees a power factor close to unity.
How Does an APFC Panel Work?
Load Monitoring
The APFC relay measures voltage, current and the phase angle between them on the incoming supply.
PF Evaluation
It compares the measured power factor against the target and calculates the reactive power (kVAr) needed to close the gap.
Capacitor Switching
Capacitor-duty contactors switch the required stages in or out, chosen to match the demand without hunting between steps.
PF Improvement
The corrected power factor holds close to unity as plant load rises and falls through the shift.
Note: Performance depends on the individual load profile, utility tariff and system specification.
Key Components of APFC Panels
APFC Relay / Controller
The brain of the capacitor panel — measures power factor continuously and decides which stages to switch. Multi-step digital relays, typically 6, 8 or 12 stage.
Capacitor Banks
MPP or APP capacitor units sized in kVAr to supply the reactive power the load demands, split into stages for smooth correction.
Capacitor-Duty Contactors
Purpose-built contactors with damping resistors to handle the heavy inrush that capacitor switching produces — ordinary contactors fail quickly here.
Protection Switchgear
MCCBs, MCBs and HRC fuses protecting each capacitor circuit against short-circuit and overload.
Digital Metering
Multi-function meter showing power factor, kW, kVAr, voltage, current and, where specified, harmonic content.
Busbar System
Copper or EC grade aluminium busbars with proper clearances, insulation and supports throughout the panel.
Detuned Reactors (Optional)
Series reactors that shift the resonant frequency away from dominant harmonics, protecting capacitors in plants with VFD panels and rectifier loads.
Key Features of Our APFC Panels
Automatic Power Factor Control
Continuous correction with no operator intervention — the APFC relay does the work shift after shift.
Staged Capacitor Switching
Stage sizes chosen to suit your load pattern, so correction is smooth rather than jumping between coarse steps.
Custom Capacitor Bank Sizing
Total kVAr and step split worked out from your connected inductive load, measured power factor and target.
Live Power Factor Monitoring
Power factor, current, voltage and reactive power on a digital display at the panel front.
Electrical Protection
Short-circuit, overload and over-voltage protection on every capacitor circuit, with branded switchgear throughout.
Industrial-Grade Enclosure
Sheet steel construction, powder coated, with dust filters and forced ventilation — capacitors last longer when they run cool.
Benefits of Automatic Power Factor Correction
- Holds power factor close to unity as loads change
- Reduces reactive current drawn through incoming cables
- Helps avoid low power factor penalties on the utility bill
- Frees up transformer capacity by cutting apparent current (kVA)
- Supports more efficient use of the existing electrical system
- Automatic stage switching adapts to changing factory load
- Lower current means cooler cables and less distribution loss
- No manual capacitor switching for the maintenance team to remember
- Detuned reactors manage harmonic resonance risk where needed
- A centralised capacitor panel is far easier to maintain than scattered units
Disclaimer: Power factor improvement, penalty reduction and energy savings depend on the facility's load profile and tariff structure.
APFC Panel Applications Across Industries
Textile Industries
Spinning, loom and processing lines where hundreds of motors swing the reactive load through the shift.
Engineering Industries
Foundries, welding shops and induction furnaces — heavy, fluctuating inductive loads that pull power factor down fast.
Automobile Industries
Press shops, assembly conveyors, compressors and cooling towers running on mixed load patterns.
Food Processing
Milling, packaging and refrigeration compressors, usually with long continuous running hours.
Commercial Buildings
HVAC plant, lifts and pump sets in complexes, hospitals and hotels billed on demand tariffs.
Water Treatment
High-HP raw water pumps, aerators and blowers, often with VFDs that call for detuned reactors.
When is Power Factor Correction Required?
A capacitor panel earns its place in some plants and not others. These are the signs it is worth costing:
- Significant inductive load — a lot of AC motors, compressors, fans or welding sets
- A tariff that penalises low power factor, or rewards keeping it high
- Transformer near capacity, where cutting kVA draw releases headroom without a new transformer
- Measured power factor below the utility threshold, commonly around 0.90
Note: Capacitor bank capacity should be selected from measured electrical parameters, not estimated. Recommend a load measurement before finalising kVAr.
Our APFC Panel Manufacturing Process
Load Analysis
We review your connected load, measured power factor, load pattern and recent electricity bills.
Compensation Design
Total kVAr and the stage split worked out from that data, along with whether detuned reactors are needed.
Panel Engineering
Capacitor bank arrangement, APFC relay selection, switching scheme, protection and metering, with drawings for your approval.
Panel Manufacturing
Enclosure fabrication, powder coating, busbar work, capacitor and contactor mounting, and wiring to the approved drawing.
Inspection & Testing
Wiring checks, insulation resistance, HV test, stage-by-stage switching verification and relay setting before dispatch.
Delivery & Support
Dispatched across South India with as-built drawings and documentation, plus commissioning and relay setting assistance on site.
Why Choose Akshayam Controls for APFC Panels?
Sized From Your Data, Not a Guess
kVAr and stage split derived from your measured power factor, load pattern and bills — oversizing a capacitor panel causes as many problems as undersizing.
Switchgear You Already Trust
L&T (L&K), Schneider Electric, Siemens, ABB and C&S components, so the panel matches your plant standard and spares stay easy to source.
Harmonics Taken Seriously
Where VFDs and rectifier loads are present, we assess the need for detuned reactors rather than fitting plain capacitors and hoping.
Build Quality You Can Inspect
Proper capacitor-duty switching, ventilated enclosures, correct wire sizing and a documented pre-dispatch check on every panel.
Real Industrial Experience
APFC panels built for textile mills, foundries, food plants and water treatment works across South India.
Support After Commissioning
Relay settings, stage verification and troubleshooting help once the panel is running — not just at handover.
APFC Panel Specifications
| Parameter | Specification Details |
|---|---|
| Panel Type | Automatic Power Factor Correction (APFC) / Capacitor Panel |
| Application | Reactive power compensation and power factor improvement |
| Installation | Indoor or outdoor, floor-mounted |
| Incoming Supply | 415 V, 3-phase, 50 Hz — rating as per project requirement |
| Capacitor Bank | Customised kVAr stages, MPP |
| APFC Relay | Digital multi-step controller — 6, 8 or 12 stage |
| Switching Arrangement | Capacitor-duty contactors or thyristor modules for fast-changing loads |
| Capacitor & Relay Make | As specified — capacitor and APFC relay makes selected to suit your standard |
| Protection | MCCB / MCB / HRC fuse protection per capacitor circuit |
| Metering | Digital multi-function meter — optional |
| Detuned Reactors | Optional, based on measured harmonic conditions |
| Busbar System | Copper or EC Grade aluminium, sized as per design current and 50 kA fault level |
| Cable Entry | Top or bottom |
| Testing | FAT, Insulation resistance Test, HV test |
APFC Panel Manufacturer Serving Coimbatore, Tamil Nadu & South India
We design and supply automatic power factor control panels and capacitor panels for factories, commercial buildings and treatment plants. Coimbatore and Tamil Nadu are our largest market, followed by Bengaluru and Karnataka, then Kochi and Kerala, with projects across South India. Send us a recent bill and connected load figure and we will size the panel before quoting.
Frequently Asked Questions About APFC Panels
What is an APFC panel?
An APFC panel is an assembly that monitors reactive power demand and automatically switches capacitor banks in and out to hold the power factor near unity. It is also called an automatic power factor control panel, a power factor correction panel or a capacitor panel.
Which APFC relay and capacitor makes do you use?
We build with the APFC relay and capacitor makes your plant standardises on, and can recommend from the established brands if you have no preference. Switchgear is L&T (L&K), Schneider Electric, Siemens, ABB or C&S. Tell us what your maintenance team already stocks and we will match it.
How does an APFC panel improve power factor?
The APFC relay measures the phase angle between voltage and current. When inductive load pulls the current out of phase, it switches capacitor stages in to supply that reactive power locally, so the incoming supply carries less of it.
Where are APFC panels used?
In textile mills, foundries, engineering and automobile units, food processing plants, water treatment works, and commercial buildings with heavy HVAC, lift and pump loads — anywhere induction motors and drives dominate the load.
Can APFC panels be customised?
Yes. Total kVAr, number and size of capacitor stages, APFC relay type, switching method, protection, metering, detuned reactors and enclosure dimensions are all built to your requirement.
How is APFC panel capacity selected?
Capacity in kVAr is calculated from your connected load, measured average power factor, target power factor and tariff. We strongly recommend a load measurement first — a capacitor panel sized from estimates usually ends up over-corrected or under-used.
Are APFC panels suitable for plants with variable load?
Yes — that is exactly what they are for. The relay switches stages up and down as the load changes. Where the load swings very fast, thyristor switching responds quicker than contactors.
When are detuned reactors required?
Where harmonics are significant, typically from VFDs, rectifiers and electronic loads. Detuned reactors shift the resonant frequency away from the dominant harmonics and protect the capacitors from overloading.
Do you manufacture APFC panels in Coimbatore?
Yes. Design, assembly, wiring and testing are all carried out at our works in Gandhi Maa Nagar, Peelamedu, Coimbatore, Tamil Nadu, and you are welcome to inspect the panel before dispatch.
Do you supply APFC panels across Tamil Nadu, Karnataka and Kerala?
Yes. We supply across Tamil Nadu — including Tiruppur, Erode, Salem, Karur, Madurai, Trichy and Chennai — and dispatch to Bengaluru and across Karnataka, to Kochi and across Kerala, and to projects throughout South India.
How can I request an APFC panel quotation?
Send your connected load, measured power factor and a recent electricity bill to sales@akshayamcontrols.co.in, use the enquiry form on this page, or call our engineers on +91 89403 32552.
Need an APFC Panel for Your Industrial Power System?
Send us your connected load, measured power factor and a recent electricity bill. Our engineers will size the capacitor bank and stage split, recommend whether detuned reactors are needed, and quote a panel built for your system.
Phone: +91 89403 32552
Email: sales@akshayamcontrols.co.in