Capacitor Bank Price in Sri Lanka – Power Factor Correction from India
Capacitor Bank Price in Sri Lanka – Siemens SIECAP from India
A capacitor bank is a grouped assembly of individual power factor correction capacitors connected in parallel to supply reactive power (kVAr) to an electrical installation. When motors, transformers, fluorescent lighting ballasts, and other inductive loads draw reactive current from the supply — current that performs no useful work but still flows through cables, transformers, and switchgear — the installation’s power factor falls below unity (1.0) and the utility charges a penalty for low power factor or bills on apparent demand (kVA) rather than active demand (kW). Installing a capacitor bank locally supplies the reactive current from the capacitors instead of drawing it from the grid, improving power factor toward unity, reducing the apparent kVA demand, eliminating reactive power penalties, and reducing voltage drop in distribution cables. For Sri Lanka’s CEB and LECO commercial and industrial consumers billed on maximum demand tariffs, a well-designed APFC (Automatic Power Factor Correction) panel with correctly rated capacitors can reduce monthly electricity bills by 10–25%.
MyElectric.in stocks the Siemens SIECAP 4RB2 series of MPP (Metallised Polypropylene) cylindrical capacitors — available in Normal Duty and Heavy Duty ratings across 440V, 480V, and 525V voltage classes, from 6.3kVAr to 33.1kVAr per unit. These are the individual capacitor units that are assembled into APFC panels alongside cap-duty contactors and an APFC controller.
Siemens SIECAP 4RB2 — Normal Duty Capacitors (440V)
Normal Duty capacitors are rated for networks with low harmonic distortion (THD <8%). The 440V version is suitable for standard three-phase industrial installations in Sri Lanka where the supply is 415V ±6%:
| SKU | kVAr | Voltage | Type |
|---|---|---|---|
| 4RB2200-3EE52-8K | 20 kVAr | 440V AC | Normal Duty |
Siemens SIECAP 4RB2 — Heavy Duty Capacitors (480V & 525V)
Heavy Duty capacitors are rated for networks with higher harmonic distortion (THD up to 15%) and surge environments. The 480V and 525V voltage ratings provide an adequate safety margin for 415V systems with voltage surge or where detuned reactor networks are used (the reactor raises the capacitor’s effective voltage). Heavy Duty capacitors use reinforced dielectric film and have higher current capability for switching inrush:
| SKU | kVAr | Voltage |
|---|---|---|
| 4RB2063-3EJ53-8K | 6.3 kVAr | 480V |
| 4RB2110-3EJ53-8K | 11 kVAr | 480V |
| 4RB2250-3EJ53-8K | 25 kVAr | 480V |
| 4RB2281-3EJ53-8K | 28.1 kVAr | 480V |
| 4RB2063-3FC53-8K | 6.3 kVAr | 525V |
| 4RB2132-3FC53-8K | 13.2 kVAr | 525V |
| 4RB2200-3FC53-8K | 20 kVAr | 525V |
| 4RB233-1FC53-8K | 33.1 kVAr | 525V |
Choosing the Right Capacitor Voltage Rating
For direct connection to a 415V three-phase bus without series reactor: use the 440V Normal Duty (4RB2200-3EE52-8K) if harmonics are low, or 480V Heavy Duty for networks with VFD and UPS loads. For detuned networks with series reactors (7% p or 14% p), the reactor causes voltage rise across the capacitor — use 525V Heavy Duty capacitors to maintain adequate voltage margin. Most modern APFC panels for Sri Lanka’s commercial and industrial premises use detuned reactors with 525V capacitors to handle the harmonic pollution from VFDs, UPS systems, and electronic ballasts.
For complete APFC panels with controller and cap-duty contactors, see our APFC page. For the cap-duty contactors that switch these capacitors, see our Cap Duty Contactor page.
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