Representative imageACE Thyristor PFC Modules
A thyristor PFC (power-factor-correction) switching module is a solid-state alternative to electromechanical contactors for switching capacitor steps in dynamic/real-time APFC panels.
Overview
A thyristor PFC (power-factor-correction) switching module is a solid-state alternative to electromechanical contactors for switching capacitor steps in dynamic/real-time APFC panels. Contactors draw very high inrush current when energising capacitors and wear out; the thyristor module switches each capacitor at the voltage/current zero-crossing, giving transient-free, near-instant (a few milliseconds) switching, no inrush surge, silent operation and far longer service life. ACE offers two variants — Zero Current Crossing and 'ACE Precise Zero Current Crossing' — and recommends use with detuned reactors for optimum results in harmonic-rich networks. Buyers choose these modules for fast, frequent, wear-free capacitor switching in dynamic loads where contactor-based PFC cannot keep up.
Specifications
| Switching device | thyristor (back-to-back / anti-parallel), solid-state |
|---|---|
| Switching method | zero current crossing — two types: Zero Current Crossing & ACE Precise Zero Current Crossing |
| Benefit | minimises capacitor inrush current vs contactors; longer lifetime |
| Recommended pairing | use with detuned reactors for optimum results |
| Reactive power per step | typical PFC range ~10 to 100+ kVAr (class) |
| Operating voltage | 415 V class typical (230-690 V AC class range) |
| Reaction / switching time | a few milliseconds (≈5-20 ms class) |
| Operation | transient-free, surge-free, silent, maintenance-free |
| Tuned & detuned (harmonic-filter) application support | |
Applications
- Dynamic / real-time APFC (RTPFC) panels
- Rapidly varying loads (welding, cranes, presses) needing fast PF correction
- Replacing contactors in capacitor-bank switching
- Detuned harmonic-filter capacitor banks
- Industrial power-factor improvement and penalty avoidance
Frequently asked questions
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