Preen APH Series
Inductive Automatic Voltage Regulator
Where sustained, high-magnitude overload capability matters more than millisecond-level response speed, an inductive voltage regulator remains the more appropriate — and more cost-effective — choice over a solid-state alternative. Preen's APH series uses electromagnetic induction rather than a solid-state compensation circuit, trading some response speed for genuinely high overload endurance and a brushless design that reduces long-term maintenance.
This makes the APH well suited to motor industries, CNC machine installations, and general factory power conditioning — environments characterised by large inrush currents at motor start-up, sustained heavy loads, and non-linear load profiles that a lighter-duty conditioner might struggle to handle reliably over years of continuous industrial use. Overload capability reaches from 125% sustained for 40 minutes up to 200% for 5 minutes, a profile suited to absorbing genuine industrial load swings rather than brief millisecond-scale transients. Voltage regulation holds to ±2% as standard, with ±1-5% available depending on the specific application's tolerance requirement, across a 10-1000kVA three-phase power range.
The brushless inductive design is a deliberate maintenance advantage: unlike voltage regulators that rely on carbon-brush contacts (which wear and require periodic replacement), the APH's electromagnetic induction approach reduces the ongoing maintenance burden — a meaningful factor in industrial settings where unplanned downtime for equipment servicing carries a real production cost.
