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The SP-40 is a high-capacity single-phase to three-phase rotary phase converter built for workshops and light industrial environments running very large single-motor equipment. It delivers stable, dependable three-phase power from a single-phase electrical supply, without pushing you into full-scale industrial power systems.
If you’re operating a large three-phase machine in the 20 to 25 HP range and need strong starting performance with consistent operation under load, the SP-40 is designed to handle that level of demand with confidence.
The SP-40 supports a single motor start horsepower of up to 25 HP, making it a strong fit for large lathes, mills, compressors, pumps, and other high-demand shop equipment that require substantial starting current and stable power delivery.
With a maximum capacity of 72 amps, it provides the electrical headroom needed for smooth startups and reliable operation, while remaining focused on single-machine applications rather than multi-load industrial setups.
At this level of output, efficiency still matters. The SP-40 has an idle power usage of approximately $0.28 per hour, helping keep operating costs predictable in shops where the converter may remain powered for extended periods.
It’s built to deliver serious capability without unnecessary energy waste.
The SP-40 is designed to operate on a minimum 100-amp single-phase circuit, which is typical for well-equipped workshops and light industrial facilities running large machinery.
At approximately 387 pounds, it reflects the robust construction and capacity required to support higher-horsepower equipment and is best suited for permanent installation in a dedicated shop or plant environment.
The SP-40 is intended for operators who have clearly outgrown mid-range converters and now require high starting torque, electrical stability, and dependable performance day after day.
It focuses on reliability and straightforward operation, without unnecessary complexity or overengineering.
Model: SP-40
Single motor start capacity: up to 25 HP
Maximum capacity amperage: 72 amps
Minimum single-phase circuit size: 100 amps
Idle power usage: approximately $0.28 per hour
Weight: approximately 387 lbs
Established workshops and light industrial facilities
Single three-phase machines up to 25 HP
Large lathes, mills, compressors, and pumps
Fabrication, production, and maintenance environments
Users needing high starting power and long-term stability
The SP-40 is built for operations that need serious horsepower from a single-phase supply without stepping into full industrial rotary systems. It delivers dependable performance, predictable efficiency, and a setup that aligns with real-world shop requirements.
Energy Systems Central supplies power solutions designed around how people actually work. The SP-40 reflects that approach, strong, reliable, and purpose-built for high-horsepower single-machine three-phase applications.
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Most products include a manufacturer warranty, typically starting at one year. Warranty terms vary by brand and model and are listed on each product page.
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