5.5Kw 7.5Kw 5Hp 6Hp 7.5Hp 10Hp 50Hz 60Hz Single Phase Rotary Heavy Duty Industrial Compressor

A single phase rotary screw air compressor in 5HP/5.5kW, 6HP, 7.5HP/5.5–7.5kW and 10HP/7.5kW classes is built for workshops, garages, car wash bays, woodworking shops, small CNC rooms, tire stores, detailing studios, light fabrication and farm/industrial service points where three-phase power is unavailable. The heavy duty package combines rotary screw airend, motor, drive, aftercooler, air receiver, dryer, filtration and controller in one continuous-duty system. With 50Hz and 60Hz electrical options, the same product family can serve European, Middle Eastern, Asian, African and Australian 50Hz markets as well as North and South American 60Hz sites under correct motor and VSD specification.

Small single phase screws replace piston compressors where steady flow, low pulsation, automatic control and all-day running matter more than the lowest purchase price. For sites limited to 220V single phase, correct current sizing, starter type and tank/dryer integration decide whether the machine runs reliably or trips the panel.

Model Range And Planning Performance

Published small-screw data shows 5HP around 16–22cfm at 125psig, 7.5HP around 25–32cfm at 100–175psig and 10HP around 35–50cfm at 100–175psig, with exact FAD varying by airend, cooling and pressure. A 7.5HP/5.5kW single phase unit example lists 24cfm at 145psig, 230V/60Hz, 16.6A and 79-gallon tank. A 6HP/10HP single phase 4-in-1 example lists 15cfm/35cfm at 145psif with 40/60-gallon tanks and integrated refrigerated dryer plus precision filter. Always request factory FAD test at the working pressure, not only motor horsepower.

50Hz Vs 60Hz Single Phase Design

Grid frequency changes motor speed, cooling, torque and compressor output. A 4-pole asynchronous motor runs approximately 1500rpm at 50Hz and 1800rpm at 60Hz; a 6-pole motor runs approximately 1000rpm at 50Hz and 1200rpm at 60Hz. For screw packages this affects airend speed, delivered FAD, fan cooling and starting behavior.

A 50Hz motor placed on 60Hz supply runs faster, increases flow and power draw, reduces torque margin and can overheat or damage insulation if uncorrected. A 60Hz motor on 50Hz supply runs slower, cools less effectively and may lose starting torque. For global single phase screw compressors, specify dual-rated motor or VSD with 50/60Hz input and obtain the factory performance curve at both frequencies.

Single Phase Electrical Sizing

Single phase compressors draw higher current than equivalent three-phase machines. A 7.5HP/5.5kW 230V/60Hz screw example draws 16.6A full load, while general 7.5HP/230V single phase motors can be around 31.6A and 10HP/230V single phase around 50–55A depending on design. For 10HP single phase, many industrial guides recommend verifying panel capacity carefully and, for continuous heavy duty, evaluating three-phase conversion because single phase current and inrush become demanding.

Checklist:

• Read motor nameplate FLA, voltage, frequency, insulation class and starter type.

• Use a dedicated branch circuit; do not share with heaters, welders, EV chargers, chillers or large pumps.

• Size conductors for continuous motor load plus voltage-drop allowance on long runs.

• Use VSD or soft starter for 7.5–10HP single phase to reduce inrush, voltage sag and unloaded power.

• For fixed-speed single phase, size breaker/starter for running amps and locked-rotor starting, following local electrical code and manufacturer limits.

• Verify panel capacity before ordering 10HP single phase; 10HP+ continuous industrial duty often favors 208/230/460V three-phase instead.

• For mobile/remote sites, confirm generator output, starting kVA and VSD harmonic compatibility.

Heavy Duty Industrial Configuration

A true heavy duty single phase screw is more than a residential garage unit. For 5–10HP industrial service, specify:

Application By Power Class

5HP / 3.7–5.5kW single phase

Best for small garages, tire inflation, blow guns, light impact work, small CNC pneumatic controls, detailing and hobby/farm workshops. Expected utility air around 16–22cfm at 125psig for 5HP-class screws. Use 200–300L tank, refrigerated dryer for indoor work, desiccant branch for outdoor winter.

6HP single phase

Good intermediate class for cabinet shops, car wash auxiliary air, small blast cabinets and multi-tool benches. A 6HP/220V/60Hz 4-in-1 example delivers 15cfm at 145psig with 40-gallon tank, refrigerated dryer and precision filter. Size by simultaneous tool CFM rather than HP label.

7.5HP / 5.5kW and 7.5HP / 7.5kW labels

Two different commercial labels appear: “7.5HP” sometimes equals 5.5kW, while “7.5kW/10HP” equals 10HP. Confirm kW before quoting. A 5.5kW/7.5HP 230V/60Hz unit can deliver around 24cfm at 145psig with 79-gallon tank; 7.5kW/10HP single phase models commonly target 35–39cfm at 125–145psig with 60–80-gallon tanks. Suitable for auto repair, body shop sanding/spray support, woodworking, small laser assist, tire fleet and car wash utility.

10HP / 7.5kW single phase heavy duty

Strong all-around shop compressor: impact wrenches, DA sanders, spray guns, tire changers, small blast cabinets, CNC clamping/cleaning and car wash foam/blow-off. Market single phase 10HP screws list 35–39cfm at 125–145psig with 60-gallon tanks and integrated dryer/filter, while broader 10HP screw ranges reach 35–50cfm by airend and pressure. For continuous 10HP industrial duty on single phase, verify panel capacity; if the site can add three-phase, three-phase 10HP is usually more efficient and easier to start.

Drying And Filtration By End Use

Specify ISO 8573-1 purity class for particles, water dew point and oil. General industrial utility can accept looser classes; spray, CNC optics, food and pharma require tighter classes and documented testing.

Tank Sizing For Single Phase Screws

Single phase motors benefit from adequate storage because starting/cycling restrictions are more noticeable than on three-phase VSD systems.

• 5HP light duty: 200–300L / 60–80gal supports intermittent tools and inflation.

• 6HP cabinet/blast: 150–200L minimum; 40gal examples exist for light 4-in-1 use.

• 7.5HP/5.5kW detailing/garage: 300L / 79gal examples work for steady single-bay use.

• 7.5kW/10HP and 10HP shop: 220–300L compact, 60–80gal commercial 4-in-1 examples, larger 450L for mixed heavy tools.

• Heavy simultaneous sanding+spray+impact: oversize tank and confirm FAD, not tank alone.

Tank volume smooths demand but cannot replace insufficient screw FAD. If tools starve at working pressure, increase compressor capacity first.

VSD Vs Fixed-Speed For 5–10HP Single Phase

• Fixed-speed: lower capital, simple for steady single-shift load. Needs correct starter and breaker; single phase inrush can be high at 7.5–10HP.

• PM VSD: adjusts motor speed to pressure demand, soft-starts on single phase, reduces unloaded power, tightens pressure band and improves part-load efficiency. Best for car wash, body shop, CNC and mixed-light-industrial demand.

• Heavy duty recommendation: 5–6HP fixed or VSD by budget; 7.5HP single phase VSD preferred for indoor/commercial all-day use; 10HP single phase VSD if panel capacity is verified, otherwise three-phase fixed/VSD.

Installation And Site Layout

• Flat base with rear cooler louver clearance; enclosed screws still need airflow.

• Keep intake away from dust, soap mist, grinding dust, vehicle exhaust and abrasive media.

• Install automatic drains to oil-water separator for oil-injected condensate.

• Separate regulated branches: general tools 6–8bar, tires 7–10bar, spray/blast by equipment spec, higher only where required.

• Use proper air main size; long thin hose runs cause pressure drop and false “low compressor” complaints.

• For 50/60Hz export, label wiring diagram, voltage jumper, VSD frequency range and protection relays clearly.

Maintenance Program

Frequently Asked Questions

Can one single phase rotary screw cover 5HP to 10HP workshop tools?

Yes, but each class has different FAD. A 5HP screw may deliver around 16–22cfm at 125psig, 7.5HP around 25–32cfm and 10HP around 35–50cfm depending on pressure and airend. Count all simultaneous tool CFM, add 25–30 percent margin, then select horsepower by actual working-pressure FAD.

Is 220V single phase enough for 10HP heavy duty?

It can work with a properly sized dedicated circuit, VSD or soft starter and adequate panel capacity. A 10HP single phase load draws substantial current; many continuous industrial sites prefer three-phase 10HP for easier starting and better efficiency. Have a licensed electrician verify breaker, conductor, voltage drop and starting method.

What is the difference between 7.5HP and 7.5kW in listings?

In small screw marketing, “7.5HP” often means 5.5kW, while “7.5kW” usually means 10HP. Always confirm kW, FAD at working pressure, tank volume and electrical current before ordering.

Do I need 50Hz or 60Hz motor?

Match the destination grid. Use 50Hz motor for 50Hz countries, 60Hz motor for 60Hz countries. For export or mixed markets, specify dual-frequency motor or VSD with 50/60Hz rating; do not connect a 50Hz-only motor to 60Hz supply without factory re-rate because speed, cooling and insulation margins change.

What tank size is best for single phase 5–10HP?

Light 5HP uses 200–300L; 6HP light 4-in-1 may use 40gal/150L; 7.5HP/5.5kW examples use about 79gal/300L; 10HP 4-in-1 examples use 60gal and heavier shop systems 80–120gal. Choose larger tanks for simultaneous impacts, sanders, spray and blast.

Should the compressor include dryer and filters?

For any professional shop, yes. Refrigerated dryer removes bulk moisture; coalescing/particulate filters control oil and dust; carbon helps spray/odor-sensitive work; desiccant supports outdoor winter, humid climates and low-dew-point processes. Untreated screw air causes tool rust, spray defects, blast media clumping and frozen regulators.

Is VSD better than fixed-speed for single phase?

For variable-demand garages, car wash, body shops and CNC support, PM VSD usually saves energy, soft-starts the motor and stabilizes pressure. Fixed-speed is acceptable for steady single-shift loads if the single phase supply can handle starting current.

Can these small single phase screws run fiber laser, sandblast and car wash together?

A 5–6HP unit suits light single-task use. Car wash utility, small blast cabinets and 1–1.5kW laser assist may share 7.5HP/5.5–7.5kW depending on FAD. A 6kW fiber laser or full-size blast nozzle usually needs much more than 10HP single phase; size by laser nozzle table or blast nozzle CFM at working pressure.

How noisy are heavy duty single phase screws?

Enclosed industrial screws are quieter than open piston units, commonly around 60–70dBA depending on power, pressure, cooler fan and panel design. Request tested dB(A) at working pressure, not idle showroom numbers. VSD low-speed part-load operation further reduces fan noise.

What should I request from suppliers for quotation?

Rated FAD at each working pressure, motor kW/HP, single phase voltage and 50/60Hz rating, dual-frequency or VSD confirmation, tank volume and code, dryer type and pressure dew point, filter grades and ISO 8573-1 class, starting method and full-load/starting current, noise level, protection functions, dimensions, warranty and factory test report.

A 5.5kW/7.5kW and 5/6/7.5/10HP single phase rotary screw heavy duty compressor should be specified as one system: verified FAD at working pressure, 50Hz/60Hz-compatible motor or VSD, adequately sized receiver, refrigerated drying with desiccant option, staged coalescing/particulate/carbon filtration by ISO 8573-1 endpoint, and a dedicated single phase electrical design with soft-start or PM VSD to control current and pressure swing. This delivers continuous, dry, low-pulse compressed air for garages, car wash, woodworking, small CNC, tire fleet, light blasting and industrial service points without requiring three-phase power.