A 40HP compressor sits in a gap that most suppliers leave open. Workshops that outgrow a 30HP machine often buy a 50HP one instead, then pay for capacity they never use and burn extra power every hour the bigger motor runs unloaded. This 30kW direct drive screw type air compressor delivers 5.0 m³/min, about 175 CFM, at 0.8 MPa. That is the output most mid-sized shops actually need, and it comes without the price step up to 50HP.

The frame is the same one used on the 50HP model: 1500 × 1000 × 1350 mm. That is deliberate. A shell sized for a larger machine leaves more room around the air end and the motor, so service work does not turn into a puzzle of removing panels to reach a filter. Airflow through the cabinet has more space to move, and the machine runs cooler on long shifts. If the shop adds equipment later and needs to step up to 50HP, the foundation, the piping and the floor space already fit.

Drive is direct. The motor couples straight to the screw element with no belts to tension and no gearbox to service. Fewer parts between the motor and the rotors means fewer things to check on a maintenance round. The motor runs at one fixed speed and the machine loads and unloads against tank pressure through a pressure switch, so there is no inverter to configure and no speed band to tune. For a plant whose air demand stays roughly level through the shift, that simplicity is the point: lower purchase cost, fewer failure points, and a control panel the operator learns in an afternoon.

What 5.0 m³/min covers in practice depends on how the air is used. In an assembly shop it is enough for a line of pneumatic tools running in rotation. In a fabrication shop it can carry a set of smaller CNC machines plus blow-off stations and spray work. The figure to watch is simultaneous demand, not the total count of tools on the floor. If a shop runs many tools at the same moment, or plans to add a second shift with more equipment, stepping up a frame makes more sense than pushing this one.

A medium size air compressor on a workshop floor still needs the same treatment as a large installation. Set it on a level, hard floor, leave clearance on every side for airflow and access, and size the supply cable and breaker to the motor rather than to the socket that happens to be nearby. Pairing the unit with a properly sized air receiver tank and a refrigerated air dryer keeps the air dry and evens out pressure swings, which protects the tools downstream. Because it is supplied as a standalone 175 CFM air compressor, the receiver, the dryer and the service parts are matched to your line instead of being bundled at a fixed size.

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FAQ

Q1: What are the rated specifications of the SA-40A?

A:30 kW (40 HP) single-stage fixed speed screw compressor, 380 V / 50 Hz three-phase, 5.0 m³/min free air delivery at a working pressure of 0.8 MPa (8 bar). Overall dimensions are 1500 × 1000 × 1350 mm.

Q2: Should I take the 40HP or the 50HP model?

A:Start from simultaneous air demand. The SA-40A delivers 5.0 m³/min; the 50HP SA-50A delivers 6.3 m³/min at the same pressure. If your tools rarely run at once and the current load sits comfortably under 5 m³/min, the 40HP does the job with a lower purchase price and a smaller motor to feed. If you run many tools together, or you know a second shift is coming, the 50HP leaves room to grow. Measuring actual consumption on a normal shift answers this faster than any rule of thumb.

Q3: How much floor space does it need?

A:The machine itself is 1500 × 1000 × 1350 mm. Leave clearance on all four sides for airflow and for reaching service points, and keep the unit out of a sealed corner where heat has nowhere to go. Allow extra room if a receiver and dryer sit beside it.

Q4: Why does a 40HP machine use a 50HP cabinet?

A:Because the larger enclosure works in your favour. There is more space around the air end and motor for service access, airflow through the cabinet is less restricted, and the machine runs cooler over long shifts. It also means that if you later replace it with a 50HP unit, the foundation, piping and floor space stay exactly as they are.

Q5: What kind of plants is this model suited to?

A:Shops with steady air demand through the shift: assembly lines, fabrication and metalwork, woodworking, packaging, and general maintenance workshops that have outgrown a 30HP machine but do not need 50HP capacity. It suits plants where demand does not swing sharply, since a fixed speed machine loads and unloads rather than matching output to demand the way a variable speed drive does.

Q6: What maintenance does the SA-40A need?

A:Routine attention goes to the air filter, the oil filter, the separator element and the lubricant, replaced on the schedule in the manual. Daily checks are the oil level and the machine's own readout of pressure and temperature. The direct drive layout means there are no belts to tension and no gearbox oil to change, which keeps the list short.