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At 100HP the question changes from "can it keep up" to "how many machines can it feed at once". A 75 kW industrial screw air compressor like the SA-100A sits at the centre of a plant and runs a header that reaches injection molding, machining, spray booths and assembly stations together. Sizing starts from the combined draw of everything that opens a valve at the same time, and this frame is the one most mid-size plants land on after outgrowing a 60HP unit.
The motor starts on a star-delta arrangement, and that detail matters at this power. A direct-on-line start at 75 kW pulls a current spike that dims the lights and trips weak breakers. Star-delta ramps the motor through a reduced-voltage stage first, then switches to full run, so the inrush stays manageable and the supply transformer is not hammered on every restart. It is a small switch that saves real trouble on the electrical side.
Heat is the other thing that grows with power. The SA-100A holds its operating temperature between 75 °C and 92 °C through a larger radiator and cooling fan, and the control panel watches oil temperature, pressure and running current together. If one of them drifts outside the set range, the machine flags it and shuts down before it becomes a failure, which is what keeps a 24-hour plant from losing a shift to an overheat trip.
The applications split along two lines. Injection molding wants long, flat pressure with no dips, because a dip mid-cycle leaves a short shot in the mould. A screw air compressor for injection molding feeds the clamp and the eject cycle on the same steady supply. Metal fabrication, spray coating, textile and automated lines want the same thing for different reasons: consistent air so the tool, the gun, the loom or the robot never waits on pressure.
A 100 hp three phase rotary screw compressor is usually delivered as a set, not a bare machine. The standard package puts a receiver of 1.0 m³, a refrigerated air dryer of 15 m³/min and a three-stage filter train after the unit, so the line gets dry, filtered air instead of whatever came out of the tank. Service runs on a fixed rhythm: routine parts every 2,000 hours and a full overhaul at 8,000, which turns maintenance from a guess into a schedule. On the electrical side, the unit draws a 100A air switch and 35 mm² copper cable as standard, with heavier cable for long runs.
A：75 kW (100 HP), 380 V three-phase 50 Hz, single-stage direct drive, air cooled, star-delta start. Working pressure is 0.8 to 1.2 MPa, and free air delivery is 12.8 m³/min at 0.8 MPa, 11.2 m³/min at 1.0 MPa, and 10.2 m³/min at 1.2 MPa. Other voltages can be built to order.
A：A 100A air switch and 35 mm² national-standard copper cable are the recommended configuration for 75 kW. For long cable runs, use heavier cable to keep voltage drop in check, and give the unit an independent supply so it does not share a breaker with other equipment.
A：It ramps the motor through a reduced-voltage stage before switching to full voltage, which keeps the startup current spike low. At 75 kW a direct-on-line start can dip the supply and trip breakers; star-delta avoids that and protects the transformer.
A：It depends on the combined air draw of everything running at the same time. At 0.8 MPa the unit delivers 12.8 m³/min, which covers a mixed load of injection molding, machining and assembly tools in most mid-size plants. Send us your machine list and we will confirm the load against the delivery figures.
A：It is designed not to. The unit holds an operating temperature between 75 °C and 92 °C on a larger radiator and cooling fan, and the controller monitors oil temperature, pressure and running current. If any value leaves the set range, the machine shuts down before an overheat becomes a failure.
A：Routine parts are replaced every 2,000 operating hours, and a full overhaul comes at 8,000 hours. The schedule is based on running hours and site conditions, so we set it against your operation when the machine is delivered, and the consumables are held in factory stock.
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Air Compressor ,
PM VSD Screw Air Compressor,
Air Tank,
Air Compressor Parts,
Air Dryer,
Precision Filter
