UNIMAC ACM-500s Quiet Air Series 50L 3.0HP Silent Oil-Free Electric Air Compressor

Product Overview

The UNIMAC ACM-500s is built for buyers who want serious compressed air performance without the noise, servicing, and mess that can come with traditional oil-lubricated or belt-driven setups.
With its 50L tank, quiet oil-free design, and strong 3.0HP output, it is designed to suit garages, sheds, workshops, and demanding home or trade-style jobs where reliable air supply matters.

Why This Air Compressor Stands Out

What makes the ACM-500s especially appealing is the way it combines useful tank capacity and airflow with quieter, lower-maintenance operation.
It is not just about storing more air. It is also about making regular workshop use easier, cleaner, and more convenient.

Powerful Dual-Motor 3.0HP Setup

At the heart of the ACM-500s are two twin-cylinder 1.1kW motors delivering a combined 3.0HP output.
That gives the compressor the kind of performance many buyers want for repeated air tool use, inflation work, and general workshop tasks where a smaller unit can start to feel underpowered.

50L Tank for Longer Working Time

The 50 litre receiver is one of the most practical advantages of this model.
It gives you a useful reserve of compressed air, which helps keep work moving smoothly and reduces stop-start interruptions on longer jobs.

200L/min Free Air Delivery

With a listed free air delivery of 200L/min at 7 bar, the ACM-500s is built to support a broad range of workshop and garage uses.
That makes it a practical option for buyers who want more than a light-duty inflation-only compressor.

116 PSI Working Pressure

The ACM-500s runs at a working pressure of 116 PSI, with a restart pressure of 86 PSI.
That gives it practical operating pressure for many common compressed-air tasks while helping the compressor cycle efficiently during use.

Quiet by Compressor Standards

A major selling point here is the quiet-air design.
UNIMAC states an Lpa of only 64 dBa, which makes this compressor especially appealing for buyers who want strong performance without the harsh noise often associated with workshop compressors.

Oil-Free, Service-Friendly Design

One of the strongest practical benefits of this model is its oil-free setup.
You do not need to worry about engine maintenance, oil changes, or replacing belts and pulleys, which helps make ownership simpler over time.

Twin Nitto Quick-Connect Outlets

The twin Nitto outlets add useful flexibility because they make it easier to connect a wider range of tools and accessories.
That gives the compressor more practical appeal for buyers who want a versatile, ready-for-work setup.

Automatic Pressure Control

UNIMAC includes an automatic pressure control switch to help maximise motor efficiency and make operation easier.
This is one of those features that adds real convenience in day-to-day use.

Easy-to-Read Gauges

The precise tank pressure and line pressure gauges help take the guesswork out of setup and use.
That makes the ACM-500s easier to manage when switching between different tools and air requirements.

Portable Workshop-Friendly Design

Even with its solid 50L tank, the ACM-500s is designed to remain portable.
Two large easy-roll wheels, rubber anti-skid feet, an extended handle, and a grab handle all help make it easier to move around the shed, garage, or workshop.

Built for a Wide Range of Tasks

The listing positions this compressor as suitable for a huge variety of applications.
It is a practical choice for buyers wanting one larger-capacity unit that can cover inflating, spraying, cleaning, and many general air-powered workshop jobs.

Key Specifications

• Brand: Unimac
• Model: ACM-500s Quiet Air Series
• SKU: TOLACMUM5C0FA
• Product type: Air Compressor
• Power type: Corded Electric
• Input voltage: 240V AC
• Motor input: 230-240V 50Hz
• Power plug: 10A Australian Standard
• Power rating: 2.2kW (2 x 1.1kW), 3.0HP
• Free air delivery: 200L/min (7.0 CFM)
• Air displacement: 420L/min
• Working pressure: 116 PSI
• Restart pressure: 86 PSI
• Receiver capacity: 50L
• IP rating: IP20
• Starting system: Automatic Pressure Control Switch

Highlights at a Glance

• Quiet Air Series design with low 64 dBa noise output
• 50L air tank capacity for longer uninterrupted work
• 2 x 1.1kW motors delivering 3.0HP total output
• Impressive air displacement of 420L/min
• Free air delivery of 200L/min at 7 bar
• Working pressure of 116 PSI and restart pressure of 86 PSI
• Oil-free compressor motor for simpler maintenance
• Twin Nitto quick-connect outlets
• Automatic pressure control for smoother operation
• Easy-to-read tank and line pressure gauges
• Portable design with large easy-roll wheels and extended handle
• Rubber anti-skid feet for stable placement

What’s in the Box

• 1 x Unimac ACM500s Air Compressor
• 4 x Air Filters
• 1 x Handle
• 1 x User’s Manual Flyer
• Note: User manual is accessible online.
• Note: Minimal assembly required.

Size and Weight

• Product dimensions (W x L x H): 35 x 80 x 70cm
• Product weight: 41kg
• Carton dimensions (L x W x H): 76 x 33 x 68cm
• Gross weight: 46kg

Who It Suits

This air compressor is a strong fit for workshop users, serious DIY buyers, and garage owners who want a quieter electric unit for regular compressed-air work.
It makes especially good sense for buyers who want a useful balance of tank capacity, airflow, portability, and lower maintenance.

Final Thoughts

The UNIMAC ACM-500s comes across as a practical and well-rounded electric air compressor with a strong mix of quieter running, useful air delivery, and everyday workshop usability.
With its 50L tank, dual-motor 3.0HP setup, twin Nitto outlets, easy-roll portability, and oil-free design, it is a smart option for buyers who want capable compressed air without extra fuss.

More Information