230V vs 415V Air Compressors: Which Do You Need?
Choosing between single-phase and three-phase compressed air depends on supply capacity, site demand and the equipment you need to run.
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A workshop without three-phase electricity does not necessarily have to settle for a small piston compressor. Modern single-phase screw compressors can support demanding applications, provided the electrical supply and air requirements are checked carefully.
At Compressed Air Systems UK, we've helped businesses select, install and maintain compressed-air equipment since 1992. Our advice starts with the application, not simply the size of the old machine.
What is the difference between 230V and 415V?
In many UK premises, a 230V single-phase supply is available for smaller equipment and domestic-style installations. Industrial sites may have a 400/415V three-phase supply used for larger motors and production machinery.
The numbers on a machine must match its own electrical rating and installation requirements. Do not assume that a three-phase compressor can be connected to a single-phase socket or that an inverter automatically makes such a conversion possible.
Which supply is better for an air compressor?
| Consideration | 230V single-phase | 400/415V three-phase |
|---|---|---|
| Typical setting | Smaller workshops and sites without three-phase | Industrial and production premises |
| Compressor choice | Selected piston and specialist screw packages | Broad industrial screw and piston ranges |
| Electrical checks | Circuit, protection, starting demand and current rating | Phase availability, protection and installation capacity |
| Main selection factor | Available electrical capacity and required airflow | Required airflow, duty and suitable site supply |
A nominal 230V supply does not mean any single-phase machine will run from an ordinary 13A socket. Some higher-output equipment requires a dedicated circuit and suitably rated protection. A qualified electrician should verify suitability before purchase.
What if you only have single-phase power?
The PhaZair-230 variable-speed screw compressor range provides dedicated single-phase options for sites without three-phase. Example 5.5 kW models deliver approximately 27.5 CFM at 8 bar or 24 CFM at 10 bar, with floor-mounted and receiver-mounted package choices.
Airflow differs according to the pressure specified; a compressor offering more CFM at 8 bar is not automatically suitable for equipment needing 10 bar. The published PhaZair documentation identifies a dedicated 230V single-phase 40A supply for certain models, so an electrical check is essential.
Single-phase PhaZair
- 230V VSD screw option
- 8 bar and 10 bar variants
- Floor or receiver-mounted packages
- Dryer options on selected packages
Three-phase TAN-S
- 5.5, 7.5, 11 and 22 kW models
- Permanent-magnet VSD technology
- 10 bar model range
- For suitable three-phase sites
Avoid selecting a compressor from voltage alone
The supply voltage is only the first filter. Compressor sizing should be based on required free-air delivery, pressure at the point of use, tool duty cycle and expected growth. Receiver capacity and a dryer may also be needed, depending on the application.
For example, a short burst of air consumption from a workshop tool is different from continuous demand on a production line. The same peak CFM figure can lead to very different compressor choices.
- Check the equipment manufacturer’s airflow and pressure requirements
- Confirm whether air demand is intermittent or continuous
- Allow for pressure losses and sensible capacity margins
- Confirm the intended electrical supply with a competent installer
- Decide whether a receiver, dryer and filtration are required
What does Tanair recommend?
We compare the air requirement with the available electricity supply before proposing equipment. That may mean a properly sized piston unit, a single-phase PhaZair screw compressor or a three-phase Tanair TAN-S VSD. Send us your requirements and we can help narrow it down.
Frequently Asked Questions
Can I use a 230V screw compressor at a small workshop?
Yes, where a suitable dedicated electrical supply is available and the selected machine meets the air demand.
Are all 5.5 kW compressors three-phase?
No. Specialist 230V single-phase models are available, including the PhaZair-230 range.
Will a 415V compressor work on 230V?
Not by connecting it directly. Any electrical conversion or alternative equipment arrangement must be assessed by a competent specialist.
Does three-phase always mean lower energy bills?
No. Energy cost is driven by actual electrical consumption and operating hours, not the supply type alone.
Need Help With Your Compressed-Air System?
We can help you select suitable equipment, review your existing installation and understand the total cost of ownership. Speak to a UK compressed-air specialist about your application.
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