Here’s the thing – while big nationwide blackouts don’t happen that often, power cuts can strike anywhere, anytime. Crazy storms, equipment failures, you name it.

So, get yourself a backup generator. These machines kick in automatically when the power goes kaput, instantly restoring your lights, heating/cooling, electronics, you name it. Goodbye, major disruptions and headaches!

Not only that, but generators also keep critical systems like sump pumps and security alarms running during an outage. That means no flood damage or break-ins while the power’s out. Double win!

Still on the fence? This guide has all the deets you need on getting a generator set up to protect your UK home or business:

Automatic Transfer Switch

When the primary source fails, an automatic transfer switch switches electricity from that source to the backup source. It then automatically transfers back once the main power has been restored. ATSs are required for all standby generators and are available for use with larger portable units.

Some key advantages of automatic transfer switches include:

– Hands-off operation – no need for manual intervention

– Seamless power transitions in just seconds

– Advanced monitoring/controls available

– Reduced risk of dangerous back feeding onto power lines

Manual Transfer Switches

A manual transfer switch requires someone to be physically present to manually transition the power load from the utility to the generator upon an outage occurring. An electrically operated transfer switch still needs to be manually engaged. This affordable switch type is commonly used with portable generators and smaller residential standby units.

While convenient ATSs are preferable, manual transfer switches still offer key benefits:

– Lower installation costs vs automatic models

– Compact, space-saving designs

– Simple operation (just flip a switch)

– Safety features like GFCI protection

Manual Changeover Switches Explained

Manual transfer switches are also referred to as “manual changeover switches.” This is simply referring to their operation of manually changing over the power supply from the mains to the generator source.

A manual changeover (or transfer) switch contains an interlock mechanism that prevents your generator from potentially back feeding electricity onto the grid and creating a serious safety hazard. With the switch in the “Utility” position, your property receives power exclusively from the utility company’s electrical supply. Flipping the switch to the “Generator” position disconnects the utility connection while simultaneously connecting your generator’s electrical output.

Modern manual changeover switches can detect phase errors and will not complete the transfer if phases don’t match up properly. They also build safety features like overload protection, voltage/frequency monitoring, and grounding assurance to safeguard your equipment.

While more affordable than ATSs, manual changeover switches do require a responsible party to be present and take action when outages occur. You’ll need to manually start the generator, let it build up to full output, and then manually transfer the supply once ready. The same sequence in reverse is needed when utility power is restored.

Common Applications for Changeover Switches

Manual changeover switches see wide usage across many residential and industrial settings where standby power requirements are more modest and there is personnel available to monitor/control generator operation.

Some common applications include:

– Residential homes

– Apartment/multi-family complexes

– Shops and small businesses

– Agricultural/farm operations

– Construction sites

– Backup lighting and signage

– Water treatment facilities

– Remote telecom sites

Both portable generators and smaller standby units under 20kW often utilize manual transfer switches. These compact, budget-friendly switches get the job done without complexity for applications that don’t require a fully automated system.

Installation & Sizing Considerations

It’s critical to properly size your generator and manual changeover switch to handle the electrical loads you want to power. Overloading a generator can damage the unit itself, your connected equipment, and even create safety risks.

A professional generator supplier will be able to calculate your load requirements and recommend appropriately sized generators and transfer switches. Some general guidelines:

– Calculate the total running wattage of items you’ll need to power simultaneously

– Choose a generator with at least 25% more rated output than your expected load

– Gas generators are sized by running watts; diesel models by kVA output

– Most residential applications can be covered by generators from 7-22kW

– Light commercial or backup purposes may need generators in the 25-150 kW range

For manual changeover switches, important factors include:

– Load rating in amps – must meet or exceed generator’s rated amperage

– Cable entry ports need to be sized for your incoming cables/conduits

– NEMA enclosure rating should match your environmental conditions

– Consider options like meters, cam locks, powder coating and more

Purchasing New Generators for Sale UK

Top generator brands in the UK include:

– Generac

– Cummins

– Kohler

– Briggs & Stratton

– Pramac

– Hyundai

– And many more…

Respected power equipment suppliers offer comprehensive support for new generators for sale in the UK – residential, industrial, healthcare, data centres, events, and more. Many have extensive hire fleets for temporary power needs as well.

It’s best to consult with generator experts to guide you through the product selection, sizing, installation and ongoing maintenance processes. With a properly specified generator and manual changeover switch in place, you can have peace of mind knowing your power needs will be covered during any utility outage.

So there you have an overview of new generators for sale in the UK, covering the key differences between standby and portable units, automatic vs manual changeover switches, installation guidelines, and more. With this information in hand, you’ll be well prepared to make an informed decision about equipping your home or business with backup generator power.