Generator changeover switches are vital components of power backup systems, as they ensure a safe and efficient electrical load transfer between your main power supply and the standby generator.
Depending on your switch, it can automatically or manually transfer the power. Once your main power supply is restored, the switch will transfer the power back, ensuring a seamless transition.
As you can see, a changeover switch is an integral part of your generator and prevents operational downtime in critical business and residential environments.
The components of your generator changeover switch depend on your chosen model, as some are more complex than others. However, the majority of systems include these components:
There are a few types of generator switches to choose between, and the one you select depends on your power demands and operating environment. The three main types are manual, non-automatic, and automatic.
As per the name, manual changeover switches need to be operated by activating the lever, which is located on the side of the transition switch. Once activated, the lever moves one power source to the next. In many ways, these switches are similar to railroads, as once the lever is activated, the train moves to the next tracks.
Manual systems are suitable for small businesses that don’t experience regular outages and for residential properties. However, industrial environments and industries with safety guidelines may be unable to use them as they can’t ensure an automatic transition.
In many ways, non-automatic switches are similar to manual ones, with one key difference: there’s an electronic push button mechanism instead of a lever. Some buttons are on the changeover switch, while others might be in the control room.
While these switches can be more effective in an emergency, and you can make them more accessible for employees, they still require human intervention.
Automatic Changeover Switch systems are the most advanced, with smart controllers that know when to activate them. The switch can detect outages and periods of unstable power and automatically transfer from the main supply to your backup power source.
While ATS systems are more expensive, they also offer peace of mind and ensure no downtime in environments where operations are critical, such as data centres and hospitals.
When installing a generator changeover switch, using a professional is of the utmost importance. Not only does this offer protection against potential safety hazards, but it’s also essential for commercial and industrial environments with health and safety laws.
You can use a professional installation service, and the experts will handle the entire process, including:
An expert will visit your home or business and assess your power needs. They’ll then decide which switch type is best and offer advice.
It’s essential to ensure manual switches are easy to reach, while electrical switches should have fire and weatherproof enclosures for health and safety.
Once the placement is determined, the installation team will connect the switch to your generator feed, main electricity utility supply, and output circuits. Proper grounding is essential during the wiring process as it avoids electrical faults.
All work should adhere to UK Wiring Regulations (BS 7671).
Your installation team will test the switch by simulating power cuts once the switch is connected. This ensures that the switch is working correctly. Aside from simulating a power failure, automatic switches will also be checked for alarm, timing, and failsafe functionality.
Generator changeover switches have a variety of applications, with the most common including:
Generator switches offer a variety of benefits, but it’s also essential to understand the cons. That way, you can choose the right solution for your house or company and ensure a seamless connection.
There are many things to consider when choosing a changeover switch, including the type that’s best for your business, the generator’s load capacity, and other factors:
If unsure of the changeover switch size, you can speak to a professional service that supplies national and local generator models. However, it’s also possible to work out the switch size using this formula:
For reference, residential homes typically require a switch between 40-125 A, while industrial and commercial generators often start at 160 A.
Your switch must align with the combined wattage of your devices. However, you should also add a safety margin, which means you can add more items later, without exceeding the limit and needing to purchase a new switch.
For example, if your total wattage is 5500, the minimum switch you’ll require is 24 amps. However, with a 20-25% safety margin, the switch should be 32-40 A.
You’ll often notice that changeover and transfer switches are used interchangeably, but there are some important differences to be aware of.
| Feature | Changeover Switch | Transfer Switch |
|---|---|---|
| Use | Requires manual switching between your main and backup power supply. | Usually applies to switches with automatic features. |
| Operation Type | Manual or non-automatic | Mostly automatic |
| Switching Mechanism | Rotary/mechanical or contactor-based | Mostly contactor/relay-based |
At Solent Power, we offer a range of high-quality generators and changeover switches. We’re dedicated to helping residential, commercial, and industrial clients streamline their power needs and avoid operational downtime.
With a team of expert installers and convenient maintenance services at your disposal, you can enjoy seamless power and ensure your changeover switch serves as a long-term investment.
If you’d like to discuss your needs, please get in touch with our generator sales team for a chat today. Once we understand your needs, we’ll help you find the perfect products that align with your budget.
Solent Power Ltd (Company Number 12622565) is a company registered in England and Wales. Our registered office is located at Station yard, Bowes Hill, Rowlands Castle PO9 6BP. VAT No. 363504018