5 Best Generator Transfer Switches

Generators are essential to us. Be that at home or our businesses, generators are the emergency storage of power that we might need when the time comes.

However, when some people buy a generator, they might not realise they need some added extras which are as vital as the generator itself. One of these imperative items is a generator transfer switch. If only it were that simple to just find a switch and buy one right away!

Some of you know what a generator transfer switch is - but what you might not know is which one to buy. There are so many different types available, it’s like a sea of confusion - you need help! 

So, for those of you who need to know where to look and what to get - we got you. For those who are thinking of getting a generator but have no idea what a transfer switch is - we got you too.

So, let’s spark it off. What are the five best generator transfer switches and what do I need to know?

Best Generator Transfer Switches Buying Guide

Portable Or Standby Generator?

Okay, before we go any further - you can’t go buying a switch without knowing which generator you have. It’s important that you choose the right switch for your generator.

It’s more common for people to have standby generators, particularly when looking to buy a transfer switch - so let’s explore the types of switches available. 

The Types Of Standby Generator Transfer Switch

There are three main types of generator transfer switch:

• Whole home 
• Generator sub-panel
• Load center automatic transfer 

It’s important that we know the difference between these when purchasing a switch too. 

Whole Home 

The installation of this type of switch is done somewhere between your main panel and utility meter.

When there’s a blackout, this switch will disconnect the flow of power from the main source and re-route it to the generator. Usually, it will be flowing properly in under a minute, so you shouldn’t be in any real panic for power. 

If the switch is service entrance rated, it means the switch will work as the first disconnect for your utility service and will involve a circuit breaker. 

If your switch comes with power management, it means that a switch can manage the power to avoid overloading the generator and “flipping the switch.” Basically it can manage how much power is being used so you don’t end up losing power entirely! 

It will normally give priority to things with the need for more power, such as refrigerators and freezers. 

Generator Sub-Panel 

This is fitted right in the main panel. During any power outage, it will disconnect from the mains and heads to the generator. 

Load Center Automatic Transfer 

This effectively swaps your main power panel. The circuit breaker will act as a disconnect and then the mechanism will connect to the meter plus the generator.

If you’ve recently moved into a new house, it’s a good choice as it doesn’t need extra wiring and can work well with newly designed houses. The older the house is, the more scarce the utility services. 

Those are your types of main switch. However, there are further things to consider. 

NEMA Ratings 

You may have seen when looking for an automatic switch, that the description might contain a NEMA rating. This is crucial for knowing where your switch can be installed:

NEMA 1: Requires dry areas and must be inside. They can handle the sporadic drop of water or accidental spillage to an extent - but are absolutely useless in heavy rain or snow. 

NEMA 3: You can have indoor or outdoor. Normally weather resistant, the product is usually durable and designed in such a way to keep the elements out of harm’s way. 

Do I Need Automatic Or Manual?

Automatic switches mean you don’t need to go outside and deal with the power outage, or if you’re indoors - you don’t need to move from your seat!

However, automatic switches are generally far more expensive. Generally, manual switches are easier to install but automatic switches have the ability to be programmed for certain scenarios.

Depending on what you need the generator for, you’d need to think about this. For your home or business - it is far better to get an automatic. 

What’s The Deal With Watts?

You will absolutely need to check this when buying a switch. You’ll need to work out what you’re going to be powering and how many watts will be powered using the generator. If you’re unsure, you should speak with the generator supplier. 

I’ve Read Transfer Switch Kit - Do I Need A Kit? 

If you can buy an entire kit, this will simply speed up the process of installing the switch.

You’ll normally find when buying a switch that it is part of a kit, but you should definitely double check that. Nothing worse than waiting longer for no reason! 

What Are The Certifications?

If you see UL or CUL, you can rest assured that the product has been safety tested. If you’re buying a well-known manufacturer’s product, it should almost always have these certifications.

It is a case of getting what you pay for sometimes. The reliable product will normally come from the reputable manufacturer but may cost slightly more. 

Frequently Asked Questions

What Is A Generator Transfer Switch?

In essence, a generator transfer switch is a permanent fixture that connects to a power source - in this case a generator. It alters its power between two sources.

If your normal source of power goes down, the transfer switch will automatically swap the power source - making it an ideal bit of kit to keep your power going. This is perhaps more essential if you’re running a business.

For your home, the switch will have the generator plugged into it from the circuit panel. When the generator is activated, the switch will alter the power source from the usual grid to the generator.

Do All Generators Need A Transfer Switch?

Any standby generator will more than likely need a transfer switch. It is constantly “on pause” until your power goes down. This will happen at some point, and more frequently depending on where you live - so it’s crucial to have this so your power can continue until the main source of power is back. 

At home, this is a helpful tool to have. You’ll find it much easier and tidier to power stuff up from a circuit breaker than having to deal with a load of wires and extension cords.

Is It A Requirement To Have A Transfer Switch Though?

Okay, so we’re thinking here about health and safety and any legal requirements. For safety - if your generator goes from 5000 watts or above, you will need a transfer switch. This level of power will require some sort of regulator. 

In some places, it is a strict legal requirement to have a transfer switch, whereas other areas simply suggest that you have one. It’s best to check this with your authority or building code offices. Even better though is just to have one. 

Are There Any Risks For Not Having A Transfer Switch?

Yes, yes and yes again. For a standby generator -  your safety, your family’s safety or your work environment and employees safety is at risk.

Without a good regulator of power in a transfer switch, your power could end up going haywire with two currents flowing to your home or business. 

This can lead to fires or fatalities with the power workers on the line. Portable generators will not see these issues though. 

Are There Different Switches?

Yes, there are two main kinds. The first is automatic, which will automatically switch the power when required. The other is manual which needs someone to flip the lever (most portable generators have this.) 

It’s of course, far better to have an automatic transfer switch in cases of poor weather conditions or awkward landscapes etc. 

Can I Just Install The Switch Or Do I Need To Call Someone?

Are you qualified? If not, please don’t try and put it in yourself. It’s highly recommended that you call a professional. If you’re unsure who to contact, speak with the generator supplier or utilise social media in your area. 

Is There A Permit I Need To Apply For?

Almost always, yes. However, if you’ve hired a professional - they will likely have done this part on your behalf and charge you in the bill accordingly. Again, if you’re unsure what’s happening - speak with your local authority. 

Of course there are probably other questions you have - we’ve got you covered there too.

Now that you’ve understood the basics of a generator transfer switch, you might be considering buying one? Well, have a read below of our buyers guide.

To Conclude 

When you’ve finally decided if you’re going to buy a generator transfer switch, you should have considered the following: 

• What will I need to power? This is for your wattage and is crucial. It will also determine if you’re going to need an automatic or manual and more than likely answer if you need an indoor or outdoor switch. 
• Am I going to install it or do I need to call someone? As we’ve said, it is extremely recommended that you contact a professional if you have no experience in doing this. Any error can cause fires, injury or at least extra costs. 
• Am I buying from a reputable seller? Ensure that you’re not buying something just because it’s cheaper. You cannot put a price on safety and it is always recommended that you pay the extra to protect your home, business and family. 

We hope that you now have all the information that you need to go forward and make an informed decision on your generator transfer switch. If you’ve already made a decision - great! More power to you!