Intermatic IG1240RC3 Review

Intermatic IG1240RC3 In this Intermatic IG1240RC3 review, we’re going to look at all the important things you need to know about this surge protector.


The Intermatic IG1240RC3 surge protector is categorized as a type 2 device. Let me explain. This category of SPD are installed on the load side of the primary service entrance and their job is to protect the electrical service entrance or branch circuit against lightning, surges caused by motors, and other voltage spikes.

A type 2 surge protection device can protect your sensitive electronics by clamping down on transient voltage (short surges). They can be used in an industrial, commercial or residential setting but majority of the reviews over the internet revealed so far that the Intermatic IG1240RC3 is successfully used in residential areas.

According to the manufacturer, you can also use this SPD as a type 1 device. A type 1 is also known as secondary surge arresters and they are typically installed on the line side of the main service entrance which is between your power pole and where electricity enters your panel.

Their basic purpose of a type 1 SPD is to protect you from surges that are happening outside your house such as lightning strikes and other external fluctuations. You can think of them as your first line of defense against surges.

Intermatic IG1240RC3 Installation

This Intermatic surge protector is designed for 120/240 VAC single (split) phase and you can install it using a 15A or 20A 2-pole breaker. If you have 2 single pole breakers then you can also use it for this SPD.

The National Electrical Manufacturers Association (NEMA) gave this Intermatic SPD a type-3 rating enclosure which basically means that it will perform at its best even when you install it outdoors.

On average it takes about 20 minutes to install if you have some experience. Having your tools ready will lessen the installation time.

This unit has a 4-wire hookup. You will need 2 spaces in your breaker panel for a 2-pole, 20A circuit breaker and two available terminals on the ground bus bar.

If you have some background in doing electrical work, installing the Intermatic IG1240RC3 is going to be an easy job. However, it’s recommended that you call your local electrician or someone who knows what they’re doing if you’re not comfortable working with your breaker panel.

If you insist on installing it yourself, try to wear some very thick rubber gloves. But I would still highly recommend that you call your local electrician in order to ensure maximum safety.

The instructions are just going to be a basic diagram and again this is easily understandable for someone with experience. But it would be a very good improvement if the documentation was presented in a more organized manner.

The device is fairly large so you have to make sure that you have enough room in your breaker panel. The length of the wires is 6 inches long and the material is made from tinned copper. The wires are not made up of aluminum so you do not need to worry about the wires getting oxidized.

Levels of Surge Protection

The Intermatic IG1240RC3 will give you 6 levels of protection and they are protection between:

  • Line 1 and Line 2
  • Line 1 to Neutral
  • Line 1 to Ground
  • Line 2 to Neutral
  • Line 2 to Ground, and
  • Neutral to Ground

Once you’ve installed this whole house surge protector, a bright green LED will light up. This means that the unit is functioning and is now ready to suppress any transient voltage that will enter your house. If you’ve experienced any surges and noticed that the green LED went out, then it means that the Intermatic surge protector took a bullet for your appliance and needs to be replaced.

Consumer Reviews

There are consumers who have been sharing their experience with the Intermatic IG1240RC3 online. Some of them were living in an area where lightning frequently strikes and they were pleased with how the Intermatic surge suppressor saved their sensitive electronics.

Some of them found it hard to give a review because the unit doesn’t really do anything until a surge or a lightning strike happens.

Installing the unit was a pretty simple job for some of the consumers but a few of them did call up their local electrician.


If you go to the manufacturer’s website and compare the Intermatic IG1240RC3 to their other models, you will learn that this particular surge protector is the in-between model when it comes to price and its level of protection.

The cheaper models will only provide a 3-way surge protection and like you’ve read earlier, this model gives you 6 levels of protection. The more expensive ones will have some additional protection for your phone and cable TV.

Warranty for Intermatic IG1240RC3

This Intermatic surge suppressor is under a 5-year warranty and they provide a $10,000 insurance policy for any damage. So make sure that you register for that and save your receipt in you case you need to file a warranty claim.

You won’t find this warranty information clearly stated over at its product page. What you need to do is contact Intermatic through their website to request for a copy of the warranty.

Help and Support?

If you visit the Intermatic website and go to the support section, you’ll see written on their site that they’re dedicated in providing help and support that exceeds their customers’ expectations.

It seems that Intermatic is really serious in providing a high quality of customer support based on consumers’ feedback.

There were some consumers who had a pleasant experience with regards to claiming their warranties for the Intermatic IG1240RC3. Most of the time, the process was really straightforward as you just make a call, fill out a form, and you will get a new Intermatic surge protector in as little as a week.

What’s Next?

Hopefully this review will help you make an informed decision with this type-2 SPD. Do you have any experience with this device? I would love to hear what you think. Thanks for checking this review out.

Leave a Comment