Intermatic IG2240-IMSK Review

Read time: 5 minutes Last Updated: 11/19/2019

Intermatic Smart Guard IG2240-IMSK

  • Utilizes proprietary TPMOV surge protection technology in both Type 1 and 2 installations
  • Built-in module power switch allows for convenient power disconnection while replacing modules
  • Tamper-proof module door only opens when a module is inserted
  • 10-year warranty covers up to $50,000 in damages to your electronics
  • A bit challenging to install, even with included mounting kit
  • Only appropriate for smaller homes and structures
10.8 x 3.8 x 10 inches
1 or 2
Maximum Surge Current Capacity (MSCC):
10,000 amps
Enclosure Type:
Indoor, Type 1 (Metal)
Alarm or Indicator Light:
Yes 10 years
Our Review

At its core, the Intermatic Smart Guard IG2240-IMSK is (as its name suggests) part of the SmartGuard series of surge protection devices. As such, you can expect a reliable performance from this model facilitated by the latest and greatest in surge protection innovations. Case and point – this model’s use of TPMOV technology, which allows individual modules within the unit to be replaced safely and efficiently in the wake of a whole home power surge.

Speaking of modules, the Intermatic Smart Guard IG2240-IMSK makes fine use of a proprietary “iModule” system that allows even novice users manage a Type 1 or Type 2 installation with ease. This model’s built-in module power switch ensures that you’ll always be able to replace these modules with risking a painful shock, while its tamper-proof module doors are set up such that they will only open when an “iModule” is being inserted.

Looping back to this module’s simplified installation, novice DIYers won’t need to spend hours scratching their head about what tools they’ll need to mount the Intermatic Smart Guard IG2240-IMSK. That’s because this module comes pre-packaged with a full mounting kit, free of added charge. Just be sure to measure out your installation space carefully, though, because previous users have found that this model’s door may not close correctly if the body is not attached with precision.

Finally, the added value of the Intermatic Smart Guard IG2240-IMSK is among the very best in its class right now. While the full package tends to run around $200, prospective users that decide to go with the Intermatic Smart Guard IG2240-IMSK will also receive a 10-year warranty for both the unit itself and any important electronic appliance that is attached to it. Should a power surge seize your home and cause this otherwise reliable unit to fail, Intermatic will provide you an opportunity to replace the full value of your in-home appliances for up to a decade post-purchase.

Read more about our how our ratings broke down for the IG2240-IMSK below or checkout how it compares to other whole surge protectors.

Key Specification Ratings

Maximum Continuous Operating Voltage (MCOV) – 8/10

Why Did It Earn this Score? – Despite its appearance, the Intermatic Smart Guard IG2240-IMSK is a fairly lightweight unit in terms of surge suppression capabilities. As such, it’s fairly respectable that this model manages to provide industry-standard MCOVs across its four modes of protection. Whether you need a 150-volt MCOV (L-N and N-G) or a 300-volt MCOV (L-G and L-L), this model has you covered.

Voltage Protective Rating (VPR) – 8.5/10

 Why Did It Earn this Score? – Because some of Intermatic’s previous models have dropped the ball on this front, we are glad to see that the engineers that designed the Smart Guard IG2240-IMSK did so with differentiated VPRs in mind. 3 out of the 4 protection modes featured on this model include unique VPRs at 700 (N-G), 800 (L-N), and 1,500 volts (L-L and L-G), respectively. As such, this surge protector can really shine when it is being installed by a seasoned user with prior experience managing the volume of electricity transmitted to a home during a surge event.

Mode of Protection – 8.5/10

Why Did It Earn this Score? – Simply put, we couldn’t be more pleased to see a popular model from Intermatic providing all four major modes of protection in a single package. Should you need them, the Intermatic Smart Guard IG2240-IMSK will place L-G, L-L, L-N, and N-G modes all at your disposal. Each of these differentiated modes comes with a different MCOV and VPR as well, allowing you to more efficiently manage your home’s surge protection without needing to install multiple units.

Comparing the Intermatic Smart Guard IG2240-IMSK and the Intermatic IG1240RC3

While flipping through Intermatic’s catalog of current surge protection devices, you may notice that the Intermatic Smart Guard IG2240-IMSK and the Intermatic IG1240RC3 are often listed beside one another. Accordingly, these two models often receive direct comparisons, even though they are noticeably different, both aesthetically and in terms of their performance.

First off, the Intermatic Smart Guard IG2240-IMSK resembles a traditional switch box, both in appearance and in function. The unit itself houses three specialized modules, each of which acts independently but possesses the combined ability to suppress up to 10,000 amps in surge electricity. Each of these modules is designed to be replaced, which in turn allows this model’s TPMOV surge protection technology to meet its full potential time and again.

The Intermatic IG1240RC3, on the other hand, is a standalone unit that is installed beside a traditional fuse box and is capable of managing a whopping 100,000 amps of surge electricity. The Intermatic IG1240RC3 was also engineered for outdoor installations, primarily based on its utilization of a type 3R rainproof enclosure. Even in terms of value, this model’s price tag around $100 makes it more affordable for folks who are willing to accept its diminished 5-year warranty.

Between the two options, the Intermatic IG1240RC3 is the far better option for folks with larger homes or a greater volume of important electronic devices across their home. On the other hand, folks with smaller living spaces may opt for the Intermatic Smart Guard IG2240-IMSK, particularly if they live in an area prone to lightning during rainy seasons.

The Final Verdict

After digging through its features and its specifications, we can conclusively endorse the Intermatic Smart Guard IG2240-IMSK for use in protecting your whole home from electrical surges. While this model’s maximum surge protection capacity is fairly modest, folks who expect to use their new unit for a decade or more will be impressed to see this model’s use of a durable metal enclosure and its inclusion of a 10-year warranty.

Better yet, the Intermatic Smart Guard IG2240-IMSK innovates on the surge suppression technologies used throughout the industry over the past several decades. As such, you’ll be able to count on this module’s modular use of TPMOV surge protection technology to far exceed your performance expectations, regardless of its implementation in Type 1 or Type 2 installation.