With the IG2240-IMSK, Intermatic’s surge protection devices (like its SmartGuard devices) are at the heart of surge protection. This model offers reliable performance as a result of its surge protection innovations. The TPMOV technology is applied to this model, which makes it possible to replace individual modules irrespective of whether a power surge impacts the whole house.

A proprietary system has been proven to be easy to use by both professionals and novice users. Intermatic Smart Guard IG2240-IMSK runs on iModule.

As well as the module power switch built into this model, this model features tamper-proof doors that can only be opened using the “iModule”.

Thanks to its simplified installation process, Intermatic Smart Guard IG2240-IMSK is easy to install even by novices. There is no charge for this module since it comes pre-installed with the kit.

You may not be able to close the door on this model if you do not attach the body carefully. If you want to install something, though, make sure you measure it carefully.

With an added value of 1,755, the Intermatic Smart Guard IG2240-IMSK is two times the average value of products in its class.

Users can also get a 10-year warranty for the device itself and any electronic appliances connected to the Intermatic Smart Guard IG2240-IMSK despite the device’s price is around $200. Our electrical surge replacement service covers up to ten years of outages resulting from electrical surges in your home.

Intermatic Smart Guard IG2240-IMSK Review 2023

Voltage Maximum Sustained

Its appearance belies its modest power consumption when it comes to surge suppression. In that case, it’s quite impressive that the model manages to provide MCOVs that are industry-standard across all four modes of protection. The model is suitable for MCOVs up to 150 volts (L-N and N-G) and up to 300 volts (L-G and L-L).

Protective Voltage

The engineers at Intermatic, who developed the Smart Guard IG2240-IMSK, obviously designed it with differentiated video protection in mind, since some of their previous models fell short in this area. The PSX-300 includes 3 unique protection modes: N-G (700 volts), L-N (800 volts), and L-G (Frameless) at 1,500 volts each. Due to this, this surge protector works best when a skilled operator manages the volume of power that is transmitted to a residence during a surge event.

Protection Mode

Our team could not be more pleased to see this popular Intermatic model offering all four major types of protection in one package. You’ll have all of the modes available to you on the Intermatic Smart Guard IG2240-IMSK if you need them. These different modes of surge protection each come with a different MCOV and VPR, allowing you to manage your surge protection more efficiently without the need to install multiple units.

IG2240-IMSK vs IG1240RC3 from Intermatic

In the current catalog of Intermatic devices, you may be surprised to see that the IG2240-IMSK and IG1240RC3 are side-by-side. Despite their noticeable differences on both an aesthetic and functional level, these two models are frequently compared.

It is similar to a traditional switch box in appearance and function. Despite the fact that the three modules within the unit work independently, when they are used in concert they are capable of suppressing surges of up to 10,000 amps. TFMOV’s surge protection modules are designed to be replaceable. This enables the technology’s capacity to be maximized time after time.

When installed beside a traditional fuse box, Intermatic’s IG1240RC3 can handle 100,000 amps of surge energy as a standalone unit. Due to its use of type 3R enclosures, the IG1240RC3 was also designed for outdoor use. Considering its estimated $100 price, this model is more affordable than other models that do not offer a 5-year warranty.

It is a much better choice for those with a large household or many important electronic devices throughout their homes to opt for the Intermatic IG1240RC3 rather than the IG1240RC3. Intermatic’s Smart Guard IG2240-IMSK is a good choice for people living in rainy climates, as this model is prone to lightning.

Intermatic Smart Guard IG2240-IMSK Whole Home Surge Protector – FAQs

Have you ever replaced a module because of a surge?

After a lightning strike on the transformer, my panel was hit by a surge. There was extensive wiring damage to one module during a failure.

The panels I have are each 200 amps. Is one panel sufficient for both panels, or should I buy one for each?

It is only required to have one unit if a panel is a subpanel or a feed-through arrangement. The surge protection will be needed for each panel if the panels have individual feeders.

What about incoming voltage fluctuation from the meter being subjected to power conditioning?

I don’t think so at all. Here, levels above a certain threshold are clamped to suppress transient voltages.

Is it necessary to have three modules? An individual reader reported three instances of high surges. Negative, positive, and ground are separated in a source

Three modules will be used: one will be used to phase-to-phase (two 220VAC hotlines; black wires); the remaining two will be used to reference each 220VAC hot leg to its neutral (white). Grounding the cabinet is done with the ground wire (Green). Here, the ground is not referenced since we bond the neutral and ground back at the entry point (Single point of bonding per code).

Is this unit capable of communicating? IoT security status – what’s the situation? Is it necessary for us to verify that?

Checking the status of the unit is not possible using the app for this model.


Intermatic Smart Guard IG2240-IMSK is an ideal house surge protector, based on our evaluation of it. A strong surge protector comes with this model, which is ideal for someone who expects to use his or her device for many years. The warranty is for 10 years.

A revolutionary breakthrough in surge suppression technology, Intermatic Smart Guard’s IG2240-IMSK pioneered the technology that has been utilized by hundreds of surge suppressors over the past several decades. Hence, this module’s TPMOV modular surge protection technology will not disappoint whether you deploy it for a Type 1 or Type 2 installation.