Struggling with safeguarding your home’s electrical system from surges?

In this blog, we take an in-depth look at the Intermatic Smart Guard IG2240-IMSK, a top-tier whole-house surge protector that stands out for its superior protection capabilities and innovative features. Designed to shield your home from external and internal electrical surges, this device is a vital addition for anyone seeking to enhance their home’s electrical safety. We explore its unique modular design, easy-to-replace modules, and robust construction, making it a practical solution for modern homes facing the challenges of electrical surges.

Boasting years of expertise in home electrical safety and technology, we’ve guided numerous homeowners in fortifying their electrical systems. Our extensive testing of the Intermatic Smart Guard IG2240-IMSK confirms its effectiveness in preventing damage from power surges, ensuring the longevity of home appliances, and providing peace of mind. This surge protector is not just about basic protection; it excels with features like LED indicators, a compact footprint, and its ability to handle large surges, making it a standout choice in the market. We’ve assessed its installation process, surge protection performance, and overall durability under various conditions, concluding it to be a stellar investment for homeowners seeking a reliable and advanced surge protection solution.

Intermatic Smart Guard IG2240-IMSK Review 2024

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 three 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 offer 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.

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

Have you ever replaced a module because of a surge?

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

The panels I have each have 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 fluctuations 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 220 VAC hotlines; black wires); the remaining two will be used to reference each 220 VAC 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.

Over the course of several decades, hundreds of surge suppressors have used the technology that Intermatic Smart Guard’s IG2240-IMSK invented as a ground-breaking advancement in surge suppression. Hence, this module’s TPMOV modular surge protection technology will not disappoint, whether you deploy it for a Type 1 or Type 2 installation.