Intermatic AG3000 120/240 VAC Universal HVAC Surge Protective Device
Quick take
The Intermatic AG3000 is an HVAC-focused surge protective device (SPD) for 120/240 VAC systems, built to help protect equipment like heat pumps, furnaces, and air conditioners from damaging power surges. It includes a visible green LED status indicator and is sealed in a Type 4X watertight, UV-resistant enclosure for outdoor or exposed installations. The main buying caveat is that it is designed specifically for the 120/240 VAC HVAC use case, so you need the right electrical setup to get the best fit.
Pros and cons
Pros
- Three protection modes (L-G, L-L, L-N) aimed at common surge pathways for HVAC protection.
- TPMOV thermally protected metal oxide varistor technology, positioned to avoid hazardous failure modes common to standard MOV approaches.
- Type 4X watertight and UV-resistant enclosure supports outdoor installs.
- Green LED makes it easy to spot whether the unit’s protection status is active.
- UL listed to ANSI/UL 1449 (5th edition), aligning with recognized safety standards for SPDs.
Cons
- Best suited for HVAC 120/240 VAC applications, not a general-purpose plug-in surge protector.
- “You can’t easily test protection” is a reality with SPDs, so buyers often rely on the status LED and proper installation.
- Installation may require opening an HVAC disconnect or quick disconnect setup, which may not be DIY-friendly for everyone.
What buyers think
Buyer-review evidence is strongly centered on straightforward installation and practical day-to-day visibility. Multiple shoppers mention that setup is quick and that the green indicator light is easy to see, which helps reduce uncertainty after installation. Several reviews also describe long service life in real-world home HVAC use, suggesting the enclosure and overall construction hold up well over time. The review evidence does not provide deep, testable performance metrics beyond the trust buyers place in the device’s surge protection role, so it is best viewed as an equipment-protection component where “working” is verified through correct installation and ongoing status indication.
What the intermatic AG3000 is for
The AG3000 is an HVAC surge protective device intended to be integrated into the power path feeding heating and cooling equipment. If your home has minisplits, heat pumps, air conditioners, or furnaces running on 120/240 VAC, an SPD like this is meant to add protection against voltage spikes and transient overvoltages that can stress sensitive components.
Key features that matter for HVAC protection
Protection modes for different surge paths
Instead of focusing on a single scenario, the AG3000 provides protection across three modes: L-G, L-L, and L-N. This coverage is relevant because surges can enter or stress systems through multiple electrical relationships in a typical power distribution.
TPMOV technology (thermally protected varistors)
Intermatic uses TPMOV technology, which is designed to address hazardous failure modes associated with conventional MOV-based designs. For buyers, the practical takeaway is that the device is built around a protection approach intended for safer long-term operation in surge conditions.
Weather-ready enclosure (Type 4X, UV resistant)
HVAC gear is often exposed to the elements, especially when installed near outdoor disconnects or in outdoor-ready locations. The AG3000 comes in a Type 4X watertight enclosure and is described as UV resistant, which helps it fit both indoor and outdoor use cases where moisture and sunlight exposure are concerns.
Green LED status indicator
The unit provides a green LED indicator so you can quickly check protection status at a glance. This is useful because SPDs are not like a device that you “feel” working during normal operation, and a visible status light can reduce guesswork after installation.
Safety standard and certification
The AG3000 is UL listed to ANSI/UL 1449 (5th edition). That certification matters for shoppers who want an SPD aligned with established surge protection safety requirements.
Pros and cons in real buying terms
Who it’s a good fit for
- Homeowners adding surge protection to 120/240 VAC HVAC equipment such as heat pumps, air conditioners, and furnaces.
- Shoppers who want a weather-sealed SPD for outdoor or exposed installations.
- Buyers who prefer a clear, on-device status indicator (green LED) to monitor at-a-glance condition.
- People who value safety listing to recognized SPD standards when protecting higher-value equipment.
Who should look elsewhere
- If you’re looking for a basic plug-in surge protector for electronics, this HVAC SPD form factor is the wrong category.
- If your system voltage does not match 120/240 VAC, you should not assume compatibility.
- If you’re not comfortable with integrating an SPD into an HVAC disconnect or quick disconnect setup, consider professional installation or a simpler alternative in your electrical configuration.
Verdict
The Intermatic AG3000 is a purpose-built HVAC surge protective device that brings together three surge protection modes, TPMOV-based protection design, a visible status LED, and an outdoor-ready Type 4X enclosure. It is a strong option for buyers protecting 120/240 VAC heating and cooling equipment who want a safer, weather-sealed SPD component rather than a general-purpose power strip. The biggest limitation is simply fit, voltage, and installation approach, so double-check your system requirements before buying.
Price and availability
Pricing and stock can change quickly. Check the current listing here: Buy on Amazon.
FAQ
What voltage is the Intermatic AG3000 designed for?
It is designed for 120/240 VAC HVAC applications.
Does it have a way to check whether it is active?
Yes. A green LED indicator provides at-a-glance protection status.
Is it suitable for outdoor installations?
It uses a Type 4X watertight, UV-resistant plastic enclosure, which supports indoor and outdoor setups.
What protection modes does it provide?
It provides three modes of protection: L-G, L-L, and L-N.
Is this a general-purpose surge protector for electronics?
No. It is an HVAC surge protective device intended to protect heating and cooling equipment in a 120/240 VAC setup.
Specifications
| Product Title | Intermatic AG3000 120/240 VAC Universal HVAC Surge Protective Device - Advanced Surge Protection, TPMOV Tech, Watertight Enclosure - UL Listed for Reliable Safety |
|---|---|
| Category | Electronics > Accessories & Supplies > Power Strips & Surge Protectors > Surge Protectors |
| Manufacturer | Intermatic Incorporated |
| Color | Color |
| Material | Plastic,Metal |
| Size | Pack of 1 |
| Item Weight | 11.2 ounces |
| Product Dimensions | 4.3 x 2 x 4.5 inches |
| Part Number | AG3000 |
| Item model number | AG3000 |
| Is Discontinued By Manufacturer | No |
| Shape | Rectangular |
| Item Package Quantity | 1 |
| Number Of Pieces | 1 |
| Number of Handles | 1 |
| Usage | personal |
| Included Components | AG3000 |
| Batteries Included? | No |
| Batteries Required? | No |
| Warranty Description | See Manf Description |
Available variants
Size
- Pack of 1
- Pack of 2
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