Generac 9954 150A 1ph-120/240V Service Rated Nema 3R Automatic Transfer Switch with Integrated SPD Features:
Generac 9954 150A Service-Rated Automatic Transfer Switch Features:
The Generac 9954 150A Service-Rated Automatic Transfer Switch (ATS) is engineered to be the centerpiece of your home’s standby power setup—offering automatic switching and built-in surge protection all in one solid package. Service-rated so it can function as the main disconnect, the 9954 simplifies installation where code requires such capacity. With its integrated Surge Protection Device (SPD), this ATS not only handles outages but guards your home and electronics against damaging electrical surges.
Once the utility voltage drops below acceptable levels, the 9954 senses the failure and automatically engages your standby generator. When utility power returns, it reverts smoothly—thanks to open-transition switching design that avoids overlapping sources and minimizes stress on both generator and house wiring. Timing mechanisms and sensing logic are all handled internally, ensuring reliable operation without manual intervention.
Built for long service life and rugged environments, the enclosure is rated for outdoor use (weather-resistant), and made with durable, corrosion-resistant materials. The design includes lugs sized for thick conductors, a heavy-duty contactor capable of frequent switching under load, and clearly accessible controls or indicators. With the 9954, you get whole-house surge protection, high-amp switching capability, and a durable service-rated frame.
Backed by a manufacturer warranty and designed to integrate seamlessly with Generac standby generators, the 9954 is ideal for homeowners who want both surge protection and high amp transfer switching without needing separate devices.
Key Features
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150 Amp service-rated automatic transfer switch suitable for single-phase, 120/240V systems
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Integrated Surge Protection Device (SPD) to protect against voltage spikes and transients
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Service entrance rated—can serve as main disconnect where code allows
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Open-transition switching — avoids overlap between utility and generator power sources
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Heavy-duty contactor and lugs engineered for high load and frequent switching
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Weather-resistant enclosure suitable for outdoor mounting; corrosion-resistant finish
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Designed for compatibility with Generac standby generators (Evolution™ / Nexus™ controllers)
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Built-in load-management capability; may support multiple HVAC loads depending on system setup
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Compact footprint for its class; clear wiring access points
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Comes with a full warranty for peace of mind
