Eaton SPC120277N4P Surge Protection Device - UL 1449
Part Number: SPC120277N4P
Quick Summary
The Eaton SPC120277N4P surge protection device secures 277 V single‑phase circuits in industrial and commercial panels. A common pain point is voltage transients that cause unexpected downtime and expensive equipment repairs, which this unit is designed to mitigate. It carries UL 1449 listing for surge protection performance and a rugged NEMA 4X enclosure for demanding environments, ensuring reliable operation even under dust, moisture, and washdown. The Form C relay adds versatile signaling and integration with control systems. By aligning with the SPC series and 277 V systems, this protector delivers predictable protection, helping facilities meet reliability standards while reducing overall lifecycle costs and maintenance burdens.
Product Information
Extended Description
SPC120277N4P Eaton: Surge Protection Device, SPC series, 120 kA, 277V, Single-phase, NEMA 4X, Form C relay
Product Name
Eaton SPC series surge protection device
Catalog Number
SPC120277N4P
UPC
786680218323
Product Length/Depth
5.5 in
Product Height
6 in
Product Width
3.19 in
Product Weight
2.5 lb
Warranty
10 year
Certifications
UL 1449
Type
Surge protection device
Special features
Form C relay
Voltage rating
277 V
Enclosure
NEMA 4X
Phase
Single-phase
Mounting Method
External side
Interrupt rating
120 kAIC
Series
SPC
The SPC120277N4P delivers a 120 kAIC interrupt rating on 277 V single‑phase circuits, which limits transient energy and shields downstream equipment from damaging spikes. This translates into fewer nuisance trips, reduced component wear, and longer life for sensitive drives, relays, and control electronics in motor controls and power distribution panels. The rugged NEMA 4X enclosure enhances durability, enabling outdoor or washdown installations and minimizing additional housing requirements while maintaining compact form. With Form C relay capability, the unit supports status signaling and integration with building management or PLC-based monitoring, streamlining fault indication and maintenance planning. Compatibility with SPC series protection schemes simplifies upgrades and multi‑point protection in existing panelboards, improving installation efficiency and reducing commissioning time. UL 1449 listing confirms conformity to surge protection performance standards, while the 10‑year warranty lowers total cost of ownership and supports long‑term reliability in harsh industrial environments.
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FAQs
For installation, ensure the device is mounted using external side access in a 277 V single‑phase system. The NEMA 4X enclosure supports outdoor or harsh indoor environments, reducing the need for additional protective housings. Wire the unit according to the SPC series guidelines, and use the Form C relay outputs for status signaling to a PLC or control system. Confirm compatibility with your panelboard or motor control center prior to retrofit to minimize downtime.
Key ratings include 277 V single‑phase operation and a 120 kAIC interrupt rating, which denotes the maximum surge current the device can safely interrupt. These specs translate to robust protection for sensitive loads such as drives and control electronics, reducing the risk of transient damage during lightning events or switching transients. The UL 1449 listing further validates performance, while the Form C relay supports monitoring and remote signaling.
Yes. Designed for 277 V single‑phase systems, the SPC120277N4P is well suited for HVAC panels, lighting subpanels, and control cabinets in industrial environments. Its NEMA 4X enclosure and Form C signaling facilitate reliable operation in damp or dusty locations, while its compact form and external side mounting simplify retrofit into existing SPC series installations.
The device is UL 1449 listed for surge protection performance, providing confidence in transient energy handling. It also features a rugged NEMA 4X enclosure suitable for indoor and outdoor environments. These certifications and ratings support compliance with industrial safety and reliability standards and help meet system-level reliability requirements in critical applications.
The SPC120277N4P carries a 10‑year warranty, offering long‑term protection and reduced risk of unscheduled downtime. Routine maintenance typically involves periodic inspection of connections and signaling circuits, with no moving parts beyond the relay contacts. The combination of high interrupt rating, durable enclosure, and long warranty supports favorable total cost of ownership by minimizing replacement and downtime costs over the system lifecycle.