Description
Leviton P3277-YB Industrial Surge Protective Device Guide
Quick Answer: The Leviton P3277-YB is a heavy-duty commercial/industrial Type 1 Whole-Facility Surge Protective Device (SPD) designed for 277/480V 3-Phase Wye electrical systems. It delivers 50 kA of maximum surge current protection per phase (25 kA per mode), features a 200 kA Short Circuit Current Rating (SCCR), and is housed in a NEMA 4X weather-resistant enclosure for indoor or outdoor panel installation.
Leviton P3277-YB Overview & Key Features
The Leviton P3277-YB is specifically engineered to protect high-voltage 277/480V 3-phase industrial power distribution panels, HVAC equipment, commercial lighting circuits, and heavy facility machinery against severe electrical transients and utility switching surges:
- Type 1 SPD Versatility: Certified for line-side installation (before main service disconnect) or load-side distribution panelboard installation.
- High-Voltage 3-Phase Defense: Tailored for 277/480 VAC 3-Phase Wye configuration (4-Wire + Ground).
- Heavy-Duty Suppression: Built with thermally protected Metal Oxide Varistors (MOVs) offering up to 50 kA maximum surge capacity per phase.
- Real-Time LED Diagnostics: Features visual LED status monitoring per phase to verify continuous active surge protection across all hot legs.
- NEMA 4X Weatherproof Enclosure: Encased in a UV-stabilized, water-tight, and dust-resistant enclosure suited for harsh indoor or outdoor environments.
Leviton P3277-YB Technical Specifications
Core performance specs and electrical ratings for the Leviton P3277-YB Surge Protective Device:
| Specification Parameter | Rating / Value | Details & Standard |
|---|---|---|
| Operating Voltage / System | 277/480 VAC | 3-Phase Wye (4-Wire + Ground), 50/60 Hz |
| SPD Rating Type | Type 1 / Type 2 | UL 1449 4th Edition Listed |
| Max Surge Current Capacity | 50 kA per Phase | 25 kA per Mode (L-N, L-G, L-L, N-G) |
| Short Circuit Current Rating (SCCR) | 200 kA | High-capacity short circuit protection rating |
| Nominal Discharge Current (In) | 10 kA | UL 1449 tested discharge capacity rating |
| Voltage Protection Rating (VPR) | 1200V (L-N) / 2000V (L-L) | Clamping threshold voltage protection level |
| Enclosure Rating | NEMA 4X / IP66 | Corrosion-resistant, weatherproof plastic enclosure |
Installation & Mounting Guidelines
- Conduit Mounting Nipple: Mounts directly to 277/480V 3-phase load centers or distribution panels via a standard 1/2" threaded conduit knockout nipple.
- Breaker Connection (Load Side): Connect through a dedicated 3-pole 20A circuit breaker when installed on the load side of the main service disconnect.
- Lead Length Optimization: Keep all connecting phase, neutral, and ground conductors as short, straight, and unbundled as possible to minimize lead inductance and optimize clamping speed.
Frequently Asked Questions
What electrical system is the Leviton P3277-YB designed for?
The Leviton P3277-YB is designed specifically for high-voltage 277/480V 3-Phase Wye (4-wire plus ground) commercial and industrial electrical panels.
What is the difference between the P3277-YB and P3120-YB?
The P3277-YB is engineered for 277/480V 3-Phase Wye commercial/industrial systems, whereas the P3120-YB is configured for lower voltage 120/208V 3-Phase Wye commercial systems.
Can the P3277-YB be flush-mounted in finished walls?
Yes. When installed in finished wall cavities, the P3277-YB can be flush-mounted using the Leviton PSURG-FLG flush mount flange kit to neatly frame and cover the wall cutout.
Spec Sheets
Download the official manufacturer documentation and specifications:
Additional Information
Our Part No: |
BSF-LVTN-P3277-YB |
Mfr Part #: |
P3277-YB |
Brand: |
Leviton |
Fixture Type: |
Residential and light use commercial 3-phase applications |
Surge Protection: |
Three Phase WYE |
Voltage: |
480Y/277 VAC |
Protection per Mode / per Phase: |
25kA / 50kA |
Voltage Protection Rating: |
L-N: 1200V, L-G: 2500V, N-G: 1000V, L-L: 2000V |
Product Data Sheet: |
See PDF Link Provided |
Dimensions: |
5.02" x 2.93" x 3.25" |
Enclosure: |
NEMA 4X |
Warranty: |
Manufacturer's |
Case Size: |
10 |
