Introduction

Power surges — from lightning strikes, utility switching and upstream load events — cause costly damage to appliances, electronics and critical systems. The new **POSP 20 Series** plug-on surge protective device offers an easy, reliable way to add whole-house surge protection at the breaker panel. Designed as a compact UL Type 1 SPD with quick plug-on installation, POSP 20 delivers high-energy surge suppression and clear LED status indication for peace of mind.

Why choose a Plug-On SPD for Whole-House Protection?

A plug-on SPD installs directly into the load center and minimizes lead length between the SPD and the service, which significantly improves suppression performance. For homeowners, installers and electrical contractors, plug-on SPDs mean:

  • Fast, space-saving installation— fits two adjacent 1-inch poles in standard load centers.
  • Superior surge suppression— shorter lead lengths reduce let-through voltage to downstream equipment.
  • Clear status monitoring — LED indicates power and protection health for easy maintenance.

 

Key Features of the POSP 20 Series

UL 1449 5th Edition Type 1 certified — engineered for protection at the service entrance.

Nominal discharge current (In) 20kA (8/20μs) per mode, with 50kA surge capacity for high-energy events.

Full mode protection (L1–N, L2–N, L1–L2)  with Voltage Protection Ratings (VPR) suitable for split-phase systems.

Patented PTMOV (thermally protected MOV) technology for enhanced safety and high SCCR performance.

SCCR up to 10kArms without external fuse or breaker (pending listing).

Easy LED status indicator— green = normal; LED off indicates loss of protection and replacement required.

Technical Specifications (quick reference)

Model:  POSP120SP20.

Power system: 120/240 Vac, split phase 3W (L1, L2, N).

Nominal discharge current (In): 20kA (8/20µs).

-Surge capacity per phase: 50kA (8/20µs).

VPR (L–N / L–L): 600V / 1000V.

MCOV: L–N 150Vac, L–L 300Vac.

Installation width:  two adjacent 1-inch poles; neutral connect to neutral bus.

Operating temperature:  −40°C to +75°C; humidity 5–95% (25°C).

Dimensions: 74 × 50 × 64.5 mm. **Warranty:** 5 years.

 

Installation & Compliance Notes

POSP 20 is optimized for quick plug-on mounting into standard load centers from common manufacturers — make sure the unit is placed as close as possible to the main breaker or main lug and the neutral bar to maximize performance. Always follow local electrical codes and UL/ANSI guidelines during installation. Do **not** Hi-Pot test the SPD (this will cause premature failure). fileciteturn0file0

Benefits by Use Case

 Residential homeowners: Protect refrigerators, HVAC systems, smart home devices and entertainment systems from damaging transients.

Commercial & light industrial sites: Protect POS systems, servers and control equipment at the service entrance with Type 1 protection.

Renewable energy & EV charging applications: Use at the panel to add a first line of defense against lightning-induced surges and grid switching events.

 

Call to Action

Protect your home or facility now — contact our sales team for pricing, load center compatibility, and bulk orders. For technical datasheets and installation guidance, download the full POSP 20 datasheet or email our technical support.