Schneider Electric QO2175SB Secondary Surge Arrestor – 5 kA Plug-On SPD for QO Load Centers

Overview

The Square D QO2175SB surge arrestor from Schneider Electric offers compact, plug-on protection for QO load centers. Built to handle common home and small business surges, this device delivers 5 kA of surge capability in a 120/240 VAC, 1-Phase, 3-Wire configuration, with a modest footprint that fits neatly into existing panels.

Each MOV inside the unit is individually fused for targeted protection and peace of mind. The plug-on design eliminates complex wiring, while two adjacent mounting spaces ensure a straightforward installation. An integrated LED indicator provides a quick health check, so you can see the unit is active without opening the panel.

Why choose this SPD?

• High-energy circuitry for robust surge suppression during transient events.
• Individually fused MOVs offer reliability and clearer fault isolation.
• Plug-on, two-space mounting—compact and simple to retrofit into existing panels.
• LED status indicator for at-a-glance operation checks.
• CSA Certified and suitable for indoor NEMA 1 enclosures, designed for residential or small commercial use.

Real-world use cases

Use this SPD to protect everyday equipment such as entertainment centers, computer networks, home automation gear, solar inverters, temperature control systems, and uninterruptible power supplies. It’s also a practical addition for EV charging setups and small-scale building controls where reliable power quality matters.

Specifications and environment

• Voltage: 120/240 VAC, 1 Phase, 3-Wire
• Protection rating: 5 kA, SCCR 22.5 kA
• Configuration: Indoor NEMA 1, plug-on, requires two adjacent spaces
• Indicator: LED status
• Certification: CSA Certified

Sustainability and support

Schneider Electric positions this SPD as part of a broader approach to energy efficiency and reliability. The solution complements a safer, more resilient electrical system and aligns with a mission to enable safer, smarter energy usage across homes and small businesses.

How it protects your system

During a surge event, voltage spikes can travel through electrical lines to sensitive equipment. The QO2175SB intercepts these spikes, helping to limit the energy reaching connected devices and reducing the risk of nuisance tripping or equipment instability. While performance varies by site, many users notice calmer operation of electronics and reduced nuisance resets.

Installation tips

Before installation, switch off power to the panel and follow standard safety procedures. The SPD slides into two adjacent slots in the QO load center and is ready for quick connection. Keep the LED indicator visible after installation for ongoing status checks.

Warranty and certification

CSA certification and documentation accompany the product, ensuring compliance with applicable standards for indoor use in North American panels.