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The QOB350EPD is a durable Square D 3-Pole 50 Amp 240 Volt breaker designed for equipment protection. This bolt-on breaker ensures reliable performance, offering superior overload and short-circuit protection for your electrical systems. Upgrade your power management with this high-quality component, ideal for a variety of applications and environments.
No, they are not interchangeable. The QOB350EPD is a bolt-on breaker that mechanically fastens to the bus bar, while the QO350 is a plug-on breaker. Beyond the mounting difference, the QOB350EPD includes Equipment Protection Device (EPD) ground-fault protection designed to protect equipment (Class B, 30mA trip level) — a feature not found on the standard QO350. Always verify your panelboard accepts bolt-on QOB breakers before ordering.
EPD stands for Equipment Protection Device — it provides Class B ground-fault protection (tripping at approximately 30mA) intended to protect equipment and wiring from ground-fault damage, rather than people (which is the role of GFCI at 5mA). The Canadian Electrical Code (CEC) requires ground-fault protection for certain equipment and feeder applications, particularly in commercial and industrial settings. Check with your local AHJ (Authority Having Jurisdiction) or electrician to determine whether EPD protection is required for your specific installation.
Availability of specialty breakers like the QOB350EPD can vary. Northern Breaker Group specializes in both current-production and hard-to-find or obsolete breakers, with counter locations in Calgary, Edmonton, and Vancouver. If this unit is out of stock through standard channels, we can often source it — contact us with your requirements and we'll work to get you what you need.
