Square D QDA221751 - 175 A, 2-Pole Plug-In Circuit Breaker | AmpState

Square D QDA221751: 175 A, 2-Pole Plug-In Circuit Breaker for Fast, Reliable Protection

The Square D QDA221751 is a 175 A, 2-pole plug-in molded case circuit breaker engineered for dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Designed to fit seamlessly into compatible OEM assemblies, it delivers consistent protection in a range of environments from residential to light commercial and industrial settings.

Key benefits you’ll notice

• Fast plug-in connection enables quick installation and effortless replacement, minimizing downtime during upgrades or servicing.
• Thermal-magnetic trip unit provides stable, repeatable protection by handling both overload conditions and short circuits with predictable trip behavior.
• 2-pole, 175 A design supports higher-current circuits while preserving a compact footprint suitable for standard enclosures.
• Plug-in mounting simplifies maintenance and retrofits compared with bolt-on or screw-in alternatives.
• OEM compatibility specifically crafted to work with matching Square D loadcenters and panelboards for a reliable electrical interface.

Where it shines

Ideal for protecting branch circuits in a variety of applications — from home subpanels and office electrical rooms to light industrial equipment. It delivers robust protection for lighting, outlets, motors, and other essential loads, preventing damage from overcurrent and short circuits while enabling straightforward service and upgrades.

Technical snapshot

• Manufacturer: Square D
• Part number: QDA221751
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 175 A
• Number of poles: 2
• Mounting style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Practical tips and best practices

• Confirm panelboard compatibility with the QDA221751 before replacement to ensure a perfect fit and electrical interface.
• Keep plug-in terminals clean and free from corrosion; inspect for any damage and replace if needed to maintain optimal contact.
• When adding circuits, distribute load to stay within the 175 A rating and prevent nuisance trips due to overloading.
• In routine maintenance, verify that the thermal-magnetic trip operates within expected tolerances to ensure consistent protection over time.