Square D HDA261251 - 125 A, 600 V, 2-Pole Plug-In Circuit Breaker | AmpState

The Square D HDA261251 is a 125 A, 600 V, 2-pole plug-in molded case circuit breaker designed to deliver dependable branch-circuit overcurrent and short-circuit protection in panelboards and load centers. With a fast plug-in connection, it streamlines installation and replacement, helping you minimize downtime during panel upgrades or service calls.

Key advantages that matter in real-world installations

• Fast plug-in connection: Precisely aligns with compatible OEM panelboards and load centers, reducing install time and tightening the path to code-compliant protection.
• Thermal-magnetic trip unit: Combines thermal overload protection with instantaneous magnetic trip for short circuits, delivering stable, repeatable performance across varying loads and temperatures.
• 2-pole design for 120/240V applications: Suitable for common branch circuits and multi-wire branch circuits, providing coordinated protection for both hot legs.
• Broad compatibility: Engineered to fit and function with matching Square D OEM panelboards and load centers, preserving system integrity and electrical listings.

Who this is for and practical use cases

• Residential electricians upgrading service panels or adding subpanels to support renovations or additions.
• Commercial electricians provisioning small to mid-size distribution panels, machine feeds, or lighting and receptacle circuits in offices or retail spaces.
• Light industrial setups needing reliable protection for feeders and control circuits in compact panel configurations.

What problems it solves

• Prevents damage from overcurrent conditions by interrupting fault currents quickly and reliably.
• Limits heat-related wear on conductors with precise thermal-magnetic protection, improving long-term panel performance.
• Reduces maintenance time with a plug-in design that simplifies replacement and reduces field wiring complexity.

Technical snapshot and installation notes

• Manufacturer: Square D
• Part number: HDA261251
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 125 A
• Voltage rating: 600 V
• Number of poles: 2
• Mounting style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Practical tips for best results

• Verify that your panelboard or load center is a compatible Square D OEM model to ensure proper fit, electrical clearance, and listing compliance.
• When replacing an existing breaker, match the current rating (125 A) and the two-pole configuration to preserve protective coordination and panel specifications.
• Follow standard safety practices: de-energize the panel, discharge stored energy, and use appropriate PPE during installation.
• Ensure tight, manufacturer-specified torque on bus connections to maintain reliable contact and consistent trip performance.