Square D HDA36125SR 125A 3-Pole 600 V Circuit Breaker

Meet the Square D HDA36125SR, a rugged 125 A, 3-pole, 600 V circuit breaker designed to safeguard three-phase electrical systems with dependable, durable protection. Built by Square D, this part is engineered for reliability in industrial and commercial panels where consistent trip performance and solid bus connections matter most.

Key specifications at a glance

• Current rating: 125 A
• Poles: 3
• Voltage rating: up to 600 V
• Part number: HDA36125SR
• Brand: Square D (Schneider Electric)

Why a 3-pole design matters

In a three-phase system, a 3-pole breaker protects all hot legs simultaneously. The HDA36125SR ensures that, in the event of an overload or fault, all three phases trip together, maintaining circuit balance and enhancing overall equipment safety. This synchronized behavior is essential for protecting motors, compressors, and other three-phase equipment from partial faults that can cause damage or unsafe conditions.

Ideal use cases

• Protecting feeders in three-phase panelboards for commercial or light-industrial installations
• Motor control and HVAC applications requiring reliable 3-pole, 125 A protection up to 600 V
• Replacement or upgrade in compatible Square D panels where matching part numbers ensure proper fit and performance

What sets this breaker apart

The HDA36125SR combines the trusted Square D lineage with a precise, robust trip mechanism and durable construction designed for demanding environments. Its three-pole configuration delivers balanced protection across all phases, reducing the risk of unbalanced faults and equipment damage. When you need a dependable, readily replaceable component in a Square D system, this part number gives you a known fit and consistent performance.

Practical guidance for installation and use

• Verify panel compatibility with the HDA36125SR to ensure correct mounting and electrical fit
• Confirm three-pole, 125 A protection is appropriate for your load and system design
• Follow local electrical codes and manufacturer instructions during installation
• Respect torque specifications on terminal connections and inspect for secure bus contacts during replacement

For dependable three-phase protection in demanding environments, the Square D HDA36125SR 125 A, 3-pole, 600 V circuit breaker is a strategic choice that aligns with Square D panels and long-standing electrical reliability.