Square D HDA36150U43X - 150 A, 3-Pole Plug-In Circuit Breaker | AmpState

Meet the Square D HDA36150U43X, a 150A, 3-pole plug-in molded case circuit breaker designed to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Built for fast, hassle-free replacements and long-lasting performance, this breaker keeps vital electrical systems safe with minimal downtime.

Why this breaker stands out

• Fast plug-in connection: Seamless installation and quick replacements mean less service interruption when upgrading panels or swapping a failing unit.
• Thermal-magnetic trip unit: Combines a precise thermal element for overload protection with a magnetic stimulus for immediate short-circuit response, delivering stable, repeatable protection across varying loads.
• Compatibility with OEM load centers: Engineered to fit and function with matching Square D panelboards and other compatible OEM enclosures, ensuring reliable electrical performance and easier system integration.
• Three-pole design for 3-phase systems: Ideal for commercial and light industrial electrical distributions that rely on balanced, three-phase power, or mixed-volt configurations requiring robust protection.
• Versatile applications: Suitable for residential service upgrades, small to mid-size commercial installs, and light industrial panel configurations where dependable overcurrent and short-circuit protection is essential.

What you gain in daily use

With the HDA36150U43X, technicians experience streamlined maintenance — simply plug in the unit to restore service after a fault, then rely on its thermal-magnetic trip to protect wiring and devices from damage. The 150A current rating provides ample headroom for demanding circuits, while the 3-pole design supports efficient distribution across three-phase loads. Its plug-in format reduces panel downtime during upgrades or replacements, helping you keep critical equipment online when it matters most.

Technical snapshot

• Manufacturer: Square D
• Part Number: HDA36150U43X
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 150A
• Number of Poles: 3
• Mounting Style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Designed for professionals seeking a reliable, easy-to-install protection solution in panelboards and load centers, the Square D HDA36150U43X combines quick plug-in installation with proven safety mechanisms. Whether upgrading a residential panel or outfitting a small commercial electrical room, this 3-pole 150A plug-in breaker delivers consistent performance when it counts most.