Square D JJL36250U44X - 250 A, 600 V, 3-Pole Circuit Breaker | AmpState

Square D JJL36250U44X is a rugged 250 A, 600 V, 3-pole molded case circuit breaker engineered to deliver dependable branch circuit protection in panelboards and load centers. Built for durability and precise trip performance, this device keeps electrical systems safe from overloads and short circuits while maximizing panel space.

Why this 3-pole molded case breaker stands out

• Compact molded case design reduces footprint inside panels, helping you fit more circuits without compromising protection or serviceability.
• Thermal-magnetic trip unit provides stable, repeatable protection across a range of fault conditions and ambient temperatures—so you get reliable disconnection when it matters most.
• Three-phase protection with a 3-pole configuration ensures simultaneous disconnection of all conductors, enhancing safety in three-phase systems and minimizing arc flash risk during faults.
• OEM-compatible designed to pair with matching Square D loadcenters and panelboards for straightforward replacement and streamlined field upgrades.

Core specifications at a glance

• Manufacturer: Square D
• Part number: JJL36250U44X
• Amperage rating: 250 A
• Voltage rating: 600 V
• Poles: 3
• Type: Thermal-magnetic molded case circuit breaker
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases and scenarios

• Commercial spaces with three-phase distribution where robust fault protection is essential for safety and uptime.
• Residential-grade commercial installations transitioning to higher-capacity panels requiring reliable 250 A protection.
• Light industrial equipment layouts that demand quick disconnection of all three phases during a fault to prevent equipment damage.

How it integrates with your system

This JJL36250U44X breaker is designed to work seamlessly with matching OEM loadcenters and panelboards, enabling a clean, plug-and-play replacement or upgrade path. Its high-current rating makes it suitable for feeding large branches or main distribution points, while the 600 V rating provides the headroom needed for commercial and industrial environments.

Practical considerations and tips

• Ensure compatibility with your existing Square D panelboard or loadcenter to maintain UL-listed protection and warranty coverage.
• Use within standard electrical codes and manufacturer installation guidelines. Proper sizing of conductors and correct torque on connections are essential for reliable operation.
• Consider the benefits of a thermal-magnetic trip: instantaneous response to short circuits plus thermal protection to guard against nuisance trips due to ambient temperature or load fluctuations.
• Ideal as part of a modular protection strategy—pair with other rated devices in the same family to maintain coordinated protection across your electrical system.

Upgrade your panel’s reliability with the Square D JJL36250U44X—delivering strong overcurrent defense, clean panel integration, and peace of mind for commercial and light industrial electrical layouts.