Square D HLL36125 - 125 A, 600 V, 3-Pole Circuit Breaker | AmpState

Meet the Square D HLL36125—a 125 A, 600 V, 3‑pole molded‑case circuit breaker engineered for dependable branch circuit protection in panelboards and load centers. Built by a trusted name in electrical protection, this unit delivers precise, repeatable performance when you need it most—whether you're wiring a home, a commercial space, or light industrial equipment.

• Compact molded‑case design minimizes panel footprint while delivering robust protection, making it easier to fit multiple breakers in a dense panel configuration without sacrificing reliability.
• Thermal‑magnetic trip unit provides stable, repeatable protection for both overloads (thermal) and short circuits (magnetic), helping prevent nuisance trips and unplanned downtime.
• OEM‑grade compatibility is designed to work with matching Square D load centers and panelboards, ensuring a clean fit, predictable performance, and simplified maintenance.
• Versatile voltage and current rating supports a wide range of applications—125 A capacity at up to 600 V—making it suitable for 3‑phase distribution in residential, commercial, and light industrial environments.
• 3‑pole construction ideal for protecting 3‑phase circuits and feeders, providing coordinated protection for motors, drives, and other three‑phase equipment.

Why this matters for your electrical system

The HLL36125 is more than a breaker—it's a guardrail for your electrical infrastructure. The molded case design dissipates heat efficiently, helping maintain stable trip performance under varying load conditions. The thermal‑magnetic trip mechanism reacts quickly to short circuits while offering reliable overload protection, reducing the risk of equipment damage and protecting downstream devices like motors, lighting, and control panels.

Use cases and applications

• Protect 3‑phase feeders feeding motor starters, pumps, fans, and HVAC equipment in light commercial and industrial settings.
• Install in panelboards where space efficiency and reliable protection are priorities, such as electrical closets, service panels, and utility rooms.
• Ideal replacement for aging or undersized breakers in compatible Square D panels, helping to restore protection to critical circuits.

Technical specifications at a glance

• Manufacturer: Square D
• Part Number: HLL36125
• Type: Thermal‑magnetic molded case circuit breaker
• Amperage Rating: 125 A
• Voltage Rating: 600 V
• Number of Poles: 3
• Application: Branch circuit overcurrent and short‑circuit protection

Installation and compatibility notes

Designed to pair with matching OEM Square D load centers and panelboards, this 3‑pole unit fits standard 3‑phase distribution setups and simplifies maintenance with familiar Square D interfaces. Before installation, verify that your panel is rated for 600 V and that a 3‑pole device aligns with the circuit layout you intend to protect. For best results, use only in panels that specify compatibility with HLL series molded‑case breakers to ensure correct bus contact, torque, and trip coordination.

When you choose the Square D HLL36125, you’re selecting a rugged, purpose‑built solution that aligns with professional electrical standards and long‑term reliability. It’s a practical, ready‑to‑wire option for safeguarding critical circuits in a variety of environments, backed by Square D’s reputation and AmpState’s commitment to supplying dependable protective devices.