Square D HLL36125SN 125A 3-Pole 600 V Circuit Breaker

Meet the Square D HLL36125SN — a purpose-built protection device designed to keep industrial power systems safe and uninterrupted. This 125 A, 3-pole circuit breaker delivers reliable overcurrent protection for demanding 600 V applications, helping protect equipment and maintain steady operations.

Key features that matter in real-world setups

• 125 A current rating provides robust protection for heavy feeders and motor circuits while minimizing nuisance trips.
• 3-pole design ensures synchronized interruption across all three conductors for balanced three-phase protection.
• 600 V voltage rating supports higher-voltage distribution in industrial environments, delivering dependable fault interruption when it counts.
• Part number HLL36125SN offers precise compatibility for replacements and stocking, simplifying procurement and maintenance.
• Square D engineering brings a trusted track record of performance, reliability, and compatibility with standard Square D enclosures and wiring practices.

Practical applications

This model is well-suited for industrial control panels, manufacturing lines, and power distribution boards that run on three-phase, 600 V systems. Use it to protect feeders, motor circuits, and other critical loads where dependable interruption is essential to prevent damage and downtime. If you’re upgrading older protection devices or stocking parts for routine maintenance, the HLL36125SN aligns with Square D specifications for straightforward installation and service.

Why this model stands out

• Specifically rated for 125 A, 3-pole, and 600 V operation, aligning with common industrial three-phase circuits.
• Directly sourced from Square D to preserve system compatibility and simplify maintenance records.
• Designed for predictable trips, helping minimize downtime and safeguard downstream equipment from overcurrent and short-circuit faults.

Installation and maintenance tips

Before replacing, confirm that your panel and circuit ratings match 125 A, 3-pole, and 600 V. Follow the panel’s installation manual for proper mounting, wiring, and terminal torque. Update labeling to reflect the new protection device, and perform routine inspections as part of your preventive maintenance program to ensure reliable operation over time.

Specifications at a glance

• Current rating: 125 A
• Poles: 3
• Voltage rating: 600 V
• Part number: HLL36125SN
• Brand: Square D