Siemens HEM3M100L 100A 3-Pole 480 V Circuit Breaker

Meet the Siemens HEM3M100L 100A 3-Pole 480 V Circuit Breaker — a purpose-built protection device for demanding 480V three-phase power systems. Designed to safeguard industrial and commercial electrical distributions, this breaker delivers reliable, coordinated performance when it matters most.

Key specifications

• Current rating: 100 A
• Poles: 3
• Voltage rating: 480 V
• Part number: HEM3M100L

Why this Siemens HEM3M100L stands out

• Reliable three-phase protection: The three-pole design ensures simultaneous disconnection of all phases, reducing damage risk to motors, drives, and downstream equipment during faults.
• Thermal-magnetic trip mechanism: Balances fast response to short circuits with dependable overload protection, minimizing downtime and protecting valuable assets.
• Optimized for 480V industrial networks: Built to handle the common voltages found in manufacturing, processing, and large facilities, delivering consistent performance under real-world loads.
• Direct fit and clear compatibility: Part number HEM3M100L aligns with Siemens panels and MCCBs, simplifying installation, replacements, and maintenance planning.
• Durable, long-term reliability: Siemens-quality construction and standardized design reduce nuisance trips and extend service life in challenging environments.

Use cases & ideal customers

This breaker is ideal for facilities with 480V three-phase feeders, including:

• Factory floors with motor control centers and heavy machinery
• Industrial automation panels, switchgear, and distribution boards
• Electrical rooms in large commercial or institutional buildings with high-voltage feeders

Practical tips for installation and operation

• Match the breaker’s 100 A rating to your circuit load and conductor sizing to ensure safe, protected operation.
• Use appropriate protective accessories and wiring methods specified for 480V systems in conjunction with Siemens protection devices.
• Schedule routine inspection of terminations and mounting to maintain reliable trip performance and minimize overheating risk.

Why choose Siemens for circuit protection

Siemens brings a legacy of dependable electrical protection and industry-specific solutions. The HEM series, including the HEM3M100L, offers a balanced combination of performance, compatibility, and ease of replacement—making it a prudent choice for ongoing reliability in industrial environments.