Siemens HMX3R800L 800A 3-Pole 600 V Circuit Breaker

Engineered by Siemens, the HMX3R800L is a heavy-duty circuit breaker built for reliability in 600 V environments. With an impressive 800 A current rating, 3-pole configuration, and a voltage rating of 600 V, this unit delivers robust protection for high-demand electrical feeders and main distribution panels.

Part Number: HMX3R800L — when a Siemens part is required for compatibility and enduring performance, this breaker slots into standard Siemens enclosures and switchgear designed for three-phase protection.

• Current rating: 800 A
• Poles: 3 (three-phase protection)
• Voltage rating: 600 V
• Part number: HMX3R800L

Practical applications and benefits

Ideal for industrial facilities, data centers, and manufacturing environments where a single device must safeguard three hot legs. The 3-pole configuration ensures all phases trip together, reducing the risk of phase-to-phase faults that can damage motors, drives, and sensitive equipment.

Use cases include main service protection in 600 V distribution boards, motor control centers, and panel boards where a reliable, high-current breaker is required to interrupt fault currents and safeguard downstream components.

What sets this Siemens breaker apart

• Genuine Siemens engineering: Built to harmonize with Siemens panels and accessories, ensuring smooth replacement and consistent electrical performance.
• High-current protection: Ready for demanding loads up to 800 A, making it suitable for main feeders and heavy-duty circuits.
• Three-phase integrity: Simultaneous trip across all three poles minimizes risk during faults and improves overall protection strategy.

Installation tip: verify enclosure compatibility for the HMX3R family and ensure any required mounting accessories are available. As with all protective devices, adopt proper torque and wiring practices per Siemens installation guidelines to maintain clamping force and insulation integrity.