Siemens LMX3T800 800A 3-Pole 600 V Circuit Breaker

Meet the Siemens LMX3T800 800A 3-Pole 600 V Circuit Breaker — a purpose-built solution for reliable overcurrent protection in demanding three‑phase power systems. With an 800 A current rating and a true three-pole configuration, this unit interrupts fault currents across all phases, safeguarding motors, transformers, feeders, and the broader power distribution network in industrial panels and switchgear.

Part Number: LMX3T800 • Current rating: 800 A • Poles: 3 • Voltage rating: 600 V

Why choose the LMX3T800 in your electrical infrastructure?

• Designed to work within Siemens panels, enclosures, and accessories, delivering consistent performance and easier maintenance across the system.
• The 3-pole design provides synchronized interruption across all phases, helping prevent equipment damage from phase imbalances and short circuits.
• Rated for typical industrial distributions, enabling robust protection without overloading components or under-protecting feeders.

Ideal use cases

• Main protection in industrial control panels and switchgear where three‑phase power is distributed
• Protection for three‑phase feeders feeding motors, pumps, conveyors, and transformers
• Service disconnects in commercial or industrial facilities requiring reliable, field-proven protection
• Backbone protection in power distribution setups that rely on Siemens equipment and parts

What problems does it solve?

• Prevents equipment damage by promptly interrupting fault currents across all three phases
• Helps minimize downtime with predictable trip behavior and easy replacement within the Siemens ecosystem
• Provides a scalable protection solution for growing industrial installations and complex distribution networks

Practical deployment tips

• Verify that your system operates within the 600 V rating and that conductors and accessories are sized to handle 800 A safely.
• Coordinate protection with upstream devices to achieve selective isolation and reduce unnecessary outages.
• Use compatible Siemens enclosures and mounting hardware to ensure proper fit, thermal performance, and reliable operation.
• During installation, follow standard electrical safety practices and panel manufacturer torque specifications for mounting hardware.