Siemens | MD63B800L | Circuit Breaker | 800A | 3-Pole

Meet the Siemens MD63B800L circuit breaker—a purpose-built, 800 A, 3-pole device engineered for demanding three‑phase electrical systems. Ideal for maintenance, retrofit, and replacement projects, this unit is designed to slot into Siemens panels where exact specifications matter, ensuring reliable protection and streamlined serviceability.

Key specifications

• Amperage: 800 A
• Poles: 3-Pole
• Part reference: MD63B800L

Compatibility and fit

For best results, confirm fit and ratings before ordering. The part number MD63B800L is the best reference for ensuring you match the exact breaker to your Siemens panel and application.

What makes this Siemens breaker different

• Designed to integrate with Siemens panels, leveraging the same mounting and trip characteristics to minimize retrofit complications.
• Three-pole configuration provides synchronized protection across all phases in 3‑phase circuits, helping prevent unbalanced loads and equipment damage.
• Single, clearly identified part number simplifies inventory and replacement planning, reducing downtime during service windows.

Ideal applications

• Industrial facilities with 3‑phase motor loads, heavy machinery, conveyors, or large power distribution needs requiring 800 A main protection.
• Retrofits and upgrades to replace aging or failed breakers within existing Siemens panels, preserving system integrity.
• Spare parts strategy for service teams that prioritize exact-part compatibility and rapid deployment in critical infrastructure.

Practical tips for installation and maintenance

• Have your panel model and electrical ratings on hand to validate compatibility and avoid mismatches.
• Keep a certified MD63B800L in stock for quick, reliable replacements in time‑sensitive maintenance scenarios.
• Follow Siemens installation guidelines and torque specifications to ensure a secure connection and optimal protective performance.

Choosing the Siemens MD63B800L means selecting a purpose-built, high‑reliability circuit breaker that aligns with Siemens panels and three‑phase systems. It’s the clear choice for technicians who demand exact part compatibility, straightforward maintenance, and dependable, three‑phase protection.