Siemens MND63 1200A 3P 600V Circuit Breaker, NEMA 3R | AmpState

The Siemens MND63 1200A 3P 600V Circuit Breaker, NEMA 3R, from AmpState, is engineered to deliver steadfast overcurrent protection for critical electrical distribution setups. Built for reliability in both indoor panelboards and outdoor-rated environments, this three-pole device keeps your three-phase systems safe and running smoothly.

Why this breaker stands out

• Three-pole, 1200 A rating: Designed to interrupt substantial fault currents in three-phase networks, helping prevent damage to equipment and reduce downtime.
• 600V maximum operating voltage: Suited for common industrial and commercial distribution requirements, providing robust protection where it matters most.
• NEMA 3R enclosure suitability: Built to withstand outdoor and exposed environments when installed in the appropriate enclosure, offering dependable performance in varied conditions.
• Part number consistency for retrofit: The MND63 line is selected to stay the same part number, making replacements and maintenance planning straightforward and minimizing compatibility concerns during upgrades or repairs.
• Panelboard and load center protection: Ideal for safeguarding electrical distribution in control rooms, factories, and facilities where uninterrupted service is critical.

Key specs at a glance

• Manufacturer: Siemens
• Part number: MND63
• Product type: Circuit Breaker
• Amperage: 1200 A
• Poles: 3
• Voltage: 600 V
• Enclosure rating: NEMA 3R

Who benefits from this module

• Facility engineers planning retrofits who need to maintain a consistent part number for ease of sourcing and stocking.
• Electricians and maintenance teams responsible for panelboard and load center protection in industrial or commercial installations.
• Project managers seeking reliable, field-proven protection for distributions without redesigning electrical layouts.

Assurance and support

Available from AmpState, this MND63 model is backed by our know-how in matching part numbers and confirming compatibility for your specific installation. If you’re unsure about fit or need confirmation for a retrofit, we’re ready to help ensure the MND63 is the right choice for your panelboard or distribution needs—without unnecessary delays.

Designed for durability, ease of use, and predictable performance, the Siemens MND63 1200A 3P 600V Circuit Breaker brings trusted Siemens protection to your electrical distribution system—and it’s readily accessible from AmpState to support your ongoing maintenance and retrofit projects.