Siemens LMXD63B700 - 700 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens LMXD63B700 — a high-capacity, bolt-on molded case circuit breaker built for serious branch-circuit protection in panelboards and loadcenters. With a robust 700 A rating at 600 V and a 3-pole design, this device is engineered to handle demanding electrical systems while delivering precise, reliable protection when faults occur.

• Secure bolt-on mounting: A rigid connection that resists vibration and movement, preserving a dependable bus interface in busy panels and harsh environments.
• Thermal-magnetic trip unit: Combines slow, predictable thermal overload protection with fast magnetic tripping for short-circuits, ensuring stable protection and swift fault clearance.
• OEM-compatible: Precisely matched to Siemens load centers and panelboards, promoting clean installation, proper coordination, and ease of replacement.
• Versatile for multiple sectors: Ideal for residential, commercial, and light industrial applications where high-current protection is essential and space is at a premium.

Technical snapshot

• Manufacturer: Siemens
• Part Number: LMXD63B700
• Type: Thermal-magnetic molded case circuit breaker (MCCB)
• Amperage Rating: 700 A
• Voltage Rating: 600 V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection for panels and load centers

Practical use cases

• Upgrade or retrofit existing panelboards to safeguard large-draw feeders and service-disconnect circuits with a single, reliable device.
• In commercial settings such as offices, retail spaces, or data closets, ensure simultaneous disconnection of all conductors during faults for enhanced safety.
• In light-industrial environments with equipment like HVAC, conveyors, or motors, the bolt-on design provides robust mechanical stability in vibration-prone installations.

Why this matters

• The 700 A capacity at 600 V is designed to handle high-current circuits while minimizing nuisance trips, helping reduce downtime and protect equipment.
• The combination of bolt-on mounting and a thermal-magnetic trip unit delivers both mechanical durability and precise electrical protection, supporting longer service life and fewer maintenance interruptions.

Tips for installation and use

• Verify your panelboard is compatible with 700 A, 3-pole bolt-on breakers and that LMXD63B700 matches the OEM specifications for your Siemens-compatible load center.
• Secure the breaker thoroughly to maintain a solid bus connection, especially in environments with ongoing vibration or frequent cycling.
• Consider coordination with upstream protection devices to optimize selectivity and safety across the distribution system.