Siemens | KM3B300 | Circuit Breaker | 300A | 3-Pole | 600V | 50kA | Bolt-On

The Siemens KM3B300 Circuit Breaker is a robust three‑pole protection device designed for reliable power distribution in industrial and commercial settings. With a 300 A rating, 600 V maximum, and a 50 kA interrupt capacity, it delivers dependable protection for demanding electrical feeders. The bolt‑on mounting makes field installation straightforward, enabling swift maintenance, retrofit, or replacement without extensive panel modification.

Specifications at a glance

• Amperage: 300 A
• Poles: 3-Pole
• Voltage rating: 600 V
• Interrupting capacity: 50 kA
• Mounting: Bolt-On
• Part number: KM3B300

Why this KM3B300 stands out

• Exact spec alignment for maintenance, retrofit, or replacement in compatible Siemens electrical systems, reducing guesswork and ensuring reliable protection on refitted panels.
• Three‑phase protection with a bolt‑on footprint that simplifies installation and minimizes downtime during service events.
• High 50 kA interrupt rating equips you to handle fault currents common in motors, pumps, and large feeders without compromising safety or performance.
• Durable construction designed for industrial environments, delivering consistent performance across temperature and vibration conditions typical in commercial facilities.
• Part of the Siemens KM3B family, offering a seamless path for legacy systems and future upgrades where exact compatibility matters most.

Ideal use cases

• Maintenance, retrofit, or replacement on existing Siemens panels that require KM3B300 specifications.
• Three‑phase feeders in manufacturing lines, HVAC motor centers, or power distribution for data processing rooms where reliability is critical.
• Facilities planning upgrades to higher fault‑current environments, ensuring continued protection without changing the panel architecture.

Installation and compatibility tips

• Always confirm fit and ratings before ordering. The KM3B300 is your best reference for compatibility with existing Siemens equipment.
• Verify panel labeling and footprint to ensure bolt‑on mounting aligns with your enclosure and bus bar configuration.
• During installation, follow standard electrical safety practices and torque specifications for mounting hardware to maintain protective integrity.
• Use as a precise replacement in systems currently configured for KM3B300 or compatible KM3B series breakers to avoid mismatches in trip curves and wiring terminations.