Siemens | KMB3B800 | Circuit Breaker | 800A | 3-Pole | 600V | 30kA | Bolt-On

Meet the Siemens KMB3B800 circuit breaker — a robust, bolt-on, three‑pole protection device engineered for demanding electrical systems. With an 800 A capacity, 600 V rating, and a 30 kA interrupting capacity, this breaker is built to reliably guard feeders and distribution panels in busy industrial and commercial environments. Designed for maintenance, retrofit, and replacement projects, it fits where matching specs are essential and downtime needs to be minimized.

Key specifications

• Amperage: 800 A
• Poles: 3-pole
• Voltage: 600 V
• Interrupting rating: 30 kA
• Mounting: Bolt-On
• Part number: KMB3B800

What sets it apart

This Siemens breaker is purposefully designed to align with existing Siemens protection schemes, ensuring consistent trip characteristics and coordination across your power distribution. The bolt-on mounting streamlines installation and replacement, reducing panel downtime while delivering dependable protection across all three phases. With a focus on real-world scalability, it supports high-current applications up to 800 A without compromising safety or performance.

Ideal use cases

• Maintenance and retrofit projects that require exact spec matching to minimize changes to the panel layout
• Replacement of aging protection devices in commercial and industrial panels
• Feeder protection for 600 V distribution circuits in data centers, manufacturing facilities, and large facilities

Buying guidance and compatibility

To ensure a precise fit, verify that the KMB3B800’s ratings align with your panel and system requirements before purchasing. The part number is your strongest reference for compatibility, providing a clear, unambiguous match to Siemens’ bolt-on, 800 A, 3-pole, 600 V, 30 kA circuit breakers.