Siemens MBR9302 - 2000 A, 600 V Bolt-On Circuit Breaker | AmpState

Meet the Siemens MBR9302, a high-capacity bolt-on molded case circuit breaker engineered for dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. With a robust 2000 A rating at 600 V, this breaker is built to handle demanding electrical setups while delivering precise, repeatable protection performance.

Why the MBR9302 stands out

• Secure bolt-on mounting: ensures a rigid, vibration-resistant bus connection that maintains consistent contact pressure for reliable operation in challenging environments.
• Thermal-magnetic trip unit: combines thermal overload protection with instantaneous magnetic tripping, delivering stable protection curves and fast fault interruption when it matters most.
• High-current capability: 2000 A at 600 V makes it ideal for large branch circuits, feeders, and critical load paths in panelboards and distribution gear.
• OEM-compatible: designed to pair with matching Siemens OEM load centers and panelboards, simplifying replacement, maintenance, and system coordination.
• Versatile across sectors: suitable for residential, commercial, and light industrial applications where dependable overcurrent and short-circuit protection is essential.

Ideal use cases and scenarios

Use the MBR9302 to protect heavy feeders in main distribution panels, safeguard large motor circuits, or secure critical branches in multi-tenant buildings. Its bolt-on design is particularly advantageous for panel upgrades or retrofits where a secure, vibration-resistant connection is critical, reducing the risk of loose contacts that can lead to nuisance trips or degraded protection.

Better protection, easier maintenance

Compared to smaller or non-bolt-on breakers, the MBR9302 provides a more durable bus connection and superior resistance to vibration-induced wear. Its thermal-magnetic trip behavior offers predictable response across temperature variations, helping facility teams plan preventive maintenance with confidence and minimize unexpected outages.

Specification snapshot

• Manufacturer: Siemens
• Part Number: MBR9302
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 2000 A
• Voltage Rating: 600 V
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection