Siemens - Marq 21 - Breaker MCC Bucket - 300 A, 480 V, 30" Height, 3 P | AmpState

Introducing the Siemens Marq 21 Breaker MCC Bucket — a purpose-built module for industrial motor control centers that demands a sturdy 300 A, 480 V, 3-Pole configuration within a 30" tall frame. Crafted for the Siemens Marq 21 MCC lineup, this bucket serves as a dependable OEM replacement and a ready-to-retrofit solution for upgrading existing cabinets.

Direct-fit compatibility for Marq 21

Designed to integrate seamlessly with Siemens Marq 21 MCC assemblies, the bucket maintains exact form-fit and electrical alignment. It enables straightforward replacement without redesigning adjacent compartments, minimizing downtime and preserving bus-bar, switchgear, and accessory interfaces.

Key specifications

• Current rating: 300 A
• Voltage rating: 480 V
• Pole configuration: 3-Pole
• Bucket height: 30 inches
• Series: Siemens Marq 21
• Application: Breaker MCC bucket for motor control centers
• Use: OEM replacement and retrofit within Marq 21 MCC lineups

Why this matters in your plant

When you operate large motors and heavy-duty drives, you need a control component you can trust. The 300 A, 480 V, 3-Pole breaker bucket delivers robust interrupt capability and reliable fault isolation within 30" bays, ensuring consistent motor control, safe energization, and easier maintenance. Because it’s built specifically for the Marq 21 platform, you gain predictable performance and compatibility with existing cabling, bus, and accessory layouts.

Ideal use cases

• OEM replacement in aging Marq 21 MCC installations
• Retrofit projects upgrading to current Siemens components while preserving cabinet architecture
• New builds or plant expansions that adopt the Marq 21 MCC standard
• Industrial environments with conveyors, pumps, fans, or large motors that require reliable 3-Pole protection at 480 V

Why choose AmpState

AmpState sources genuine Siemens MCC components with global availability, ensuring you can source this Marq 21 Breaker MCC Bucket when you need it most. Using authentic parts minimizes compatibility issues and extends the life of your motor control center.

Installation and maintenance notes

Before installation, verify the bucket height, 3-Pole configuration, and 480 V rating align with your Marq 21 rack. Follow Siemens installation guidelines for mounting, bus-bar connections, and safety interlocks. Schedule downtime, use proper PPE, and have trained personnel perform the swap to maintain system integrity and plant safety.