Siemens B330 - 30A, 240VAC, 3-Pole, Miniature Circuit Breaker (MCB)

The Siemens B330 30A, 240VAC, 3-Pole Miniature Circuit Breaker (MCB) delivers dependable overcurrent protection for three-phase electrical systems. With a 30-amp rating at up to 240 volts, this compact device is engineered to safeguard distribution panels, switchboards, and control panels in demanding environments.

Designed for industrial, commercial, and OEM applications, the B330 helps prevent damage from overloads and short circuits while supporting safe operation and quick resets after trips. Its three-pole design provides synchronized protection across all phases, making it an ideal choice for balanced 3‑phase networks found in motor control centers and complex panel setups.

Key specifications

• Current rating: 30A
• Voltage rating: 240VAC
• Poles: 3-Pole
• Breaker type: Miniature Circuit Breaker (MCB)

Why the B330 stands out

Unlike general-purpose breakers, the B330 is tailored for 3‑phase protection in environments where continuous operation and quick fault isolation matter. Its triple-pole configuration ensures that a fault in one phase does not compromise the entire circuit, helping minimize downtime and extending the life of connected equipment in motor drives, feeders, and control gear. Built to perform reliably in panelboards, switchboards, and control panels, this MCB integrates smoothly into Siemens ecosystems and OEM assemblies that demand consistent protection performance.

Ideal applications

• Three-phase motor circuits in industrial facilities
• Power feeders in distribution panels and switchboards
• Control panels in manufacturing equipment and OEM installations
• Commercial electrical distribution where compact, robust protection is required

Practical tips for installation and use

• Verify that the panel or enclosure is rated for 240VAC and can accommodate a 3-pole MCB of 30A rating.
• Use in applications where coordinated protection across all three phases is essential to prevent unbalanced faults.
• Replace like-for-like within Siemens protection schemes to ensure compatibility with existing trip characteristics and wiring practices.
• Consider the B330 for OEM equipment where reliable, field-serviceable overcurrent protection reduces downtime and simplifies maintenance.

Choose the Siemens B330 30A 240VAC 3-Pole MCB for steadfast, three-phase protection in distribution panels and motor control centers—delivering clarity of protection, straightforward replacement, and seamless integration with Siemens electrical systems.