Square D 9999RB34 Circuit Breaker, 30A, 1-Pole, 347V

Meet the Square D 9999RB34 Circuit Breaker — a rugged, industrial-grade protection device engineered for demanding electrical service, maintenance, and replacement projects. With a 30‑amp rating, a single pole, and a 347‑volt operating range, this breaker delivers dependable interruption of fault currents in commercial and industrial distributions. Confirm compatibility by the part number 9999RB34 and your specific application requirements to ensure a precise fit.

Key specifications

• Manufacturer: Square D
• Part Number: 9999RB34
• Product Type: Circuit Breaker
• Amperage: 30 A
• Poles: 1
• Voltage: 347 V

What makes this breaker uniquely suited for industrial needs

• Designed for high-demand electrical service, maintenance, and replacement tasks in environments where 347V distribution is common.
• Single-pole protection provides focused safeguarding for individual circuits without impacting adjacent feeders.
• 30A rating gives precise protection for medium-load branches, helping to prevent overcurrent damage while minimizing unnecessary interruptions.
• Part-number specificity (9999RB34) helps ensure you select the exact device compatible with your panelboard and wiring scheme.

Ideal use cases

• Upgrading aging protection on 347V industrial feeders and machines in manufacturing or facilities operations.
• Replacement in service panels and distribution gear that rely on Square D components for consistent performance.
• Situations requiring reliable, single-pole interruption to protect a dedicated circuit without affecting broader system operations.

Compatibility & installation guidance

To ensure a perfect fit, verify the device using the part number 9999RB34 against your equipment catalog and application requirements. If you’re unsure about compatibility or fit, message us and we’ll help you confirm whether this exact part meets your panel, voltage, and circuit protection needs. Always follow proper electrical safety protocols: shut off power at the main disconnect, verify voltage with a meter, and install only in panels that support the 1‑pole, 347V configuration.