Siemens | BQD6340 | Circuit Breaker | 40A | 3-Pole | 347V

Meet the Siemens BQD6340 Circuit Breaker — a robust 40-amp, 3-pole protection device engineered for 347V three-phase systems. Built to support maintenance, retrofit, and replacement projects, it helps keep critical equipment safeguarded and your electrical system running smoothly.

Key specifications

• Amperage: 40A
• Poles: 3-Pole
• Voltage: 347V
• Part number reference: BQD6340

What makes this breaker stand out

• Three-pole design ensures simultaneous disconnection of all phases during a fault, protecting equipment and improving safety in industrial power distributions.
• 347V compatibility aligns with common commercial and industrial 3-phase networks, reducing the complexity of panel upgrades or replacements.
• Designed for practical maintenance, retrofit, and replacement work, it simplifies upgrading aging panels without sacrificing reliability.
• The BQD6340 part number is the most reliable reference for compatibility—keep it handy when matching panels, accessories, or spare parts.

Ideal use cases

Perfect for facilities and service teams upgrading or maintaining 3-phase distribution boards that operate at 347V. Use cases include:

• Retrofit projects in aging switchgear to restore compliant protection on 347V, 3-phase circuits.
• Maintenance replacements where a verified, like-for-like 40A, 3-pole device is required to minimize downtime.
• Panel modernization efforts that prioritize consistent Siemens components for easier stocking and service.

Compatibility and ordering tips

Before purchasing, always verify fit and ratings on the panel label and ensure they align with the device’s specs. For accurate compatibility, rely on the part number BQD6340 as your primary reference during procurement and cross-check with your existing breakers and panel documentation.

Installation and best practices

• Power down the equipment and follow lockout/tagout procedures before handling the breaker.
• Confirm the system is a 347V three-phase setup and that the panel is rated for 40A protection per the circuit design.
• Use proper tools and adhere to standard installation practices for circuit breakers in Siemens panels, ensuring secure connections and clean terminations.
• Label the new breaker clearly and update maintenance records to reflect the exact part number (BQD6340) for future servicing.