Siemens | EF3B040 | Circuit Breaker | 40A | 3-Pole | 600V

The Siemens EF3B040 Circuit Breaker is a dependable protection solution designed for three-phase electrical systems. With a 40A rating and a 600V maximum, it delivers reliable overcurrent protection while fitting into Siemens-compatible panels and configurations. This unit is ideal for maintenance, retrofit, and replacement tasks where exact specifications matter, ensuring you keep critical equipment safeguarded and online.

Key selling points

• Exact part reference: EF3B040 is the best compatibility reference for replacements, reducing guesswork and ensuring a proper fit.
• 3-pole design: Provides balanced protection across all three phases, essential for three-phase distribution and equipment protection.
• 600V rating: Suitable for industrial environments that operate at higher voltage levels, delivering dependable interruption when needed.
• Maintenance and retrofit ready: A straightforward option for upgrading or refreshing existing Siemens-based electrical systems.
• Clear identification: Explicit amperage (40A) and configuration help quick verification during installation or inventory checks.

Specifications at a glance

• Amperage: 40A
• Poles: 3-Pole
• Voltage: 600V

Practical use cases

Use this breaker for routine maintenance in service or distribution panels, retrofitting older installations to modern 3-pole 600V protection, or replacing wear-prone components in Siemens-compatible equipment. It’s well-suited for facilities that rely on consistent, predictable circuit protection for three-phase loads.

Ordering with confidence

Notes: Confirm fit and ratings before ordering. The part number EF3B040 serves as the most reliable reference to ensure compatibility with your panel or distribution setup.