Siemens ED43B040 - 40A, 3-Pole, Circuit Breaker

Siemens ED43B040 is a purpose-built 40A, 3-pole circuit breaker engineered for demanding industrial, commercial, and OEM environments. Built to deliver dependable overcurrent protection in distribution panels and motor control centers, this breaker keeps critical systems safe while helping your panels operate with confidence.

Key reasons to choose the ED43B040 for your three-phase applications:

• Three-pole protection for 3-phase systems — This design protects all three phases simultaneously, reducing the risk of phase imbalance and ensuring consistent motor and equipment protection.
• 40 A current rating — Ideal for mid-range loads and motor circuits where precise protection and selectivity matter, helping to prevent nuisance trips while safeguarding conductors and devices.
• Versatile installation in panelboards, switchboards, and control panels — The ED43B040 is suited for a wide range of distribution and control architectures, making it a practical choice for both new builds and replacements in modern facilities.
• Reliable overcurrent protection — Designed for steady performance in challenging environments, delivering predictable response when current exceeds safe levels to protect wiring and connected equipment.
• Siemens ecosystem compatibility — Integrates smoothly with existing Siemens protection schemes and spare-parts networks, helping you maintain consistency across your electrical infrastructure.

Use cases you’ll appreciate

• Motor control centers and three-phase machines where balanced protection across all phases is essential
• Distribution panels supplying mid-range industrial loads, conveyors, and processing equipment
• Commercial or OEM equipment that relies on robust, predictable circuit protection for uptime and safety

The ED43B040 stands out by combining a practical 3-pole design with a straightforward 40A rating, delivering a streamlined solution for protecting three-phase circuits without overcomplicating panel layouts. In real-world terms, it means fewer trips due to imbalance, quicker fault isolation, and cleaner coordination with upstream and downstream protection devices.

What you get with this Siemens breaker

• A rugged, reliable 40A, 3-pole circuit breaker ready for industrial-duty service
• Clear, easy-to-read ratings and labeling to simplify panel documentation and maintenance
• Compatibility with Siemens protection practices, ensuring smooth integration into existing electrical designs

If you’re upgrading a panel, wiring a new MCC, or stocking spare parts for OEM equipment, the Siemens ED43B040 delivers the performance and reliability you expect from a trusted name in power protection. It’s not just a breaker—it’s a core component that helps keep motors running, panels safe, and systems achieving steady, predictable operation.