Siemens E43A040 Circuit Breaker, 40A, 3-Pole, 480V

Siemens E43A040 Circuit Breaker — a rugged, three-pole protection solution designed for demanding industrial electrical service, maintenance, and replacement projects. With a 40 A rating and 480 V operating capability, this breaker helps keep three-phase systems safe and reliable in real-world plants and facilities.

Key specifications

• Manufacturer: Siemens
• Part Number: E43A040
• Product Type: Circuit Breaker
• Amperage: 40 A
• Poles: 3
• Voltage: 480 V

Why this Siemens breaker stands out

Designed for industrial environments, the E43A040 delivers dependable protection across all three phases in 480V systems. The 3-pole configuration ensures balanced interruption and coordinated protection for motor drives, panel distributions, and essential equipment — reducing the risk of partial faults and downtime.

Compatibility and fit verification

Use the part number E43A040 to confirm compatibility with your specific panel or equipment. Verify fit by part number and application requirements to ensure seamless replacement or integration into your existing electrical layout.

Ideal use cases

• New industrial installations requiring reliable 3-phase protection at 480V
• Panel upgrades or retrofits in manufacturing, processing, or automation environments
• Maintenance cycles and swift replacement of worn breakers to minimize downtime

Practical tips for installation and use

• Before installation, power down the service and confirm all circuit connections match the three-phase configuration
• Consult your electrical diagrams to ensure the 3-pole, 480V rating aligns with the protected load
• Handle the device with standard safety practices for high-voltage components

Support and compatibility help

Need help matching a part number or confirming compatibility with your system? Message us and we’ll assist in verifying fit and suitability for your application.