Siemens | E43B045 | Circuit Breaker | 45A | 3-Pole | 480V

Meet the Siemens E43B045 Circuit Breaker — the trusted protection solution for demanding 3‑phase electrical systems. Engineered to deliver reliable overcurrent protection in industrial and commercial environments, this 45A, 3‑pole device is rated for up to 480V, making it ideal for modern 3‑phase installations.

Key specifications:

• Amperage: 45A
• Poles: 3‑Pole
• Voltage rating: 480V
• Part number: E43B045

Why choose the Siemens E43B045 for your system?

• Compatible with Siemens panels and switchgear that specify the E43 series or the E43B045 part number, serving as a precise replacement or retrofit component.
• Designed for reliable operation in 3‑phase power distribution, protecting motors, feeders, and control circuits from overloads and short circuits when properly installed.
• Proven Siemens construction with a track record of durable performance in maintenance or emergency replacements.

Use cases and scenarios

• Maintenance and retrofit projects where a direct match to existing equipment is required.
• Spare parts inventory for industrial facilities running 3‑phase equipment rated at 480V.
• Replacement in manufacturing lines, data centers, or facility power distribution where consistent 3‑phase protection is essential.

How to verify fit and ratings before ordering

• Cross-check the part number E43B045 against your panel labeling and equipment documentation.
• Ensure your system voltage and the downstream devices (motors, feeders) align with a 480V, 3‑pole protection device.
• Follow local electrical codes and hire a licensed electrician to perform the installation and testing.

Practical installation tips

• Turn off power and lockout/tagout the circuit before replacement.
• Use appropriate torque settings for mounting and terminal connections as specified by Siemens documentation.
• Test the circuit after installation to confirm proper tripping behavior and system protection.

Notes: Confirm fit and ratings before ordering. The part number is the best reference for compatibility, ensuring you are matching the correct 45A, 3‑pole, 480V device for your application.