Siemens ED43B045L - 45 A, 480 V, 3-Pole Circuit Breaker | AmpState

Meet the Siemens ED43B045L — a 45A, 480V, 3-pole molded case circuit breaker engineered for reliable branch circuit protection in panelboards and load centers. Built to handle the demands of modern 3-phase electrical systems, this unit combines compact sizing with precise protection to keep critical circuits safe and maintainable.

• Space‑efficient design: Compact molded case construction maximizes panel real estate, helping you fit more circuits without upgrading enclosure footprint.
• Thermal‑magnetic trip unit: Delivers stable, repeatable protection by coordinating long-term overcurrent response with fast short‑circuit disconnection, reducing nuisance trips and downtime.
• OEM compatibility: Designed to be directly compatible with matching Siemens OEM load centers and panelboards for straightforward installation and dependable performance.
• Versatile applications: Suitable for residential, commercial, and light industrial environments where robust 3‑phase protection is required.

Technical specifications

• Manufacturer: Siemens
• Part Number: ED43B045L
• Type: Thermal‑magnetic molded case circuit breaker
• Amperage Rating: 45A
• Voltage Rating: 480V
• Number of Poles: 3
• Application: Branch circuit overcurrent and short‑circuit protection

Why this matters in real-world installations

In commercial and light industrial settings, cleanly protecting three‑phase feeders is crucial. The ED43B045L is purpose-built to guard the circuits that feed motors, HVAC systems, lighting panels, and power distribution blocks, while occupying minimal panel space. Expect:

• Reliable protection for 3‑phase motors and equipment: The 480V rating aligns with typical commercial power distribution, helping prevent costly faults from propagating through the system.
• Efficient panel planning: The compact form factor leaves room for future expansion or reconfiguration without upgrading the entire panel.
• Consistent performance: The thermal‑magnetic mechanism provides predictable trip behavior across varying loads and temperatures, aiding in smoother maintenance planning.

Compatibility, installation and practical tips

To maximize reliability, pair the ED43B045L with Siemens OEM panelboards and load centers designed for 480V, three‑pole molded case breakers. Before installation, confirm that your panelboard listing supports 3‑pole devices of this rating, and follow standard electrical practices for torque, clearance, and safe handling. This breaker is ideal for feeders and branch circuits in environments where space optimization and dependable protection are paramount.

Equip your distribution system with the Siemens ED43B045L for precise overcurrent protection, streamlined panel layout, and long‑term protection against short circuits — all backed by Siemens’ engineering legacy and the practical reliability your installations rely on.