Siemens ED43B125L - 125 A, 480 V, 3-Pole Circuit Breaker | AmpState

Siemens ED43B125L is a 125A, 480V, 3-pole molded case circuit breaker designed to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers.

The compact molded case design maximizes usable panel space, making it an efficient choice for installations where space is at a premium. Its thermal-magnetic trip unit delivers stable, repeatable protection performance, ensuring fast, reliable response to overloads and short circuits across a range of operating conditions. This means fewer nuisance trips and more consistent protection for your electrical system.

• 3-pole, 125A, 480V configuration for three-phase circuits common in commercial and light industrial environments.
• Thermal-magnetic trip mechanism provides balanced protection against both overloads and short circuits, reducing the risk of equipment damage.
• Compact molded case design optimizes panel space and simplifies installation and maintenance.
• OEM-compatible with matching Siemens OEM load centers and panelboards, ensuring a clean, reliable fit and straightforward replacement.
• Versatile installation profile suitable for residential, commercial, and light industrial applications where 480V service is standard.

Why this matters

In higher-voltage, three-phase systems, reliable protection is critical to protect wiring, transformers, motors, and downstream devices. The ED43B125L couples Siemens engineering with a proven molded case design to deliver predictable tripping behavior, minimizing downtime and maintenance costs in busy electrical spaces.

Applications and use cases

• New commercial installations that rely on 480V three-phase power distribution.
• Panelboard upgrades or replacements in warehouses, office complexes, and light industrial facilities.
• Service panels in multi-zone buildings where space efficiency and reliable protection are priorities.
• Replacement of aging breakers in OEM-spec panels to maintain warranty alignment and performance.

Specifications at a glance

• Manufacturer: Siemens
• Part Number: ED43B125L
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 125A
• Voltage Rating: 480V
• Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

For professionals seeking a proven, space-efficient, OEM-compatible protection solution for 480V three-phase systems, the Siemens ED43B125L provides precise protection, reliable operation, and seamless compatibility with Siemens panelboards and load centers.