Siemens ED43B125 - 125 A, 480 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Siemens ED43B125 is a purpose-built, 125A, 480V three-pole bolt-on molded case circuit breaker designed to protect distribution systems with precision. Engineered for reliability in panelboards and load centers, this unit delivers dependable branch circuit overcurrent and short-circuit protection in a compact, rugged package.

Why this ED43B125 stands out

• Secure bolt-on mounting creates a rigid, vibration-resistant bus connection that stays tight in busy electrical environments.
• Thermal-magnetic trip unit provides stable, repeatable protection—overload and short-circuit protection respond consistently even with changing loads.
• 3-pole design ideal for 3-phase systems, delivering coordinated protection across all phases.
• OEM-compatible designed to work with matching Siemens load centers and panelboards for seamless integration and listing compatibility.
• Versatile installation suitable for residential, commercial, and light industrial applications, making it a flexible choice for various distribution needs.

Specifications at a glance

• Manufacturer: Siemens
• Part Number: ED43B125
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 125A
• Voltage Rating: 480V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases

Replace or upgrade breakers in commercial panelboards and light industrial load centers where reliable 480V distribution protection is required. The bolt-on design is especially advantageous in installations where vibration resistance and a solid electrical connection matter most, such as crowded equipment rooms or retrofit projects where panel integrity is critical.

Installation and compatibility tips

Pair this ED43B125 with matching Siemens panelboards to maintain listing and ensure optimal performance. Verify compatibility with your current electrical infrastructure and observe proper torque and mounting procedures to preserve full protection characteristics. This unit is purpose-built to integrate smoothly into Siemens-based systems, delivering consistent trip performance and easy maintenance over time.

With AmpState, you’re getting a Siemens ED43B125 that combines robust construction, precise protection, and installer-friendly features for dependable 3-phase distribution protection in modern electrical environments.