Siemens ED42B125 - 125 A, 480 V, 2-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens ED42B125, a dependable 2-pole bolt-on molded case circuit breaker engineered to safeguard branch circuits in panelboards and load centers. Rated at 125A and 480V, this device is designed to deliver precise overcurrent and short-circuit protection where reliability matters most—from residential service panels to light commercial and industrial applications.

Why this 2-pole bolt-on breaker stands out

• Secure bolt-on mounting ensures a rigid, vibration-resistant bus connection, reducing movement that can affect protection performance over time.
• Thermal-magnetic trip unit provides stable, repeatable protection across a broad range of loads and fault conditions, helping you avoid nuisance trips while still delivering fast fault clearing.
• OEM-compatible design is built to align with matching Siemens panelboards and other OEM load centers, simplifying replacement and service workflows.
• Versatile application suitable for residential, commercial, and light industrial environments where robust branch circuit protection is essential.

Technical specifications at a glance

• Manufacturer: Siemens
• Part Number: ED42B125
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 125A
• Voltage Rating: 480V
• Number of Poles: 2
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases and scenarios

• Upgrading or expanding residential service panels where a reliable 125A, 480V protection solution is required.
• Retrofitting commercial or light industrial load centers that demand a rugged bolt-on mount and stable trip characteristics.
• Replacing aging or worn breakers in existing Siemens panelboards to maintain consistent protection performance.
• Feeding critical branch circuits where vibration or environmental conditions could impact bus integrity without a secure connection.

Installation, compatibility, and practical tips

• Choose the ED42B125 when your panelboard specifies a bolt-on molded case breaker to ensure proper fit and reliable engagement with the bus bar.
• Confirm the panelboard’s OEM compatibility to streamline replacement and reduce downtime during service events.
• Follow standard electrical safety practices during installation, paying particular attention to torque requirements for bolt-on mounting to preserve the integrity of the bus connection.
• Use this 125A, 2-pole device as a main or feeder protection option in appropriate Siemens-panelboard configurations to protect conductors and downstream equipment from overcurrent conditions.

With the Siemens ED42B125, you’re choosing a purpose-built solution that blends rigorous protection with straightforward installation. It’s more than a breaker—it’s part of a reliable protection strategy for your electrical distribution, designed to keep circuits safe and systems up and running.