Siemens ED42B020 - 20 A, 480 V, 2-Pole Bolt-On Circuit Breaker | AmpState

Engineered for dependable protection in commercial and industrial electrical systems, the Siemens ED42B020 is a 20A, 480V, 2-pole bolt-on molded case circuit breaker designed to guard branch circuits against overcurrent and short circuits. Built to endure the demands of busy electrical environments, it combines precise protection with robust, vibration-resistant mounting that stays secure even in equipment with movement or vibration.

Key advantages

• Bolt-on mounting for a rigid bus connection—ensures a solid, vibration-resistant interface that maintains consistent performance over time.
• Thermal-magnetic trip unit—delivers stable, repeatable protection by blending thermal overload sensing with magnetic instantaneous trip for short-circuit events.
• OEM-ready compatibility—designed to work with matching Siemens OEM load centers and panelboards, simplifying replacement and upgrades.
• Versatile application footprint—suitable for residential, commercial, and light industrial panel configurations that require reliable 480V protection.

Technical specifications at a glance

• Manufacturer: Siemens
• Part Number: ED42B020
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 20A
• Voltage Rating: 480V
• Number of Poles: 2
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

What makes this breaker uniquely valuable

The ED42B020 isn’t just about meeting specifications—it’s about delivering reliable protection where it matters. The thermal-magnetic trip mechanism provides predictable response across a range of fault conditions, so you know exactly when and why the circuit will trip. The bolt-on design isn’t merely a mounting choice; it’s a practical solution for environments where vibration, panel movement, or high-energy equipment demands a more secure, maintenance-friendly connection. When paired with compatible Siemens panelboards, this breaker helps maintain consistent electrical performance and simplifies future service or upgrades.

Ideal use cases and scenarios

• Upgrading or stocking spare breakers in commercial electrical rooms and industrial panels that operate at 480V.
• Protecting branch circuits feeding motors, HVAC equipment, lighting, and other 480V loads in light industrial settings.
• Replacement in OEM-managed load centers where exact compatibility and mounting geometry are essential for safe, code-compliant operation.
• Applications requiring rapid, reliable short-circuit protection with predictable trip behavior in environments with vibration or equipment movement.

Installation and compatibility notes

Designed to integrate with matching Siemens OEM load centers and panelboards, the ED42B020 provides a seamless retrofit path and streamlined maintenance. The bolt-on mounting system creates a robust electrical connection that resists loosening over time, helping to minimize nuisance tripping and connection faults in demanding installations. When selecting replacement components, ensure your panelboard or loadcenter supports a 2-pole, 480V, 20A molded case breaker to maintain electrical safety and compliance.

Why choose Siemens ED42B020 for your panels

Professionals choose the ED42B020 for its combination of precise protection, durable construction, and OEM compatibility. If you’re upgrading a panelboard in a commercial or light industrial setting, this breaker offers dependable overcurrent and short-circuit protection, with a mounting solution that stands up to vibration and time. With Siemens’ reputation for reliability in molded case breakers, you get predictable performance, easier serviceability, and a clear path for future panel updates.