Siemens ED42B040 - 40 A, 480 V, 2-Pole Bolt-On Circuit Breaker | AmpState

The Siemens ED42B040 is a 40-amp, 480-volt, 2-pole bolt-on molded case circuit breaker designed to protect branch circuits in panelboards and load centers. Built for dependable overcurrent and short-circuit protection, this unit delivers reliable performance in demanding electrical environments, from homes to light industrial facilities.

• Secure bolt-on mounting: Provides a rigid, vibration-resistant bus connection that stays firmly seated, reducing thermal stress and ensuring consistent protection even in environments with movement or vibrations.
• Thermal-magnetic trip unit: Combines precise thermal protection for overloads with fast magnetic response to short circuits, delivering stable, repeatable protection curves and minimizing nuisance trips.
• 2-pole, 480V design: Ideal for protecting 2-pole circuits in commercial and industrial distribution, supporting higher voltage applications while maintaining compact, panel-friendly form factor.
• OEM-compatible and panel-ready: Engineered to be compatible with matching Siemens OEM load centers and panelboards, simplifying installation and ensuring proper fit, labeling, and coordination.
• Rugged molded case construction: Designed for long service life in environments that demand reliability, with robust insulation and a compact footprint suitable for dense panel layouts.

Use cases span a wide range of installations: wiring 480V branch circuits for lighting, HVAC, and small motor loads in commercial spaces; providing dependable protection in light industrial panels; and replacing aging breakers in existing Siemens-compatible panelboards where a bolt-on solution is preferred for security and serviceability.

Why choose the ED42B040 over other breaker styles: The bolt-on design delivers a more secure connection in vibration-prone or high-energy environments, reducing the chance of loose bus connections. The thermal-magnetic trip unit offers a clear, predictable protection profile—tripping only when necessary and restoring quickly after faults. This combination is especially valuable in panelboards and load centers where reliable, continuous protection is critical for safety and uptime.

Technical snapshot:

• Manufacturer: Siemens
• Part Number: ED42B040
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 40A
• Voltage Rating: 480V
• Number of Poles: 2
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection