Siemens ED42B040L - 40 A, 480 V, 2-Pole Circuit Breaker | AmpState

Siemens ED42B040L is a compact, dependable molded case circuit breaker engineered to protect your electrical distribution without taking up valuable panel space. With a 40 A rating and 480 V operational capability, this 2-pole unit is perfectly suited for guarding branch circuits in panelboards and load centers across residential, commercial, and light industrial environments.

Why this Siemens ED42B040L stands out

• Efficient panel use: Its compact molded case design minimizes footprint while maintaining full protection performance, helping you fit more DC/AC circuits neatly inside the panelboard.
• Thermal-magnetic protection: The integrated trip unit provides stable, repeatable response to overloads and short circuits, reducing nuisance trips and safeguarding connected equipment under varying temperatures and loads.
• Two-pole, common-trip reliability: With two poles on a single frame, both hot legs trip together, increasing safety and ensuring consistent disconnect across the circuit.
• OEM compatibility: Designed to pair with matching Siemens OEM load centers and panelboards for seamless replacement and installation, minimizing compatibility concerns.
• Versatile application range: Ideal for residential panelboards, commercial electrical rooms, and light industrial distribution where dependable branch-circuit protection is essential.

Technical snapshot

• Manufacturer: Siemens
• Part Number: ED42B040L
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 40 A
• Voltage Rating: 480 V
• Number of Poles: 2
• Application: Branch circuit overcurrent and short-circuit protection in panelboards and load centers

Practical use cases

In a residential setting, the ED42B040L can protect a dedicated subpanel feeding essential loads such as heating, cooling, or water heaters, ensuring quick disconnection in fault conditions. In commercial spaces, it guards lighting and receptacle circuits or critical equipment in small mechanical rooms, while in light industrial environments it can protect feeders to compact machinery or control panels operating at 480 V. Its two-pole design and common-trip action are especially valuable where safety and coordinated shut-off are priorities.

Installation tips and considerations

• Verify panel compatibility with Siemens OEM load centers to ensure a trouble-free retrofit or replacement.
• Match the 40 A rating to the circuit wiring and protected equipment, confirming conductor sizing and overcurrent protection coordination.
• Use in applications that require a reliable 480 V feed; confirm that downstream devices and bus configurations support 480 V operation.
• Inspect the trip unit periodically as part of routine maintenance to confirm stable operation across temperature changes and load variations.

Whether you’re refreshing an aging panel or equipping a new installation, the Siemens ED42B040L delivers precise, dependable protection in a compact package. From residential subpanels to light commercial distribution, this 40 A, 480 V, 2-pole MCCB offers clear safety benefits, streamlined compatibility, and long-term peace of mind for your electrical system.