Siemens E41B040 40A 1P 277V Circuit Breaker | AmpState

Meet Siemens E41B040 — a purpose-built circuit breaker crafted to protect your electrical distribution when reliability matters most. With a 40 A rating, 1-pole design, and a 277V operating voltage, this unit delivers targeted overcurrent protection for critical circuits in panelboards and load centers.

Designed for precise protection in commercial and industrial settings

The Siemens E41B040 is purpose-made for panelboards, load centers, and electrical distribution networks where dependable single-pole protection at 277V is essential. It’s an excellent choice for retrofit work and maintenance planning, especially when keeping the original part number is important for records, warranties, and compatibility with existing gear.

Key features that matter in practice

• 40 A, 1-Pole, 277V — tailored for branch circuits powering lighting, receptacles, and small equipment on 277V systems.
• Single-pole design — simplifies replacement in existing single-circuit feeders, reducing downtime during service or upgrades.
• Part number stability — E41B040 ensures consistent replacements in maintenance inventories and retrofit projects without redefining documentation.
• Availability from AmpState — sourced to support timely procurement for ongoing projects and part replacements.

Ideal use cases

• Retrofits in commercial buildings where a proven 277V, 40 A single-pole breaker matches existing configuration.
• Maintenance planning for distributed electrical systems that require strict part-number continuity for records and compliance.
• Protecting individual 277V circuits in panelboards and load centers serving lighting, HVAC controls, or small equipment racks.

Why choose this Siemens breaker over alternatives

Choosing the Siemens E41B040 means adopting a solution that aligns with established infrastructure and documentation. Its 1P 277V specification is ideal for dedicated circuits in environments where voltage and current parameters are fixed, allowing for predictable trip behavior and straightforward replacement without reconfiguring the panel layout.

Practical sourcing and compatibility tips

If you’re verifying compatibility for a retrofit or maintenance plan, consider matching the exact part number (E41B040) to maintain consistency across your spares and service records. AmpState lists this unit as available, helping you secure it without project delays. For installations in existing systems, confirm that the panelboard or load center supports a 277V, 1-pole protection device of this rating to ensure proper coordination with upstream protection and downstream circuits.

Specifications at a glance

• Manufacturer: Siemens
• Part number: E41B040
• Product type: Circuit Breaker
• Amperage: 40 A
• Poles: 1 Pole
• Voltage: 277V