Eaton Cutler-Hammer EHB3040 40A 3P Circuit Breaker | AmpState

The Eaton Cutler-Hammer EHB3040 is a reliable 40 A, 3-pole circuit breaker engineered for everyday electrical work in panelboards, load centers, and electrical distribution systems. This unit shines in retrofit projects and maintenance planning where keeping the part number consistent is crucial for quick swaps and minimal downtime.

What makes the EHB3040 unique

• Stable part number for retrofit and maintenance—EHB3040 keeps your install consistent across replacements, reducing the risk of compatibility issues during service windows.
• Solid 40-amp protection for multi-phase circuits—designed to reliably interrupt fault currents and protect equipment in three-phase distribution networks.
• 3-pole design—ideal for three-phase panelboards and load centers, providing coordinated protection across all phases.
• Panelboard and load center compatibility—built to integrate with standard Eaton distribution systems, simplifying stocking and onsite replacements.
• AmpState availability—trusted sourcing with clear part identification to support inventory and procurement workflows.

Ideal use cases

• Retrofit projects where the existing EHB3040 footprint and part number must be preserved for seamless maintenance planning.
• Electrical distribution upgrades in commercial, industrial, or multifamily applications that rely on dependable 3-phase protection.
• Routine panelboard maintenance and component swaps that require a proven, manufacturer-backed 40 A breaker.
• New installations that demand a trusted, standards-compliant breaker compatible with Eaton panelboards and load centers.

How it helps you manage your electrical protection

The EHB3040 provides precise circuit protection against overloads and faults, helping prevent damage to wiring and connected equipment. Its 3-pole configuration ensures synchronized disconnection across all phases, which is essential for balanced loads and safe shutdowns in three-phase systems. When planning maintenance or expansions, this breaker’s consistent part number simplifies ordering and compatibility checks, reducing downtime and guesswork.

Specifications at a glance

• Manufacturer: Eaton Cutler-Hammer
• Part Number: EHB3040
• Type: Circuit Breaker
• Amperage: 40 A
• Poles: 3
• Applications: Panelboards, load centers, electrical distribution
• Availability: Available from AmpState

If you need help matching a part number or confirming compatibility with your specific panelboard or load center, message us and we’ll help you confirm fit.