Eaton EHD1040 - 40 A, 277 V, 1-Pole Bolt-On Circuit Breaker | AmpState

Elevate electrical reliability with the Eaton EHD1040 — a 40A, 277V, 1-pole bolt-on molded case circuit breaker designed for dependable branch-circuit protection in panelboards and loadcenters.

Built for rugged environments, this breaker uses secure bolt-on mounting to deliver a rigid, vibration-resistant bus connection that stays seated under heavy loads and through routine maintenance. Its thermal-magnetic trip unit provides stable, repeatable protection: the thermal element guards against nuisance overloads, while the magnetic element responds quickly to short-circuit conditions, helping minimize damage to wiring and equipment.

Designed for seamless integration, the EHD1040 is compatible with matching OEM loadcenters and panelboards, making it a practical choice for both replacements and new installations. With a 277V rating, it’s well-suited for commercial lighting circuits, electrical distribution in office buildings, and light industrial applications where reliable 277V protection is required.

Key benefits and ideal use cases

• Secure bolt-on mounting— provides a rigid, vibration-resistant connection that maintains electrical integrity in demanding environments.
• Thermal-magnetic protection— stable nuisance-free operation with fast response to short circuits, reducing downtime and damage.
• 277V operation— expands applicability beyond residential panels to commercial and light industrial installations.
• OEM compatibility— straightforward replacement in existing installations with matched panelboards and loadcenters.
• 1-pole, 40A configuration— precise protection for individual branch circuits, ideal for dedicated circuits in lighting, outlets, and small equipment loads.

Technical specifications at a glance

• Manufacturer: Eaton
• Part Number: EHD1040
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 40A
• Voltage Rating: 277V
• Number of Poles: 1
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Whether you’re upgrading a panel, replacing a failed breaker, or configuring a new 277V distribution setup, the Eaton EHD1040 delivers reliable protection, ease of installation, and compatibility you can trust in residential, commercial, and light industrial environments.