E3040 40 Amp Circuit Breaker

E3040 40 Amp Circuit Breaker

The E3040 circuit breaker is a 3-pole, 40-amp thermal-magnetic circuit breaker designed for dependable protection of electrical distribution systems operating at up to 240VAC. Built for compatibility with systems using the E-frame platform, this breaker helps protect conductors and connected equipment by interrupting overloads and short circuits through a non-interchangeable thermal-magnetic trip unit. Its 40°C rating supports use in typical commercial and industrial electrical environments, while the included load terminals simplify installation and secure conductor connections. Designed with the durability expected from traditional molded case breakers, the E3040 provides a form, fit, and functional replacement for existing equipment where the same ratings and frame configuration are required. For maintenance teams, contractors, and facility managers maintaining legacy power distribution systems, this breaker offers a straightforward solution that aligns with original electrical specifications.

Key Features and Benefits

• 3-Pole Configuration – Designed for three-phase electrical systems requiring coordinated protection across all phases.
• 40 Amp Rating – Suitable for branch circuit protection where a 40A breaker is specified.
• Thermal-Magnetic Trip Mechanism – Combines thermal overload protection with magnetic response to short circuits.
• Non-Interchangeable Trip Unit – Factory-set trip characteristics maintain consistent protection settings.
• 10kA Interrupting Rating at 240VAC – Supports safe interruption of fault currents within its rating.
• 40°C Ambient Rating – Designed for operation in typical electrical equipment environments.
• Includes Load Terminals – Helps streamline installation and conductor termination.
• Built to Last – Traditional molded case breaker construction designed for long-term service in compatible systems.

Technical Specifications

• Part Number: E3040
• Poles: 3
• Amperage Rating: 40 Amps
• Voltage Rating: 240VAC
• Interrupting Capacity (A.I.C.): 10kA @ 240VAC
• Frame Type: E
• Trip Type: Thermal-Magnetic, Non-Interchangeable Trip Unit
• Ambient Temperature Rating: 40°C
• Included Components: Load Terminals
• Approximate Shipping Weight: 4.13 lbs
• Shipping Dimensions (Height): 6.0 in

Material Compliance and Certifications

• Industry Standards: The E3040 molded case circuit breaker is manufactured to meet applicable electrical equipment standards for circuit protection and system safety.
• UL and CSA Standards: Molded case breakers of this type are typically produced in accordance with UL and CSA electrical safety requirements and are intended for installation in properly rated panelboards and distribution equipment.
• Always verify compatibility with the specific electrical system and applicable code requirements before installation.

Where It Works Best

• The E3040 3-pole 40A circuit breaker is commonly used in electrical distribution equipment that requires an E-frame molded case breaker with a 40-amp rating. Typical applications include:
• Commercial and industrial panelboards and distribution panels
• Three-phase branch circuits requiring 40-amp overcurrent protection
• Motor and equipment circuits within the breaker’s voltage and interrupting ratings
• Maintenance and replacement projects where the original breaker specifications must be matched
• Electrical systems operating in facilities, manufacturing areas, and service equipment