Square D EJB14040 Bolt-On Molded Case Circuit Breaker – 1 Pole – 40A – 277VAC – Thermal Magnetic

The Square D EJB14040 is a high-interrupting capacity molded case circuit breaker engineered for commercial, industrial, and OEM power distribution applications. Manufactured by Schneider Electric, this 1-pole, 40A breaker provides dependable thermal-magnetic protection against overloads and short-circuit faults while maintaining compatibility with Square D NF panelboards.

As part of the EJB Series E-Frame family, the EJB14040 utilizes a secure bolt-on mounting configuration and features a thermal-magnetic trip unit with long-time and instantaneous protection functions. Its high fault-current interruption capability makes it suitable for demanding electrical systems where elevated available fault currents are present.

The breaker incorporates a visual trip indicator for quick fault identification and is calibrated for operation in 40°C ambient conditions. Designed specifically for NF panelboard installations, it is both HID-rated and HACR-rated, making it suitable for lighting, HVAC, and general electrical distribution applications.

Specifications

• Brand: Square D
• Manufacturer: Schneider Electric
• Part Number: EJB14040
• Series: EJB Series
• Type: Molded Case Circuit Breaker
• Frame Type: E-Frame
• Configuration: 1 Pole
• Phase: 1 Phase
• Current Rating: 40A
• Voltage Rating: 277VAC
• Connection Type: Bolt-On
• Mounting Style: Bolt-On
• Protection Type: Thermal Magnetic
• Trip Function: LI – Long-Time and Instantaneous
• Product Destination: Square D NF Panelboards

Interrupting Ratings

• 65kA @ 277VAC
• 65kA @ 240VAC
• 100kA @ 120VAC

Dimensions

• Height: 5.66 in
• Width: 0.98 in
• Depth: 4.05 in
• Weight: 2 lbs

Construction Features

• E-Frame molded case circuit breaker design
• Thermal-magnetic trip unit for overload and short-circuit protection
• Long-time and instantaneous trip functions
• Bolt-on mounting configuration
• Visual trip indicator for rapid fault identification
• Aluminum lug terminals included
• Calibrated for 40°C operation
• Designed for NF panelboard installations
• HID-rated and HACR-rated construction

Electrical Characteristics

• Line Rated Current: 40A
• Maximum Operating Voltage: 277VAC
• Holding Current: 270A
• Trip Unit Rating: 875A
• Protection Type: Short-Circuit / Overload

Wire Range

• Aluminum Conductors: AWG 12–6
• Copper Conductors: AWG 14–6

Applications

• Commercial electrical distribution systems
• Industrial power distribution equipment
• HVAC equipment protection
• HID lighting circuits
• Branch circuit protection
• NF panelboard installations

Standards & Approvals

• UL Listed
• CSA Approved
• HID Rated
• HACR Rated
• Authentic Square D / Schneider Electric product
• Manufactured to EJB Series specifications for NF panelboard application

Returns are easy

You may return items within 30 days of delivery for a refund.

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My Circuit Breakers provides a comprehensive 1-year warranty on both new and reconditioned products. Rest assured, all products are authentic OEM (original equipment manufacturer). Extended warranties are available upon request.