EF3B040 - 40 Amp Circuit Breaker
- 40 Amp
- 14k @ 600VAC; 14k @ 480VAC; 18k @ 240VAC
- 3 Pole
Purchase Options: Refurbished
EF3B040 - 40 Amp Circuit Breaker Description
EF3B040 - 40 Amp Circuit Breaker
If you’re working on an existing electrical system and need a circuit breaker that fits right the first time, the EF3B040 is built for exactly that purpose. Designed for EF3 frame applications, this 40-amp, 3-pole molded case circuit breaker makes it easier to replace a worn or faulty unit without second-guessing compatibility. It’s a straightforward solution for maintaining your system’s protection—helping guard against overloads and short circuits while keeping your equipment running as intended. Whether you’re servicing a commercial panel or handling routine maintenance in an industrial setup, this breaker is made to drop into place and do its job without unnecessary complications.
Key Features and Benefits
- Exact Fit for EF3 Frame Systems – Designed to align with existing panel configurations, reducing install time
- 40 Amp Capacity – Ideal for protecting moderate-load circuits in commercial and industrial settings
- 3-Pole Design – Supports three-phase power distribution
- Thermal-Magnetic Trip Mechanism – Helps respond to both sustained overloads and sudden faults
- Calibrated for 40°C Environments – Matches standard operating conditions found in most electrical rooms
- Built to Last – Solid construction designed for long-term use in working electrical systems
Technical Specifications
- Part Number: EF3B040
- Amperage: 40A
- Number of Poles: 3
- Frame Type: EF3
-
Interrupting Capacity (A.I.C.):
- 14kA @ 600VAC
- 14kA @ 480VAC
- 18kA @ 240VAC
- Temperature Rating: 40°C
- Breaker Type: Molded Case Circuit Breaker
- Dimensions (Approx.): 6.0" height
- Weight: 4.5 lbs
Material Compliance and Certifications
- Industry Standards: This circuit breaker is built in line with standard industry requirements for molded case breakers, including proper insulation and interrupting ratings.
- Installation Guidance: It is intended for use within its specified limits and should be installed in accordance with local electrical codes and regulations.
Where It Works Best
- Commercial buildings with existing EF3 panel setups
- Industrial facilities maintaining three-phase power systems
- Electrical distribution panels requiring a 40A, 3-pole breaker
- Maintenance and repair projects where matching the original breaker is critical
Use of Original Equipment Manufacturer (OEM) trademarks, names, and logos is for informational and identification purposes only. This does not imply any affiliation, sponsorship, endorsement, or approval by the original equipment manufacturer. CIRCUIT BREAKER SUPERSTORE® is an independent reseller and is not an authorized distributor, affiliate, or representative of any manufacturer. Manufacturer warranties do not apply unless expressly stated. All trademarks and registered trademarks are the property of their respective owners.
Specifications
- Width:4.5
- Height:6.0
- Depth:3.63
- Poles:3
- Amperes:40
- A.I.C. Rating & Volts:14k @ 600VAC; 14k @ 480VAC; 18k @ 240VAC
- Type:EF3
- Approx Dimensions:4.50"W x 6.00"L x 3.63"D
- Additional Notes:40°C, Molded Case Circuit Breaker
Returns are easy
You may return unused items within 30 days of delivery for a full refund.
FREE shipping on breaker orders over $100 and all other items with orders over $500.
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CIRCUIT BREAKER SUPERSTORE® provides a limited 1-year warranty on both new and reconditioned products. Rest assured, all products are authentic OEM (original equipment manufacturer).