Square D EJB16040 40 Amp Molded Case Circuit Breaker 347 Volt 1 Pole

Square D EJB16040 is a reliable 40 Amp, 1-pole bolt-on molded case circuit breaker designed to protect your branch circuits with precision. Rated for up to 347V, it delivers dependable overcurrent and short-circuit protection in panelboards and load centers, making it a solid choice for a wide range of installations.

Key features

• Secure bolt-on mounting for a rigid, vibration-resistant bus connection that stays put in demanding environments.
• Thermal-magnetic trip unit provides stable, repeatable protection by combining a thermal overload element with a magnetic short-circuit trip for immediate response when needed.
• Molded-case construction built to withstand daily use and provide long-lasting durability in electrical panels.
• 1-pole, 40A configuration with a 347V rating, ideal for single-leg feeder circuits and lighting/receptacle runs in appropriate systems.
• OEM compatibility designed to pair with matching Square D OEM load centers and panelboards for straightforward replacement and reliable fit.
• Versatile applications suitable for residential, commercial, and light industrial environments where dependable short-circuit protection is essential.

Why it matters

When wiring loads from panelboards and load centers, a single fault can cascade into expensive downtime or equipment damage. The EJB16040 delivers a crisp, predictable response to overloads and faults, helping you:

• Prevent electrical fires and equipment damage by interrupting excessive current quickly.
• Maintain panel integrity with a mounting design that resists loosening from vibration and temperature changes.
• Enjoy compatibility confidence with panels that specify Square D OEM breakers, ensuring correct fit and trip characteristics.

Ideal use cases

• Replacing or upgrading a single-pole branch circuit in residential sub-panels or light commercial panels.
• Feeding lighting circuits, receptacle banks, or small appliances circuits in commercial spaces with a 347V distribution scheme.
• Upgrading panel protection in retrofit projects where a compact bolt-on solution is required.

Specifications at a glance

• : 40A
• Voltage rating: 347V
• Poles: 1
• Mounting style: Bolt-on
• Type: Thermal-magnetic molded case circuit breaker
• Part number: EJB16040

Choose the Square D EJB16040 for proven reliability, robust protection, and seamless integration into compatible panelboards and load centers. It’s the practical, solution-oriented choice for safeguarding electrical circuits in a variety of settings.