Square D EJB26040 - 40 A, 600 V, 2-Pole Bolt-On Circuit Breaker | AmpState

Meet the Square D EJB26040 — a 40A, 600V, 2-pole bolt-on molded case circuit breaker engineered to deliver dependable branch circuit protection in panelboards and loadcenters. Built to stand up to the demands of real-world electrical installations, it combines secure mounting with precise protection, helping keep your electrical system safe and reliable.

Why this breaker stands out

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection that stays tight through routine operation and mounting in challenging environments. This design minimizes contact loosening and ensures consistent performance over time.
• Thermal-magnetic trip unit delivers stable, repeatable protection by combining thermal protection for sustained overloads with magnetic instantaneous trip for short circuits. Expect predictable, quick responses that protect conductors and devices alike.
• OEM compatibility is built in — designed to work seamlessly with matching Square D OEM loadcenters and panelboards, offering plug-and-play reliability and reducing compatibility concerns during installation or replacement.
• Powerful, targeted protection for branch circuits up to 40A at up to 600V, making it suitable for a range of residential, commercial, and light industrial applications.

Who it's for and practical uses

Ideal for electricians and facilities managers who need a dependable, easy-to-install solution for protecting individual branch circuits within panelboards and load centers. Use cases include:

• Replacing aging breakers in Square D panels to restore original protection characteristics.
• Adding or upgrading a branch circuit in residential or small commercial spaces where 40A capacity is required.
• Maintaining electrical safety in light industrial setups that demand robust, vibration-resistant mounting and reliable trip behavior.

Technical snapshot

• Manufacturer: Square D
• Part number: EJB26040
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 40A
• Voltage rating: 600V
• Number of poles: 2
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

With the Square D EJB26040, you get a purpose-built solution that prioritizes secure installation, precise protection, and compatibility with your existing Square D infrastructure. If you’re upgrading, repairing, or expanding a panelboard or loadcenter, this 2-pole, 40-amp breaker offers a reliable path to safer, more resilient electrical distribution.