Siemens B240EG - 40 A, 240 V Circuit Breaker | AmpState

Siemens B240EG is a 40A, 240V molded case circuit breaker designed for dependable branch circuit protection in panelboards and loadcenters. With a compact molded case and a thermal-magnetic trip unit, it delivers precise, repeatable protection against overloads and short circuits, helping you keep electrical systems safe and available.

Why this breaker stands out

• Space-saving molded case design minimizes footprint in crowded panels, freeing room for future circuits.
• Thermal-magnetic trip provides fast fault response with stable trip characteristics, reducing nuisance trips and protecting wiring and devices.
• OEM-loadcenter compatible designed to work seamlessly with matching Siemens panelboards and loadcenters for straightforward replacement and dependable operation.
• Versatile across environments ideal for residential, commercial, and light industrial applications where reliable protection is essential.

Technical snapshot

• Manufacturer: Siemens
• Part Number: B240EG
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 40A
• Voltage Rating: 240V
• Application: Branch circuit overcurrent and short-circuit protection

Where and how you’ll use it

In a home subpanel or a commercial loadcenter, the B240EG protects feeders and branch circuits that draw up to 40 amperes. It’s well-suited for circuits feeding conveyors, HVAC coils, lighting banks, outlets, or small motors where a robust 40A limit is appropriate. Because it’s designed for 240-volt systems, you’ll find it compatible with standard residential and light commercial wiring practices.

Practical guidance for installation and longevity

• Match with compatible Siemens panelboards and loadcenters to ensure reliable mechanical fit and electrical performance.
• Follow local codes for conductor sizing and protection; typically, 40A circuits use appropriately sized conductors per NEC/IEC standards.
• Torque and termination adhere to manufacturer specifications to prevent loose connections and overheating.
• Availability and replacement strategy stocking B240EG simplifies replacements and upgrades in existing Siemens installations.

Choosing the Siemens B240EG means opting for a trusted, purpose-built solution that pairs with Siemens' own panel ecosystems. It’s more than a breaker—it’s a building-block for safer, more reliable electrical distribution in spaces where every ampere matters.