Siemens NEB2B040B - 40 A, 600 V, 2-Pole Bolt-On Circuit Breaker | AmpState

The Siemens NEB2B040B is a rugged 2-pole bolt-on molded case circuit breaker designed to protect branch circuits from overcurrent and short circuits in panelboards and load centers. With a 40 A rating and 600 V capacity, this device is built to meet the demands of residential, commercial, and light industrial electrical systems while offering dependable protection and long-term performance.

Why this breaker stands up in real-world service

• Secure bolt-on mounting delivers a rigid, vibration-resistant connection to the bus bar, reducing the risk of connection loosening in environments with mechanical noise or movement.
• Thermal-magnetic trip unit provides stable, repeatable protection by combining thermal overload sensing with magnetic short-circuit protection, delivering fast, predictable trips when faults occur.
• OEM-compatible design is purpose-built to work with matching Siemens OEM load centers and panelboards, making retrofits and replacements straightforward without compromising protection.
• Versatile applicability suited for residential panels, commercial distribution, and light industrial installations where reliable branch-circuit protection matters most.

The NEB2B040B is more than just a component—it's a reliable safeguard for wiring and equipment, helping prevent downstream damage, unplanned outages, and costly downtime. Its robust bolt-on configuration and precise thermal-magnetic protection are ideal for panel upgrades, service panel replacements, or new installations where a dependable, field-proven solution is required.

Technical snapshot

• Manufacturer: Siemens
• Part Number: NEB2B040B
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 40 A
• Voltage Rating: 600 V
• Number of Poles: 2
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Who benefits the most

• Electricians and contractors performing panel replacements or upgrades in homes, offices, and light manufacturing facilities
• Facilities managers overseeing distributed electrical systems that require dependable, low-maintenance protection
• Specifiers and engineers selecting compatible protection devices for Siemens panelboards and load centers

For a reliable, field-tested solution that combines secure installation with precise protection, the Siemens NEB2B040B 40 A, 600 V, 2-pole bolt-on circuit breaker is a clear choice. Choose it for durable performance, compatibility with Siemens panel systems, and protection you can count on in demanding environments.