Siemens NEB2B050B - 50 A, 600 V, 2-Pole Bolt-On Circuit Breaker | AmpState

Siemens NEB2B050B is a 50A, 600V, 2-pole bolt-on molded case circuit breaker designed to deliver dependable branch circuit protection in panelboards and loadcenters. Its secure bolt-on mounting creates a rigid, vibration-resistant bus connection, helping maintain reliable performance in real-world installations.

• Secure bolt-on mounting provides a robust, vibration-resistant connection to the panel’s bus
• Thermal-magnetic trip unit delivers stable, repeatable protection for both overload and short-circuit conditions
• Compatible with matching OEM load centers and panelboards for a streamlined replacement or expansion
• Suitable for residential, commercial, and light industrial electrical applications

Specifications at a glance

• Manufacturer: Siemens
• Part Number: NEB2B050B
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 50A
• Voltage Rating: 600V
• Number of Poles: 2
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Real-world use cases

• Residential subpanels where a durable, permanently mounted breaker is required for long-term reliability
• Commercial panelboards needing a vibration-resistant solution that won’t loosen with daily operation
• Light industrial panels that demand 600V protection with a compact, two-pole design

Installation and compatibility

The NEB2B050B is designed to work with Siemens OEM load centers and panelboards that support bolt-on, molded case breakers. Its thermal-magnetic trip mechanism provides a dependable baseline of protection across typical operating temperatures, helping you maintain safe, predictable electrical performance without surprises.

Why choose this Siemens breaker

Choosing the Siemens NEB2B050B means aligning your protection strategy with a proven component engineered for secure mounting and durable signaling of faults. The 2-pole, 50A, 600V rating covers a wide range of branch circuits, while the bolt-on design minimizes the risk of loose connections in environments subject to vibration or movement. For installers and facility managers seeking a direct fit for Siemens systems, this breaker offers a precise, compatible solution that supports reliable, long-term protection of electrical infrastructure.