Siemens NGB3B050B - 50 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens NGB3B050B — a 50A, 600V, 3-pole bolt-on molded case circuit breaker built to shield panelboards and load centers from overcurrent and short-circuit events. Designed for dependable protection in a variety of settings, this breaker delivers secure performance when it matters most.

Why this breaker stands out

• Secure bolt-on mounting delivers a rigid, vibration-resistant bus connection that stays tight even in busy electrical rooms.
• Thermal-magnetic trip unit provides stable, repeatable protection by combining overload sensing with instantaneous short-circuit trip, reducing nuisance trips across temperature variations.
• 3-pole design supports 3-phase circuits common in commercial and light industrial systems.
• Siemens compatibility is engineered to pair with matching OEM load centers and panelboards for seamless replacement or upgrade.

Ideal applications

Use this breaker for branch circuit protection in residential service panels with 3‑phase capability, small commercial distribution panels, and light industrial panelboards. Its bolt‑on architecture and robust trip mechanism make it well-suited for environments where reliability and solid connections are essential.

Technical snapshot

• Manufacturer: Siemens
• Part number: NGB3B050B
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 50A
• Voltage rating: 600V
• Number of poles: 3
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Installation & compatibility tips

For reliable performance, pair this 50A, 3-pole breaker with Siemens NGB series panelboards and load centers. The bolt-on mounting simplifies installation and ensures a durable bus connection, making it a solid option for panel upgrades in residential spaces, small commercial settings, and light industrial installations. Ensure your panel is rated for 600V maximum and that circuit loading complies with local electrical codes.