Siemens NGB3B050B Circuit Breaker – VL Series – NGB Frame – 50A – 3 Pole – 600VAC – Bolt-On – Thermal Magnetic

The Siemens NGB3B050B is a VL Series molded case circuit breaker designed for reliable protection in three-phase panelboard and low-voltage distribution systems. Rated at 50A and 600VAC, this 3-pole breaker is built on the NGB frame platform and is suitable for compact industrial and commercial applications requiring dependable circuit protection.

Equipped with a thermal-magnetic trip unit, the NGB3B050B provides Long-Time and Instantaneous (LI) protection, ensuring fast and reliable response to overload and short-circuit conditions. Its bolt-on design allows secure installation in panelboards and supports reverse feed applications where applicable.

This breaker is UL listed and engineered for durability, consistent performance, and high interrupting capacity in demanding electrical environments.

Specifications

• Brand: Siemens / ITE
• Part Number: NGB3B050B
• Series: VL Series
• Frame Type: NGB Frame
• Category: Molded Case Circuit Breaker
• Mounting Type: Panelboard Bolt-On
• Configuration: 3 Pole
• Phase: 3 Phase
• Protection Type: Thermal Magnetic
• Trip Functions: LI – Long-Time and Instantaneous

Electrical Ratings

• Current Rating: 50A
• Voltage Rating: 600VAC
• Interrupting Capacity: 25kA @ 480VAC
• Application Suitability: Reverse feed capable (panelboard dependent)

Construction

• Compact NGB frame molded case design
• Bolt-on mounting system for panelboards
• Thermal-magnetic trip mechanism
• Load side lugs included
• Industrial-grade durable housing

Functions

• Overload protection
• Short-circuit protection
• Long-time delay protection
• Instantaneous fault protection
• Circuit switching and isolation

Dimensions

• Height: 3 in
• Width: 5.54 in
• Depth: 2.8 in
• Weight: 2.65 lb

Applications

• Commercial electrical panelboards
• Industrial distribution systems
• Three-phase branch circuit protection
• Lighting and control circuits
• Reverse feed panelboard systems

Returns are easy

You may return items within 30 days of delivery for a refund.

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