NGB1B050B - 50 Amp Circuit Breaker

NGB1B050B - 50 Amp Circuit Breaker

Finding the right breaker for an existing panelboard often comes down to the details. The NGB1B050B is a 50-amp, 1-pole Type NGB molded-case circuit breaker for panelboard-mounted applications. It is rated 25kA at 277VAC and 100kA at 120VAC, carries an HACR rating, and includes load-side terminals.

The NGB1B050B measures approximately 5.0 inches high, 1.0 inch wide, and 3.06 inches deep. Those dimensions matter, especially when you're working with an existing or legacy electrical system where the replacement needs to match the original configuration. Rather than changing what is already there, this breaker is intended for applications that call for the same NGB type, pole count, amperage, mounting style, and electrical ratings.

For electricians, maintenance crews, and facility teams, that makes identification a little easier. Check the existing breaker and panelboard requirements against the specifications below. If the NGB1B050B part number, 50A rating, single-pole design, dimensions, voltage, and A.I.C. ratings match the application requirements, you have a much clearer path to determining fit. When correctly selected, installed, and used within their specified ratings, these breakers are built to last.

Key Features and Benefits

• 50A, single-pole design for applications requiring this specific breaker configuration.
• Type NGB molded case circuit breaker designed to match compatible NGB equipment.
• Panelboard mount configuration for use in the appropriate existing panelboard setup.
• Rated 25kA at 277VAC and 100kA at 120VAC.
• HACR rated for applications requiring this designation.
• Load-side terminals are included with the breaker configuration.
• Compact 5.0" H × 1.0" W × 3.06" D dimensions help when checking physical fit.
• Well suited to replacement and maintenance work where maintaining the original form, fit, and function is important.

Technical Specifications

• Part Number: NGB1B050B
  
• Type: NGB
  
• Breaker Type: Molded Case Circuit Breaker
  
• Mounting: Panelboard Mount
  
• Poles: 1
  
• Amperage: 50A
  
• A.I.C. Rating & Voltage: 25kA @ 277VAC; 100kA @ 120VAC
  
• Height: 5.0 in.
  
• Width: 1.0 in.
  
• Depth: 3.06 in.
  
• Temperature Rating: 40.25°C
  
• HACR Rated: Yes
  
• Load-Side Terminals: Included
  

Material Compliance and Certifications

• The available specifications identify the NGB1B050B as HACR rated. The supplied product information provides no additional material-compliance declarations or certifications, so do not assume them.
• If a particular installation requires a specific listing, certification, or material standard, check the applicable product documentation and project requirements before installation.

Where It Works Best

• The NGB1B050B makes the most sense in an existing electrical system that was designed to accept a Type NGB 50 amp, 1-pole molded case circuit breaker with the same mounting arrangement and electrical characteristics. It's especially relevant for maintenance and replacement jobs involving compatible legacy panelboards.
• And this is one of those situations where the small details count. Don't rely on appearance alone. Check the part number, breaker type, amperage, number of poles, voltage, A.I.C. rating, mounting method, dimensions, and terminal requirements against the equipment you're servicing.
• When those specifications match, the NGB1B050B provides the form, fit, and function required for the intended application—without making unnecessary claims about performance or capabilities beyond its stated ratings.