TEYL1050B - 50Amp Circuit Breaker

TEYL1050B - 50Amp Circuit Breaker

Finding the right replacement circuit breaker takes more than matching the amperage printed on the handle. When you're maintaining an electrical system, the mounting arrangement, voltage rating, interrupting capacity, and conductor connections all matter. The ABB TEYL1050B Circuit Breaker is a 50-amp, single-pole, bolt-on lighting panel circuit breaker from ABB's TEY / Q-Line family. Built around the TEYL frame, this compact breaker features a one-inch-per-pole design for compatibility with commercial and industrial electrical distribution equipment, including applications on grounded 480Y/277VAC systems.

Key Features and Benefits

• 50-Amp, Single-Pole Configuration:
• High Interrupting Capacity Ratings:
• Fixed Long-Time and Instantaneous Protection:
• Quick-Make / Quick-Break Mechanism:
• Compact Bolt-On Construction:
• Reverse-Feed Suitability:
• Form, Fit, and Function Replacement:

Technical Specifications

• Manufacturer: ABB
  
• Catalog Number: TEYL1050B
  
• Product Type: Lighting Panel Circuit Breaker
  
• Product Line: TEY / Q-Line (Bolt-On)
  
• Frame Type: TEYL
  
• Manufacturer Description: 50A, 1-Pole, 65 kA at 480/277VAC Circuit Breaker
  
• Amperage: 50 Amps
  
• Number of Poles: 1
  
• Mounting Style: Bolt-On
  
• Nominal Width Per Pole: 1 inch
  
• System Voltages Listed by Manufacturer: 120VAC, 120/240VAC, 125VDC, 240VAC, 277VAC, and 480/277VAC
  
• Interrupting Capacity at 120VAC: 100 kAIC
  
• Interrupting capacity at 120/240VAC: 100 kAIC
  
• Interrupting Capacity at 125VDC: 15 kAIC
  
• Interrupting Capacity at 277VAC: 65 kAIC
  
• Trip Function: LI (Long-Time and Instantaneous)
  
• Long-Time Trip Setting: Fixed
  
• Instantaneous Trip Setting: Fixed
  
• Operating Mechanism: Quick-Make / Quick-Break
  
• Trip Indication: Visible Trip Indication
  
• Common Trip Bar: Yes
  
• Continuous Current Rating Classification: Standard
  
• Suitable for Reverse Feed: Yes
  
• Wire Range (Copper/Aluminum): #10–#4 AWG
  
• Current Metering: No
  
• Protective Relays: No
  
• GSA Compliance: No
  
• UL File Number: E11592
  
• GO Schedule: EY
  
• Environmental Product Declaration: No Declaration Needed
  
• UPC: 783164462333
  

Material Compliance and Certifications

The ABB TEYL1050B 50 Amp Circuit Breaker is associated with UL File E11592, providing a manufacturer-supplied reference for verifying applicable UL certification information.

Where It Works Best

• Legacy Electrical Panel Maintenance:
• Commercial Lighting Panelboards:
• Industrial Electrical Distribution:
• Existing TEY / Q-Line Breaker Replacement: