MJA36350 - 350 Amp Circuit Breaker

MJA36350 - 350 Amp Circuit Breaker

When matching the MJA36350 to your existing electrical distribution equipment, the useful details go well beyond the 350 amp rating. This 3-pole circuit breaker carries a 600VAC rated operational voltage, uses an ET 1.0 basic electronic trip unit, and has an I-Line connection on the line side with mechanical lugs on the load side. For buyers replacing a breaker in compatible existing or legacy equipment, these specifications provide meaningful checkpoints to confirm form, fit, and function rather than relying on the catalog number alone.

Key Features and Benefits

• 350 Amp, 3-Pole Configuration: Clearly defined electrical configuration helps narrow the fit check when replacing equipment in an existing distribution system.
• 600VAC Rated Operational Voltage: Rated for operation up to 600VAC at 50/60Hz under UL 489.
• ET 1.0 Electronic Trip Unit: Uses the specified basic electronic ET 1.0 trip technology rather than a thermal-magnetic configuration.
• I-Line Configuration: The line side uses an I-Line connection, while the load side uses mechanical lugs. This connection arrangement is an important compatibility detail.
• 80% Continuous Current Rating: The MJA36350 carries the manufacturer's stated 80% continuous current rating.
• Push-to-Trip Function: An integral push-to-trip button lets you manually trip the breaker.
• Known Conductor Range: The specified load-side connection accommodates 3 x 3/0 AWG through 3 x 500 kcmil aluminum/copper conductors.

Technical Specifications

• Catalog Number: MJA36350
  
• Product Type: Circuit Breaker
  
• Rated Current: 350A
  
• Number of Poles: 3
  
• Rated Operational Voltage: 600VAC, 50/60Hz, UL 489
  
• Network Frequency: 50/60Hz
  
• Trip Unit: ET 1.0
  
• Trip Unit Technology: Basic Electronic
  
• Continuous Current Rating: 80%
  
• Phase Connection: ABC
  
• UL 489 AIR: 100kA @ 240VAC; 65kA @ 480VAC; 25kA @ 600VAC
  
• IEC 60947-2 Icu: 65kA @ 240VAC; 50kA @ 380/415VAC
  
• IEC 60947-2 Ics: 35kA @ 240VAC; 25kA @ 380/415VAC
  
• Rated Impulse Withstand Voltage (Uimp): 8kV
  
• Line-Side Connection: I-Line Connection
  
• Load-Side Connection: Lugs
  
• Circuit Breaker Application: HACR Rated
  
• Height: 12.86 in (326.64 mm)
  
• Width: 8.27 in (210.06 mm)
  
• Depth: 8.05 in (204.47 mm)
  
• Net Weight: 29 lb (13.2 kg)
  

Material Compliance and Certifications

The MJA36350 carries documented UL, CSA, and NOM product certifications and is CE-marked. Manufacturer specifications also list UL, CSA, NEMA, NOM-003-SCFI-2000, and IEC 60947-2 as applicable standards. The enclosure protection designation is IP40, with Pollution Degree 3 per IEC 60947-1. It is also identified as HACR rated.

Where It Works Best

The MJA36350 350 amp circuit breaker suits compatible electrical distribution equipment requiring a 3-pole, 600VAC, I-Line breaker with an ET 1.0 electronic trip unit and an 80% continuous current rating. For legacy replacement work, the I-Line's line-side connection, load-side lugs, physical dimensions, conductor range, trip characteristics, and interrupting ratings make it important to check the complete specification.