Schneider Electric MJA36300 | 300A 3-Pole PowerPacT M-Frame Circuit Breaker

Main Description:

The Schneider Electric MJA36300 is a heavy-duty PowerPacT M-Frame molded case circuit breaker engineered for high-performance electrical distribution. With a 300A current rating, 3-pole configuration, and 600VAC operating capability, this breaker delivers robust overload and short-circuit protection. Its ET 1.0 electronic trip unit provides accurate, reliable long-time and magnetic fault response, while the 25kA interrupting rating at 600VAC ensures dependable performance in industrial and commercial systems. Designed for I-Line mounting, the MJA36300 integrates quickly into panelboards and switchgear.

Technical Overview:

• Manufacturer: Schneider Electric

• Part Number: MJA36300

• Category: Circuit Breaker

• Subcategory: Molded Case Circuit Breaker

• Product Series: PowerPacT M-Frame

• Poles: 3

• Amperage Rating: 300A

• Voltage Rating: 600VAC (UL 489)

• Interrupting Rating:

  • 25kA @ 600VAC

  • 35kA @ 240VAC (IEC 60947-2)

• Breaking Capacity Code: J

• Trip Unit Technology: Electronic, ET 1.0

• Trip Unit Type: Fixed Long-Time with Magnetic Trip

• Magnetic Trip Range: 600–3000A

• Long-Time Pickup Range: 300–800A

• Continuous Current Rating: 80%

• Insulation Voltage: 750V (IEC)

• Impulse Withstand Voltage: 8kV

• Suitability for Isolation: Yes

• Utilization Category: Category A

• Control Type: Operating Handle

• Local Signaling: Trip Indicator (Green)

• Mounting Mode: I-Line Bracket

• Mounting Support: Bracket

• Terminal Identifier: AL800M23K

• Wire Size Range: 3 × AWG 3/0…3 × 500 kcmil (Cu/Al)

• Power Wire Strip Length: 0.98 in (25 mm)

• Mounting Height: 9 in

• Color: Black

• Dimensions (HxWxD): 12.86 in × 8.27 in × 8.05 in

• Net Weight: 29 lb (13.15 kg)

• Certifications: UL, CSA, NOM, IEC, CE

• Application Rating: HACR Rated

• Condition: New/Never Used Surplus

Key Features:

• High-capacity 300A protection for industrial and commercial systems

• ET 1.0 electronic trip unit for precise long-time and magnetic protection

• Rugged molded-case design with 25kA interrupting rating at 600VAC

• I-Line bracket mounting for quick installation and serviceability

• Integral push-to-trip button for manual operation

• Wide wire-range capability for flexible field installations

• Fully compliant with UL, CSA, NOM, IEC, and CE standards