Q1B390 - 90 Amp Circuit Breaker

Q1B390 - 90 Amp Circuit Breaker

Discover a dependable replacement breaker that fits into your existing system without fuss. The Q1B390 90A Bolt-on Thermal Magnetic Circuit Breaker offers precise protection against overloads and short circuits, and is built to slide right into most preconfigured panels. Whether you're servicing or upgrading industrial or commercial installations, this is the kind of component you want in your back pocket—straightforward, reliable, and engineered for long service life.

Key Features & Benefits

• Thermal + Magnetic Trip Mechanism: Offers dual-level defense: the thermal element handles prolonged overloads, while the magnetic trip handles fast, sudden surges or short circuits.
• Bolt-on Mounting System: Secures the breaker firmly, minimizing vibration and connection looseness, translating to fewer maintenance headaches.
• Space-Conscious Design: Consumes just six panel spaces, making it an excellent choice for retrofit or tight layouts.
• High Interrupting Capacity: Rated for 10,000 AIC (240 VAC), this breaker can safely interrupt high fault currents without damage.
• Three-Pole Configuration: Ideal for balanced three-phase systems common in commercial and industrial settings.

These features aren’t just “nice to have”—they translate into real-world advantages: fewer callbacks, protection under stress, and simplicity during installation or replacement.

Technical Specifications

• Amperage: 90 A
  
• Poles: 3
  
• Voltage Rating: 240 VAC
  
• A.I.C. Rating: 10,000 AIC @ 240 VAC
  
• Dimensions (W × L × D): 2.25 in × 6.38 in × 2.31 in
  
• Panel Space Usage: 6 spaces
  
• Frame Type: Q1B
  

Material Compliance & Certifications

• This breaker is designed and manufactured in compliance with industry safety and performance standards. It is UL Listed, confirming it has passed rigorous independent testing for safe operation under specified electrical stresses and conditions. Use it with confidence in installations that must meet code or safety inspections.

Where It Works Best

• The Q1B390 excels as a drop-in replacement in established commercial or industrial electrical panels. It’s especially useful in:
• Manufacturing plants or workshops upgrading or maintaining three-phase equipment
• Retrofitting or servicing existing switchgear where space and compatibility matter
• Critical power circuits in lighting, HVAC, or motors that must stay protected
• Environments where high fault currents demand a breaker with strong interrupting capability