MP390 - 90 Amp Circuit Breaker

MP390 - 90 Amp Circuit Breaker

The MP390 delivers dependable, high‑quality protection for residential electrical systems that require safe and stable power distribution. This 3‑pole, 240 VAC circuit breaker belongs to the respected MP‑T series—engineered for reliability and long-term service life. Whether you’re wiring a new meter stack or upgrading an existing panel, the MP390 keeps your circuits safe from overloads and short circuits while smoothly handling multi-phase loads.

Key Features and Benefits

• Thermal‑Magnetic Protection: The breaker’s advanced thermal-magnetic mechanism reacts precisely to both overloads and short circuits, giving you dependable protection without unnecessary interruptions.
• 3‑Pole Configuration: Its 3-phase design makes it ideal for complex residential wiring — especially in homes with 100 Amp, 3‑phase output meter stacks.
• 240 VAC Voltage Rating: Compatible with a wide range of low-voltage residential power systems for versatile installation.
• Compact, Easy-to-Install Form Factor: The small footprint simplifies installation and maintenance in tight electrical panels or meter stack enclosures.
• HACR Rated for HVAC and Refrigeration Use: Built to meet safety standards for heating, air‑conditioning, and refrigeration circuits — a plus if your system includes heavy-duty HVAC loads.
• 10 kA Interrupt Rating: Designed to safely interrupt high fault currents when necessary, providing added safety for demanding residential applications.
• Temperature Stability: Optimized to perform reliably even up to 40 °C operational conditions, maintaining consistent protection under heavy load or warm-environment scenarios.

Technical Specifications

• Series: MP‑T
• Poles: 3‑Pole
• Voltage Rating: 240 VAC
• Amperage Rating: 90 Amp
• Interrupt Rating: 10 kA
• Standards: HACR Rated
• Intended Use: 100 Amp, 3‑phase output WML meter stacks
• Dimensions: 2.756 × 2.756 × 2.756 inches
• Weight: 0.970 lb (approximately 0.44 kg)
• Operating Temperature: Up to 40 °C

Material Compliance and Certifications

• Industry Standards: The MP390 meets recognized industry standards for safe residential circuit protection. Its HACR rating confirms suitability for heating, ventilation, air conditioning, and refrigeration applications — ensuring the breaker can handle large, variable loads typical of HVAC systems. Built with quality materials and precision manufacturing, the MP390 delivers a consistent level of safety and performance homeowners and contractors can trust.

Where It Works Best

• The MP390 shines in residential settings that demand reliable 3-phase power distribution — particularly in homes or small apartment buildings using 100 Amp, 3-phase meter stacks. It’s an excellent choice for households that run heavy-duty appliances, HVAC systems, or multiple circuits with varying loads. If you’re looking for a circuit breaker that balances safety, durability, and ease of installation, the MP390 offers a dependable solution to keep your electrical system running smoothly and securely.