Powermax 400A MCCB
The Powermax MCCB 400A provides high-performance overcurrent and short-circuit protection for complex industrial electrical distribution systems. This three-pole molded case circuit breaker manages high-capacity power loads while preventing catastrophic damage to downstream equipment. It integrates a fixed thermal-magnetic trip unit to ensure a reliable response to sustained overloads and sudden electrical faults. The internal architecture features high-grade silver alloy contacts that minimize voltage drops across the terminals. The housing utilizes a glass-reinforced polyester resin casing for superior dielectric strength and thermal resistance. This protective device supports both top and bottom cable entry for flexible installation in main switchboards.
Key Features
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Advanced Arc Extinguishing System
Integrated arc chutes quickly dissipate ionized gases during high-current interruptions to prevent internal flashovers. -
Thermal-Magnetic Trip Mechanism
- Bimetallic strip provides precise protection against long-term thermal overloads
- Electromagnetic coil ensures instantaneous tripping during high-magnitude short circuits
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Robust Mechanical Interface
The heavy-duty toggle handle provides clear visual indication of ON, OFF, and TRIP status positions. -
Industrial Grade Terminals
- Lug-type connectors support large cross-section copper or aluminum conductors
- Silver-plated contact surfaces reduce electrical resistance and heat generation
Specifications
| Feature | Specification |
|---|---|
| Rated Current (In) | 400A |
| Number of Poles | 3-Pole |
| Breaking Capacity (Icu) | 36kA at 415V AC |
| Rated Operational Voltage (Ue) | 415V / 690V AC |
| Insulation Voltage (Ui) | 800V |
| Impulse Withstand Voltage (Uimp) | 8kV |
| Trip Unit Type | Fixed Thermal-Magnetic |
| Standard Compliance | IEC 60947-2 |
What’s in the Box
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1 x 400-Ampere Molded Case Circuit Breaker Unit
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3 x Inter-phase Barriers
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1 x Set of Terminal Mounting Bolts
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1 x Installation Manual
Why Choose Powermax 400A MCCB
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High fault current handling ensures the safety of critical power infrastructure during major electrical surges.
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Durable silver-tungsten contact materials resist erosion from repeated high-load switching operations.
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Standardized frame dimensions allow for straightforward integration into existing industrial panel boards.
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The unit maintains consistent calibration across an operational temperature range of -5 to 40 degrees Celsius.
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Manual test buttons enable technical teams to verify trip functionality without applying live electrical loads; consequently, maintenance downtime is reduced.
Maina Kamau (verified owner) –
Good build quality. We installed this for a client’s workshop in Industrial Area. The 36kA rating is exactly what we needed for the main switchboard protection. It’s solid and handles the load without heating up like some of the cheaper brands we’ve tried before.
Faith Mutua (verified owner) –
Powermax is becoming my go-to for these heavy breakers. Price is very fair compared to the big European brands but the performance is just as good. Delivery to Westlands was fast and the item was well-packaged.
Josphat Ochieng (verified owner) –
Heavy duty breaker. Terminals are well-made and easy to tighten properly. No issues so far with the installation.
Sarah Wanjiku (verified owner) –
Used this for a commercial office block upgrade. The 400A capacity is perfect for our main distribution board. It fits well in the standard panels. Only wish it came with a few more mounting accessories in the box, but otherwise a solid product for the price.
Eng. Bernard K. (verified owner) –
The breaker itself is high quality and very robust. I’m giving 3 stars because the packaging box arrived slightly crushed during transit, though the component inside was safe. For technical guys, just ensure the 36kA breaking capacity matches your site fault level, but for most Nairobi commercial buildings, this is more than enough.