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The Eaton Cutler-Hammer Magnum MWI85N is a high-capacity low voltage air circuit breaker (ACB) designed for industrial power distribution, switchgear systems, generators, heavy-duty motor protection, and critical electrical infrastructure. This 3-pole 5000A breaker belongs to the Magnum IEC low-voltage power circuit breaker family and is widely used in utility, marine, oil & gas, mining, and large industrial facilities.
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| Item | Specification |
|---|---|
| Brand | Eaton / Cutler-Hammer |
| Series | Magnum IEC |
| Model | MWI85N |
| Product Type | Low Voltage Air Circuit Breaker (ACB) |
| Rated Current | 5000A |
| Number of Poles | 3 Pole |
| Voltage Rating | Up to 690 VAC |
| Interrupting Capacity | 85kA at 690VAC |
| Mounting Type | Fixed or Drawout |
| Frame Type | Double-Wide Frame |
| Frequency | 50/60 Hz |
| Protection Functions | LSIG / Digitrip RMS |
| Breaker Technology | Air Circuit Breaker |
| Application | Switchgear, Power Distribution, Generator Protection |
| Standards | IEC 60947-2 |
| Operating Mechanism | Stored Energy Spring Mechanism |
| Protection Rating | Industrial LV Power Protection |
The Magnum MWI series supports advanced electronic trip units and high interrupting performance for demanding industrial environments.
High-capacity 5000A industrial air circuit breaker
85kA interrupting capacity at 690VAC
Suitable for low-voltage main distribution systems
Available in fixed and withdrawable versions
Compatible with Digitrip RMS electronic trip units
Reliable protection for transformers, generators, and bus systems
Rugged construction for harsh industrial environments
Supports remote operation and motorized accessories
Designed for switchgear and critical infrastructure applications
The Eaton Cutler-Hammer Magnum MWI85N 5000A 3 Pole Low Voltage Air Circuit Breaker is engineered for high-performance electrical protection in industrial and commercial power systems. As part of the Magnum IEC breaker family, the MWI85N delivers exceptional interrupting capability, operational reliability, and advanced protection functions for critical electrical infrastructure.
This breaker is commonly installed in low-voltage switchgear assemblies, power generation facilities, marine electrical systems, petrochemical plants, mining operations, and heavy industrial distribution networks. With a rated current of 5000 amps and interrupting capacity up to 85kA, the breaker provides dependable protection against overloads, short circuits, and fault conditions.
The Magnum series is recognized for compact dimensions, high withstand ratings, and maintainability. The breaker can be configured with electronic trip units, communication modules, motor operators, shunt trips, undervoltage releases, and remote monitoring accessories to support modern intelligent power management systems.
Low-voltage switchgear
Main power distribution systems
Generator protection
Transformer protection
Marine electrical systems
Oil & gas facilities
Mining industry
Heavy industrial plants
Utility substations
Data centers and critical infrastructure
