Next-Generation Protection for Modern Power Systems
The Eaton IZMX Series is a new generation of air circuit breakers (ACBs) designed to deliver outstanding performance in a remarkably compact footprint. Part of the NRX series, the IZMX family combines space-saving design, modular flexibility, and advanced protection – making it the ideal choice for today’s demanding power distribution applications.
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World-Class Compact Design
The IZMX16 is recognized as the world’s smallest air circuit breaker, with a volume of just 0.024 m³ and a front surface of only 0.092 m² – slightly larger than an A4 sheet of paper. This innovative design allows two withdrawable breakers to be installed side-by-side in a 600 mm wide section, significantly reducing switchboard footprint and improving cost-efficiency.
The IZMX40 extends the series up to 4000 A with a depth of less than 400 mm for the drawout version, eliminating the need for additional copper connections in the termination area.
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Key Features & Benefits
Two Compact Frame Sizes – IZMX16 covers 630–1600 A, IZMX40 covers 800–4000 A, simplifying selection and integration
High Performance Ratings – Interrupting capacities from 42 kA up to 105 kA, with three breaking capacity levels (B, N, H)
3-Pole and 4-Pole Configurations – Available in both fixed and withdrawable mounting versions
Modular "Plug & Work" Accessories – Field-installable without tools; most accessories are common across both frame sizes
Integrated Flexible Terminals – Universal horizontal/vertical connection adapters reduce installation complexity.
100% Rated Neutral – Four-pole devices feature fully rated neutral conductors
Mechanical Reclosing Lockout – Standard safety feature prevents automatic reclosure after overload trips
Remote Reset & Automatic Reset Options – Available for remote or automated system operation
Power Xpert Release (PXR) – Intelligent Protection
The IZMX Series is equipped with the next-generation PXR trip unit platform, offering scalable protection and monitoring:
PXR20 (V-Type) – Ammeter version with current metering and programmable overcurrent protection
PXR25 (U-Type) – Power meter version with full power metering, power quality analysis, and onboard Modbus communication
LCD Display – Multilingual graphical interface for local diagnostics and configuration
MicroUSB Port – Enables PC-based configuration and testing via PXR Configuration and Test Tool.
Waveform Capture & Diagnostics – Advanced event recording for fault analysis
Zone Selective Interlocking (ZSI) – Reduces fault clearing times while maintaining system selectivity.
Arcflash Reduction Maintenance System™ (ARMS) – Patented technology that significantly reduces arc flash energy during maintenance operations, improving personnel safety
Communication-Ready
The IZMX Series supports modern communication protocols for seamless integration into smart power management systems:
Onboard Modbus – Standard on PXR25, optional on PXR20
External Communication Modules – PCAM (PROFIBUS-DP), MCAM (Modbus), ECAM (Ethernet) – only one external module can be installed
24 V DC Supply – Required for communication and display functions without load current
Applications
The IZMX Series is engineered for four primary application areas, with trip unit configurations tailored to each:
System Protection – Main and feeder protection in low-voltage power distribution networks
Motor Protection – Protecting large motors in industrial processes
Transformer Protection – Safeguarding distribution and power transformers
Generator Protection – Ensuring reliable operation and fault isolation for backup and prime power generators
Additional applications include:
Coupler Switches – Network coupling between different power supplies, in combination with automatic transfer switching devices
Synchronization Tasks – Breakers with closing releases for generator paralleling and main-tie-main configurations
Industrial Facilities – Manufacturing plants, processing facilities, and heavy industry
Commercial Buildings – High-rise offices, data centers, hospitals, and airports
Energy & Utilities – Renewable energy plants, oil & gas facilities, and water treatment plants
With its compact dimensions, high performance, and intelligent protection features, the Eaton IZMX Series sets a new standard in air circuit breaker technology – delivering safety, reliability, and efficiency for critical power systems worldwide.
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