Eaton IZMX40 Air Circuit Breaker

The Eaton IZMX40 Air Circuit Breaker is Eaton's highest-rated withdrawable four-pole ACB, covering current ratings from 2000 A to 4000 A with breaking capacities up to 150 kA at 415 V AC — making it the appropriate main incomer choice for Saudi Arabia's highest-fault-level LV switchgear installations including ARAMCO LNG facility main distribution centres, SABIC ethylene cracker utility substations, SEC high-power industrial consumer delivery points, and major HVAC chiller plant main panels in large commercial developments such as NEOM districts, Red Sea Project resorts, and Riyadh giga-project mixed-use towers. The IZMX40N4-A32F is rated for 4000 A continuous service and achieves its fault-clearing performance without requiring upstream current-limiting fuses, simplifying the switchgear design and improving system availability.

The IZMX40 is equipped with Eaton's advanced EN7 electronic trip unit, which extends beyond basic LSI protection to include full LSIG (long-time, short-time, instantaneous, and ground fault) functions with separate zone selective interlocking for each protection element. The EN7 incorporates onboard event logging for the last 500 events with date-time stamps, power quality measurement including THD on voltage and current, and a Modbus RTU communication port for integration into SCADA and power management systems. This transforms the main ACB from a passive protection device into an active energy management node — a configuration increasingly specified by ARAMCO's electrical engineering standard SAES-P-100 and SABIC's corporate electrical standards for new facility construction and major upgrades.

Physically, the IZMX40 employs a robust silver-alloy contact system designed for 10,000 mechanical operations and 15 close-open fault operations at rated short-circuit current. The drawout mechanism includes position indication in connected, test, and disconnected positions, with a mechanical interlocking system that prevents racking under load — a critical safety feature for high-energy main ACB applications. The front-access design allows complete maintenance inspection from the front of the switchgear without requiring rear access, which is essential for wall-mounted switchgear installations common in Saudi Arabia's industrial and commercial projects.

Razz Middle East maintains IZMX40 units in key current ratings and can source any configuration from Eaton's regional distribution centre within 2 to 4 weeks. We provide full type test documentation, switchgear coordination studies, and EN7 trip unit commissioning support. Our engineers have completed IZMX40 installations on major projects in Jubail, Ras Al Khair, Riyadh, and the Red Sea coast.