Delixi CDM3 3P 400A Moulded Case Circuit Breaker

The Delixi CDM3-400L/3300 is a 3-pole 400A moulded case circuit breaker with a rated short-circuit breaking capacity of 70 kA at 400 V AC, manufactured to IEC 60947-2 and designed for use as the primary incoming protection device in main low-voltage switchboards, motor control centres, and high-current distribution panels in industrial and large commercial facilities. The CDM3 series represents Delixi's higher-frame MCCB line — positioned above the CDM1 in terms of frame current and interrupting performance — and targets the same application space as the Schneider Electric NSX400 and Compact NS400 products that are widely specified by electrical consultants across Saudi Arabia. For project electrical contractors and panel builders seeking a certified, IEC-compliant 400A MCCB at a competitive cost, the CDM3-400L/3300 is one of the most practical value alternatives available in the Saudi market.

At 400A, this MCCB typically serves as the main incomer to individual motor control centres, large power distribution panels, transformer secondary protection, or bus-section devices in main switchboards rated at 800A to 2000A. In Saudi Arabia's industrial and infrastructure project market — encompassing the petrochemical complexes of Jubail and Yanbu, the logistics and warehousing hubs of Dammam's King Abdulaziz Port, the manufacturing zones of Riyadh Industrial City, and the large hotel and convention facility developments that define Vision 2030's tourism expansion — the 400A MCCB is the fundamental building block of medium-scale LV power distribution. The CDM3-400L/3300's 70 kA breaking capacity gives it a fault-clearance rating appropriate for service directly off the secondary busbars of distribution transformers rated up to 2000 kVA at 11 kV, covering the majority of industrial site substations in the Kingdom.

The CDM3-400L/3300 features an electronic trip unit variant alongside the standard thermal-magnetic configuration, providing independent and precisely adjustable long-time overload (Ir), short-time delay (Isd), and instantaneous (Ii) pick-up settings. This three-zone adjustability is essential for achieving proper selectivity in multi-tier LV distribution systems where the 400A MCCB must coordinate with 100A–250A downstream MCCBs and with the upstream 1600A or 3200A air circuit breaker. Selectivity at 400A without de-rating requires the independent Isd zone that the CDM3 electronic trip unit provides — a feature not available on purely thermal-magnetic MCCBs — and is a requirement that Saudi petrochemical plant electrical engineers increasingly specify in LV switchgear procurement packages for ARAMCO and SABIC facilities.

Razz Middle East is the supplier partner for Delixi CDM3 MCCBs across the Gulf, with technical capability to support protection coordination studies, provide IEC 60947-2 test certificates, and supply the full CDM3 accessory range. Our engineering team can advise on setting the electronic trip unit's Ir, Isd, and Ii zones to achieve full selectivity with upstream and downstream protection devices in complex LV distribution schemes. We supply CDM3-400L/3300 units to panel fabricators in Riyadh, Jeddah, Dammam, Jubail, and Yanbu, with competitive project pricing in SAR available on request.