Socomec ATyS 3D 400A 4-Pole Automatic Transfer Switch

The Socomec ATyS 3D 400A 4-Pole Automatic Transfer Switch (model 3120 4400) represents Socomec's heavy-duty, motor-operated transfer switch platform for main LV switchboard-level changeover in large commercial, industrial, and critical infrastructure facilities across Saudi Arabia. Unlike the 6D series with its compact panel-mount form factor, the ATyS 3D at 400A is a freestanding or switchboard-integrated motor-operated switch assembly capable of delivering the full switching performance required at the main incomer of an LV main distribution board (MDB) serving a hospital complex, data centre, industrial plant, or large commercial facility. The ATyS 3D series uses Socomec's proven overlapping contact break-before-make mechanism to achieve transfer times well within the 10-cycle (200 ms at 50 Hz) requirement specified by NFPA 110 for Level 1 emergency systems — ensuring that critical loads such as life support equipment, emergency lighting, and fire suppression control panels remain energised during the changeover sequence.

The 400A ATyS 3D is the most widely deployed heavy-duty ATS product in Saudi Arabia's hospital sector. King Fahad Medical City's distribution system, the numerous Ministry of Health regional hospitals built under Vision 2030 healthcare expansion programmes, and private hospital chains including the Saudi German Hospital Group and Mouwasat Medical Services specify ATyS 3D units at their main LV board level. The product's SEC grid code compliance, ARAMCO project approval track record, and IEC 60947-6-1 certification together mean that it passes the document verification stage of Saudi project procurement without the lengthy re-evaluation process that some international products require. For data centre projects — an increasingly important sector as Saudi Arabia accelerates its digital infrastructure build-out under Vision 2030 — the ATyS 3D's transfer performance is fully compatible with UPS input bridge time specifications from all major UPS manufacturers, meaning the UPS can bridge the changeover gap without going to battery backup if the transfer switch acts within its rated window.

SABIC and ARAMCO downstream processing facilities in Jubail and Yanbu require generator backup at multiple points in their electrical distribution hierarchy. The ATyS 3D 400A is used at LV switchboard incomers serving critical process loads including DCS control rooms, compressor motor control centres, and safety instrumented system (SIS) power supplies, where any supply interruption carries significant process safety implications. In these applications, the ATyS 3D's built-in Modbus RTU communication port allows integration with plant SCADA systems for remote status monitoring and alarm generation without additional protocol converters.

Razz Middle East stocks ATyS 3D 400A units and provides full project support services: specification compliance review against ARAMCO GIs and SEC standards, generator compatibility analysis, panel integration drawings, site commissioning, and post-commissioning maintenance training. Contact our Dammam or Riyadh branches for lead time and SAR pricing.