The Siemens SITAS 4AM6542-5AD40 is a 2,500 VA control transformer — the second-largest in the SITAS range and the highest-power model in the 4AM6xxx frame size. Its enormous 13,300 VA short-time (S6) capacity — over 5× the continuous rating — provides the inrush headroom needed for the largest industrial motor control centers, where dozens of contactors may energize simultaneously. The dual 2×115 V secondary delivers 10.9 A per winding in series (230 V) or 21.8 A in parallel (115 V), sufficient for powering an entire control system from a single transformer. The EI 192/110 core — the largest in the standard SITAS line — achieves a class-leading 96% efficiency, meaning less heat in the panel and lower lifetime operating cost. At 194 × 180 × 178 mm and approximately 31.5 kg, this is a chassis-mount component designed for the largest industrial enclosures.

Key Features

• 2,500 VA continuous, 13,300 VA S6 — over 5× short-time surge capacity
• 96% efficiency — best in class for minimal panel heating
• 400 V ±5% primary (380/400/420 V) for industrial mains matching
• Dual 2×115 V secondary — 10.9 A series, 21.8 A parallel
• EI 192/110 core — massive iron cross-section for uncompromised regulation
• 194 × 180 × 178 mm, ~31.5 kg, screw/chassis mounting
• UL/CSA recognized, CE, EAC certified

Technical Data

Applications

Large-scale industrial motor control centers: automotive assembly line MCCs, steel mill auxiliary panels, large pumping station control systems, and process plant motor control rooms. The 2,500 VA rating powers entire control systems — dozens of contactors, protection relays, PLC racks, HMI panels, and field instrument loops — from a single transformer. The 96% efficiency is critical in these applications where transformers run 24/7 and waste heat must be minimized in already thermally loaded enclosures.