The Siemens 4AM6542-5MT10-0FA0 is a 2.5 kVA single-phase control transformer from the SITAS series, specifically wound for 690 V industrial mains — a distribution voltage widely used in heavy process industries, large pumping stations, and motor control centers across Europe and Asia. Its three-tap primary (725/690/655 V) accommodates site voltage variations while delivering a reliable 230 V secondary for control circuits.

Why 690 V?

690 V distribution allows higher power transmission with lower current than 400 V systems, reducing cable cross-sections and I²R losses in large facilities. Control panels fed from a 690 V bus need a transformer like the 5MT10 to derive the 230 V control supply without introducing a separate lower-voltage feeder. This variant fills that specific niche in the SITAS lineup.

Performance and Protection

Delivers 2.5 kVA continuous with a 13.3 kVA S6 short-time surge rating for contactor banks, solenoid actuators, and relay logic. Low switch-on inrush current prevents upstream breaker nuisance tripping. Efficiency reaches approximately 96% at full load, and the relative short-circuit voltage of 1.83% ensures adequate secondary stability. The IP00 open-frame design mounts inside a control cabinet via screw fixing.

Standards and Dimensions

Complies with EN 61558-2-1/-2-2/-2-4, UL/CSA recognized, CE and UKCA marked. Built on the EI 192/110 core platform shared with the entire 4AM6542 series. Dimensions: 180 × 194 × 178 mm (H×W×D). Net weight: approximately 31.2 kg.

Related Products in the SITAS Series

For standard 400 V mains, the 4AM6542-5AT10-0FA0 is the default choice. The 4AM6542-5FT10-0FA0 covers 500 V systems, and the multi-tap 4AM6542-8ED40-0FA0 (575/550/525 V) bridges the gap between 500 V and 690 V distributions. All deliver the same 2.5 kVA on the shared SITAS core platform.