EN 61 558-2-1, EN 61 558-2-2, EN 61 558-2-4 (at U SEC > 50 V AC), EN 61 558-2-6, VDE 0570. CE, UL. Control transformers, 1-phase, 4AM Series. Use as power, safety or displacement transformers in accordance with the applicable EN norm High short-term performance Low switch-on power (switch-on rush) Protect against short circuits and overloading with motor protection switches on main side Electrically isolated coils Screw terminal connectors