Technical Parameters Parameter Description / Value Product Series ABB Moeller Series MT (Motor Protective Circuit Breakers) Device Type Motor Protective Circuit Breaker / Manual Motor Starter (MPCB) Frame Size MT25 Rated Operational Current (Ie) The "H1" suffix determines this. Typically, for an MT25H1, the adjustable overload current range is around 0.25 - 25 Amps (Example). Must be verified with the official chart. Utilization Category AC-3 (Squirrel cage motor starting, switching off during running) Poles 3 Poles for main power circuit (standard for three-phase motors). Rated Operational Voltage (Ue) Up to 690 V AC Rated Insulation Voltage (Ui) 690 V Short-Circuit Breaking Capacity (Icu/Ics) Typically very high for its size, e.g., 50 kA @ 400V AC (IEC 60947-2). Must be confirmed. Motor Power Range Corresponding to its current setting range, e.g., ~0.12 kW - 11 kW @ 400V 3ph. Trip Class Typically Class 10 (Trip time within 10 seconds at 7.2 x Ir). This is standard for general-purpose motor protection. Built-in Auxiliary Contacts "H1" indicates a specific configuration. Commonly 1 NO (Normally Open) + 1 NC (Normally Closed) auxiliary contact for signaling or control interlocking. Control Method Manual rotary handle (ON-OFF-RESET). Standards IEC/EN 60947-2, IEC/EN 60947-4-1 Ambient Temperature Typically -25°C to +60°C (compensated).