WEG MPW-25-3-D016 Motor Protection Circuit Breaker

The WEG MPW-25-3-D016 motor protection circuit breaker covers the 1.2 A to 1.6 A current range within the MPW-25 frame, providing integrated thermal-magnetic overload and short-circuit protection for three-phase motors from 0.37 kW to 0.55 kW at 400 V AC. This device is widely used in Saudi industrial motor control centres for HVAC, pumping, and process auxiliary applications requiring compact, standards-compliant motor branch circuit protection that meets IEC 60947-4-1 and Saudi Aramco SAES-P-100 requirements.

Key Technical Features

The thermal-magnetic trip mechanism combines a bimetallic overload element with a magnetic short-circuit element in a single compact body, eliminating the separate overload relay that traditional motor starters require. The adjustable current setting dial allows site commissioning engineers to match the trip threshold precisely to the motor's nameplate full-load current, accounting for service factor and ambient temperature derating. The three-pole design ensures all live conductors are simultaneously interrupted on trip, protecting motor windings from the single-phasing condition that is a leading cause of motor failure in Saudi industrial environments.

Compliance and Certification

IEC 60947-4-1 type testing confirms the MPW-25-3-D016's performance under worst-case fault conditions including maximum prospective short-circuit current, maximum ambient temperature, and end-of-life trip characteristic tolerances. Saudi Aramco and SABIC procurement teams require IEC type test certificates for motor protection devices; Razz Middle East provides complete documentation with each delivery including certificate of conformity, IEC test report references, and MSDS where applicable.

Saudi Applications

The 1.2–1.6 A range covers motors used for instrument air compressor auxiliaries, valve actuator drives, laboratory ventilation fans, small irrigation pump starters at Saudi agricultural facilities, and convenience outlet circuit starters in industrial buildings. In desalination plants operated by SWCC and ACWA Power across the Saudi coast, arrays of small motor starters using MPW-25-3-D016 protect brine transfer pumps and chemical dosing pumps. Razz Middle East supports these end users with local inventory, application engineering, and commissioning assistance.