WEG MPW-25-3-D010 Motor Protection Circuit Breaker

The WEG MPW-25-3-D010 motor protection circuit breaker covers the 0.8 A to 1.0 A current range within the MPW-25 frame, providing integrated thermal-magnetic overload and short-circuit protection for small three-phase induction motors installed in Saudi industrial motor control centres. This device eliminates the need for a separate bimetallic overload relay in compact starter assemblies, reducing panel space, wiring connections, and maintenance points — benefits that are particularly valued by MCC builders and EPC contractors working to Saudi Aramco and SABIC project schedules and space constraints.

Protection Features

Thermal trip protection responds proportionally to the square of the current, matching the I²t heating characteristic of motor windings. The adjustable current dial allows field calibration to motor nameplate FLC, and the manual reset mechanism ensures that a tripped device requires deliberate operator action before restart, preventing unintended auto-restart after overload — a safety feature aligned with IEC 60364-4-41 and Saudi Aramco safe restart guidelines. The magnetic trip provides instantaneous protection against short circuits at the breaker terminals, protecting the MCC busbars and inter-panel wiring.

Dimensional and Electrical Data

The MPW-25-3-D010 has a breaking capacity of 50 kA at 400 V AC and is rated for 690 V AC operation, suitable for both 380 V and 415 V systems used in Saudi industrial plants. The compact body width allows dense packing of multiple motor starters within a single MCC section. DIN-rail mounting follows EN 60715 standard, compatible with all major panel-builder DIN-rail systems used in the Kingdom.

Saudi Aramco MCC Design Practice

In Saudi Aramco MCCs, motor protection circuit breakers are specified as the motor branch circuit protection device per NEC Article 430 and IEC 60364-4-43 equivalent. The MPW-25-3-D010, when combined with CWM-series contactors and a WEG SSW soft starter or direct DOL configuration, forms a motor starter unit that can be factory-tested, type-tested, and submitted for Saudi Aramco IK review prior to site delivery. Razz Middle East assists project teams with preparing IK (Inspection and Kickoff) documentation packages for WEG MCC assemblies.

Applications

Common applications of the MPW-25-3-D010 in Saudi Arabia include instrument air dryer motors, cooling tower fan starters, fire pump jockey pump motors, sump pump starters in industrial buildings, and light-duty conveyor belt drives in warehousing and logistics facilities. The 0.8–1.0 A range matches three-phase motors in the 0.18–0.25 kW range at 400 V, a size widely used for auxiliary and services motors throughout Saudi industrial facilities.