Beckwith Electric M‑4272 Integrated Synchronizing Motor Bus Transfer

The Beckwith Electric M‑4272 is an integrated synchronizing and motor bus transfer system designed to provide reliable automatic transfer of motor loads between independent power sources. It combines high‑speed bus transfer functionality with precise synchronism checking to ensure that motor loads are transferred without interruption or excessive stress. The system is ideal for applications with critical motor loads in industrial plants, utilities, and data centers where power continuity is essential.

Control and Operation

The M‑4272 continuously monitors the voltage, frequency, and phase angle of both sources. It offers multiple transfer modes including fast transfer, in‑phase transfer, and residual voltage transfer. The system features programmable transfer logic with adjustable time delays and voltage/frequency limits. It includes a built‑in synchronism check relay to prevent transfer under unsafe conditions. The unit also provides automatic start/stop control for emergency generators when used in standby applications.

Key Features

Adjustable voltage, frequency, and phase angle limits for transfer. High‑speed transfer capability (typically less than 50 ms). Programmable transfer sequences with multiple breaker control outputs. LED indicators for status and alarm conditions. The unit is housed in a rugged metal enclosure suitable for panel mounting. It operates from a wide range of DC or AC control voltages.

Technical Specifications

Voltage input: 100‑480 VAC, 50/60 Hz, three‑phase. Accuracy: ±0.5% for voltage, ±0.5 degree for phase angle. Output contacts: 4 Form C, rated 5 A at 250 VAC. Power supply: 24‑250 VDC or 120‑240 VAC. Operating temperature: –25°C to +65°C. Enclosure: IP30, panel‑mount. Complies with IEEE C37.90 and IEC 60255.

Applications

The M‑4272 is used in industrial plants with critical motor loads, utility substations, and data centers requiring high‑reliability power transfer. It is also used in cogeneration and renewable energy systems for seamless source switching.

Installation and Commissioning

Mount the unit in a panel cutout. Connect voltage inputs from both sources and control outputs to breakers and generator controls. Commissioning involves programming transfer parameters and verifying operation with simulation tests.

Reliability and Quality

Beckwith Electric’s M‑4272 is built with industrial‑grade components and tested for environmental resilience. Its microprocessor‑based design ensures accurate and repeatable transfer operations.

Conclusion

The Beckwith Electric M‑4272 integrated synchronizing and motor bus transfer system provides reliable, high‑speed transfer of critical motor loads, enhancing power system availability and protecting motor equipment.