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WATSNB-250/250-4CBR-X

The Schneider Electric WATSNB-250/250-4CBR-X is a 250A, 4-pole (3P+N), Closed Transition (Parallel) Automatic Transfer Switch (ATS). It is a high-performance, microprocessor-controlled unit designed for seamless and reliable power source transfer between two supplies (typically Main/Utility and Backup/Generator) in critical power applications. The "Closed Transition" (CBR) feature enables "make-before-break" switching, allowing uninterrupted transfer without power interruption to the load.

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Specifications Parameter Specification Product Line WATSNB Automatic Transfer Switch Rated Operational Current (Ie) 250 A (per pole, for both sources) Number of Poles 4 Poles (3P + N) Transition Type Closed Transition (Parallel) - Sources are briefly paralleled during transfer. Switching Elements Two electrically/mechanically interlocked Molded Case Circuit Breakers (MCCBs) or specially designed contactors. Rated Voltage (Ue) Typically 400/415V AC, 50/60 Hz (Up to 690V AC possible) Withstand & Making Capacity High short-time withstand current (Icw) and short-circuit making capacity (Icm) as per breaker specifications. Control Unit Advanced microprocessor-based controller (indicated by the final "X" character, e.g., "D"). Controller Functions • Voltage & Frequency monitoring of both sources • Programmable transfer delays (engine cool-down/start-up) • Closed transition sync-check & parallel time control • Load shedding/adding management • Communication capability (Modbus, etc.) Standards IEC 60947-6-1, UL 1008, CSA Operation Modes • Auto: Fully automatic operation based on source availability. • Manual: Local manual control. • Test/Off: For maintenance and testing. Mechanical/Electrical Interlocks Prevents simultaneous closure of both source breakers. Enclosure Typically supplied as a assembled panel or enclosed unit (IP rating varies).