225A, 120/240V, single-phase open-transition ATS rated for service entrance installation. Electrically operated, mechanically held, break-before-make switching with dual mechanical and electrical interlocking. Service rated — can be installed at the service entrance without additional upstream overcurrent protection. NEMA 3R enclosure rated for indoor and outdoor installation. Breaker Rating Update — September 2025: Cummins issued revised Withstand Closing Breaker Ratings for the Spec C family. UL and CUL listing confirmed August 14, 2025. AHJ documentation available in PDFs below. Features & Benefits Service Entrance Rated Listed for installation at the service entrance. No separate main disconnect required upstream. Simplifies installation and reduces overall equipment cost on qualifying projects. PC40-11 Controller Microprocessor-based. Backlit LCD. Soft-touch keypad. Front panel or PC configuration. Ships with Modbus RTU and TCP. Configurable I/O. Programmable exercise scheduler included. Voltage Imbalance Sensing Monitors both sources continuously. Catches imbalance conditions beyond standard over/under voltage limits. Phase Rotation Monitoring Confirms correct phase sequence on both sources before every transfer. Blocks transfer to a miswired or out-of-sequence source. Contact Assembly Silver alloy main contacts under high closing pressure. Dedicated arcing contacts protect main contacts from switching wear. Multi-layer arc chutes extinguish arcs after each operation. UL 1008 certified — contacts included. NEMA 3R Enclosure Rated for rain, sleet, and external ice. Suitable for rooftops, outdoor generator pads, and exposed mechanical spaces. Field-Install Options Remote annunciator — Load shedding — Integral control power supply — Ethernet/Modbus TCP module — Anticondensation heater — Auxiliary contact expansion (8 or 16 configurable contact sets) Specifications Voltage 120/240V, Single-Phase, 60 Hz Amperage 225A Enclosure NEMA 3R Indoor/Outdoor Controller PowerCommand PC40-11 Transition Open Delayed; Open-In-Phase Transfer Time ≤6 cycles / 60 Hz Neutral Bar Full-rated with lugs Aux Contacts 2x isolated N/O, 10A/250V Surge Compliance IEEE C62.41 / C62.42 Arc Interruption Multi-layer arc chute assembly Manual Override Yes — all sources de-energized Service Rating Service Entrance Rated Certification UL 1008 Warranty One-year Cummins limited warranty. Covers unit, contact assemblies, and PC40-11 control.
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