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Cummins RA400NSE 400A 1Ø-120/240V Nema 3R Automatic Transfer Switch

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The RA Automatic Transfer Switch is integrated with the RS series genset. These products are Listed to UL 1008, the Standard for Transfer Switch Safety. The switch and generator set combination is specifically designed for a simplified, quicker installation.

These UL 1008 switches are suitable for standby power systems in residential and light commercial applications. These RA products adhere to National Electrical Code (NEC) and National Fire Protection Association (NFPA) requirements.

The RA transfer switch monitors utility power 24 hours a day and 7 days a week. When utility power becomes unsatisfactory or fails; the generator set is signaled to start, then automatically transfers the load. When stable utility voltage returns, the transfer switch will automatically switch electrical load from the generator to the utility. No action is required by the home owner.

The RA switch is also available in Service Entrance models. A service entrance version is also UL 1008 listed and makes use of a UL 489 listed circuit breaker.


  • A powerful and economical solenoid drives the mechanism and a long-life, high pressure, silver alloy contact resists burning and pitting
  • Solid bus bar connection between circuit breaker and transfer switch
  • Fully rated neutral and ground bar are silver plated with bonding jumper
  • Solderless screw type terminals for external power connections for ease of connection


RA400NSE Spec Sheet RA400NSE Specifications Sheet
RA400NSE Outline Drawing RA400NSE Outline Drawing
RA400NSE Wiring Diagram RA400NSE Wiring Diagram
RA400NSE Interconnect Wiring Diagram RA400NSE Interconnect Wiring Diagram

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