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Model A064G545 (RA112S3) | 100 Amp | 120/240V Single-Phase, 2-Pole | Service Entrance Rated | NEMA 3R Enclosure | UL 1008 Listed | Compatible with Cummins RS & RX Series Generators
The Cummins RA 100 Amp SE 240V 1-Phase Automatic Transfer Switch (ATS) is designed to provide seamless and automatic power transfer between the utility supply and backup generator system. This switch ensures critical loads remain powered during power outages, making it ideal for both residential and commercial applications. With its 100 Amp capacity and compatibility with Cummins backup generators, the ATS ensures reliable, uninterrupted power during emergencies.
This 2-pole, service entrance rated switch integrates directly with Cummins RS and RX Series (Connect Series) liquid-cooled generators, providing a simplified, quicker installation compared to standalone transfer switch setups. The RA112S3 continuously monitors utility power 24/7; when power becomes unsatisfactory or fails, it signals the generator to start and automatically transfers the load, then switches back to utility once stable power returns — with no homeowner action required.
100 Amp Capacity: Efficient load transfer for residential and light-commercial standby systems.
120/240V, 1-Phase System: Versatile electrical distribution for common home and commercial power configurations.
Automatic Transfer Functionality: Ensures uninterrupted power supply by automatically switching between utility and generator sources.
Easy Generator Integration: Designed for simplified installation with Cummins RS and RX Series backup generator systems.
Residential & Commercial Ready: Suitable for a wide range of standby power installations.
Durable, Long-Term Performance: UL 1008 listed construction built for reliable operation in demanding environments.
This ATS is ideal for residential and commercial applications requiring automatic standby power. It provides smooth, automatic switching between utility power and generator power to keep critical loads energized during outages. Its service entrance rating and NEMA 3R enclosure make it well suited for both indoor and sheltered outdoor mounting.
Installation: Field-installable by a certified Cummins technician or licensed electrician.
| MPN | A064G545 |
| Model | RA112S3 |
| Vendor | Cummins |
| Amperage | 100 Amps |
| Voltage | 120/240V |
| Phase Type | 1-Phase, 2-Pole |
| Transfer Type | Automatic |
| Enclosure | Service Entrance Rated, NEMA 3R |
| Weight | 51 lb |
| Dimensions (H × W × D) | 30.2 × 13.4 × 26 in |
| Operating Temperature | −13°F to 131°F (−25°C to 55°C) |
| Compatibility | Cummins RS & RX Series (Connect Series) Backup Generators |
Genuine Cummins OEM component covered under Cummins' standard limited warranty.
Meets UL 1008 certification for automatic transfer switches.
Complies with NEC and NFPA 70 requirements for standby power installations.
Approved for use with Cummins RS & RX Series generator models.
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