Cummins Onan 100 AMP Service Entrance Rated Automatic Transfer Switch A064G545

Cummins Onan 100 AMP Service Entrance Rated Automatic Transfer Switch A064G545

Please Note: This item is NOT RETURNABLE.

SKU: CMGA064G545

The Cummins Onan 100 Amp Service Entrance Rated Automatic Transfer Switch A064G545 RA112S3 is designed to provide seamless and reliable power transfer between utility and generator sources.

This advanced transfer switch ensures that your home or business remains powered during outages by automatically monitoring utility power and switching to generator supply when needed. It is engineered with break‑before‑make functionality, preventing simultaneous connection of utility and generator power.

The mechanical and electrical interlocks add an extra layer of safety, ensuring secure operation at all times. Built with long‑life silver‑alloy contacts, the switch resists burning and pitting, offering durability and consistent performance.

Its mechanically held contacts provide quiet operation, reducing noise during transitions. The aluminum enclosure is NEMA Type 3R rated, making it suitable for both indoor and outdoor installations.

This transfer switch is UL 1008 listed, meeting the highest standards for safety and compliance. It integrates seamlessly with Cummins RS series gensets, simplifying installation and reducing setup time.

Designed for residential and light commercial applications, it adheres to NEC and NFPA requirements, ensuring compliance with national electrical standards.

With a Cummins 2‑year limited warranty, this product offers peace of mind and long‑term reliability.

Key Benefits & Advanced Features

• Automatic Power Transfer ensures uninterrupted electricity supply.

• 100 Amp Service Rated suitable for whole house applications.

• Dual Pole Switch supports 120/240V single phase generators.

• Break‑Before‑Make Functionality isolates generator from utility power.

• Mechanical Interlock prevents simultaneous closing of contacts.

• Electrical Interlock ensures safe power source switching.

• Long‑Life Silver‑Alloy Contacts resist burning and pitting.

• Quiet Operation with mechanically held contacts.

• NEMA Type 3R Enclosure suitable for indoor and outdoor use.

• UL 1008 Listed meets transfer switch safety standards.

• Integrated with RS Series Gensets for simplified installation.

• Continuous Monitoring of utility power 24/7.

• Automatic Generator Start when utility power fails.

• Automatic Reconnection when utility power stabilizes.

• Cummins 2‑Year Limited Warranty ensures product reliability.

Detailed Technical Specifications

• Model: A064G545 RA112S3

• Type: Automatic Transfer Switch (ATS)

• Service Rating: 100 Amp

• Voltage: 120/240V Single Phase

• Poles: 2

• Function: Break‑Before‑Make isolation

• Mechanical Interlock: Included

• Electrical Interlock: Included

• Contacts: High‑pressure silver‑alloy

• Operation: Mechanically held for quiet performance

• Enclosure: Aluminum, NEMA Type 3R rated

• Installation: Indoor/Outdoor

• Certification: UL 1008 Listed

• Compliance: NEC and NFPA standards

• Integration: RS series genset compatible

• Warranty: 2 years limited coverage

• Monitoring: 24/7 utility power monitoring

• Application: Residential and light commercial standby systems

Ideal Applications

This transfer switch is ideal for whole house standby power systems, residential backup installations, and light commercial facilities requiring reliable automatic power transfer.

Real‑World Performance & User Experiences

Users benefit from seamless transitions between utility and generator power, with quiet operation and dependable performance. The automatic monitoring ensures peace of mind, as the system responds instantly to outages without requiring manual intervention.

Comparison with Similar Generators

Compared to non‑service rated switches, the RA112S3 offers enhanced safety and compliance. Its UL 1008 listing and NEC/NFPA adherence make it superior to generic transfer switches, ensuring long‑term reliability.

Step‑by‑Step Setup Guide

1. Position the transfer switch near the generator and utility connection.

2. Mount securely using appropriate hardware.

3. Connect utility power lines to designated terminals.

4. Connect generator power lines to emergency terminals.

5. Ensure mechanical and electrical interlocks are properly aligned.

6. Verify wiring connections according to installation manual.

7. Test system functionality by simulating utility power loss.

8. Confirm automatic transfer and reconnection operations.

Maintenance Schedule & Tips

• Inspect wiring connections every 6 months.

• Clean enclosure exterior regularly.

• Test automatic transfer function annually.

• Ensure enclosure remains dry and ventilated.

• Replace worn contacts if necessary.

• Follow Cummins service guidelines for long‑term reliability.

Long‑Term Cost of Ownership Analysis

The RA112S3 reduces long‑term costs by minimizing downtime and preventing damage from improper power transfer. Its durable construction and compliance with safety standards ensure reliable operation, lowering maintenance expenses.

Warranty

Includes a Cummins 2‑year limited warranty covering defects in materials and workmanship. Warranty support provides confidence and assurance of product reliability.

Frequently Asked Questions

Q: Is this transfer switch suitable for whole house applications? A: Yes, it is service entrance rated for 100 Amp systems.

Q: Can it be installed outdoors? A: Yes, the NEMA Type 3R aluminum enclosure is rated for indoor and outdoor use.

Q: Does it meet safety standards? A: Yes, it is UL 1008 listed and complies with NEC and NFPA requirements.

Q: Is this item returnable? A: No, this item is not returnable.

Final Verdict

The Cummins Onan 100 Amp Service Entrance Rated Automatic Transfer Switch A064G545 RA112S3 is a reliable, safe, and efficient solution for residential and light commercial standby power systems.

Its advanced features, compliance with safety standards, and Cummins warranty make it an essential component for dependable backup power.