Cummins Power Generation A075F138 Details and Specifications
Cummins ATS OTEC SPEC C
277/480-Volt 3-Phase 4-Pole 225-Amp PowerCommand 40-11 Control NEMA 3R Indoor/Outdoor
Not Service Rated
Notice: In a communication issued on September 12, 2025, Cummins listed new specific Withstand Closing Breaker Ratings (WCR) for the OTEC Spec C family of transfer switches, effective immediately. The new breakers listed in the announcement received full UL and CUL approval as of August 14, 2025. Please see the attached Notification and Letter to the AHJ for UL and CUL approvals in the Product Information PDFs on this page.
The Cummins ATS SPEC C is the latest advancement of the OTEC automatic transfer switch products. It is an electrically operated, mechanically held open transition switch with mechanical and electrical interlocking suitable. For emergency, legally required, or optional standby circuits in commercial and light industrial applications. New features include:
- Upgraded PowerCommand Controller PC40-11
- Voltage Imbalance Sensing
- Phase Rotation
Includes the required features for primary source and generator set monitoring, starting, and load transfer to emergency standby applications.
The PC40-11 is a microprocessor-based control with LCD Display and tactile soft switches for ease of operation and navigation.
Comprehensive Cummins 1-Year Limited Warranty.
| PowerCommand Control PC40-11 Highlighted Features | |
|---|---|
| Standard Features | Optional Features Available |
| Clear Back-lit LCD with Status, Icons, Warnings | Standby Load Shed |
| PC or Front Panel Configuration | Modbus RTU and TCP Network Communication |
| Configurable I/O—Flexible for Many Applications | Configurable Output Contact Modules |
| Optional MODBUS RS485 Communication | Fully Network Compatible with Annunciator |
| Programmable Exerciser | |
| Test Modes | |
| See the PowerCommand 40-11 Control Specifications for full description, benefits, and features. | |
OTEC ATS Optional Field Installed Kits—Please Call for Quote
- PowerCommand Transfer Switch Remote Annunciator
- Load Shed From Standby Source
- Integral Control Power Supply
- Ethernet (Modbus TCP) Communication Module
- Anticondensation Heater for Outdoor Rated Enclosures
- Auxiliary Output Contact Expansion Module
- One module – 8 configurable contact sets
- Two modules – 16 configurable contact sets
This 480V 3-Phase 225A Cummins ATS OTEC Transfer Switch provides the basic hardware and features required for automatic operation of a standby generator.
Cummins OTEC Transfer Switch Advanced Mechanism
The ATS mechanism operates electrically with a mechanical hold in the Source 1 and Source 2 positions. Cummins OTEC 480-Volt 225-Amp Automatic Transfer Switches perform a break-before-make action while electrical interlocks prevent interconnection of the normal and emergency signals. High pressure silver alloy contacts resist burning or pitting; arcing surfaces protect the main contacts. Multiple leaf chutes cool and quench arcs, further protecting the contacts. A protective cover allows inspection while preventing accidental contact with energized surfaces.
UL-1008 certification, including the contact assemblies, covers applications requiring high endurance switching capability for the life of the ATS.
| OTEC Transfer Switch Specifications | |
|---|---|
| Voltage Rating | 277/480-Volts 3-Phase AC at 60 Hertz. |
| Transition Modes | Open Delayed; Open-In Phase—capable of programmed transition backup |
| Arc Interruption | Multiple Leave Arc Chutes. |
| Neutral Bar | Rated for Full Current with Lugs—Standard on 3-pole transfer switches. |
| Auxiliary Contacts | Two isolated, normally open contacts for customer use close to indicate switch position. Wired to terminal block, rated at 10A and 250-Volts. |
| Surge Rating | Conforms to IEEEC62.41 and IEEE C62.42 |
| Transfer Time | Total transfer time source to source does not exceed 6 cycles at 60 Hertz (does not include programmed transition). |
| Manual Operation | Manual transfer capable with all sources disconnected |
