Reliable Emergency Power Transfer for Commercial Applications

The Cummins OTEC125 Spec C transfer switch delivers dependable automatic power transfer when your facility needs it most. Engineered for commercial and light industrial environments, this 125-amp, three-phase transfer switch seamlessly monitors your primary power source, starts your generator, and transfers loads during outages—keeping your operations running without interruption.

Now featuring the enhanced PowerCommand® 40-11 control with intuitive LCD display and software-enabled settings for faster installation and precision configuration.

Why Choose the OTEC125?

Smart Microprocessor Control

The integrated PowerCommand® 40-11 control gives you complete visibility and control over your emergency power system. The digital LCD display and tactile soft-switches make operation simple, while comprehensive monitoring ensures you're always aware of system status.

Advanced Linear Motor Actuator

Unlike traditional gear-driven switches, the OTEC125 uses a bi-directional linear motor actuator that delivers smooth, friction-free transfer action with constant force. This advanced mechanism reduces wear, increases reliability, and ensures consistent performance over thousands of transfer cycles.

Built for Easy Service

• Plug connections eliminate hardwired control panels
• Door-mounted controls provide instant access without opening the enclosure
• Spacious interior layout simplifies wiring and maintenance
• Clear terminal markings reduce installation time and errors

Safety-First Design

Dual mechanical and electrical interlocking prevents dangerous source-to-source connections, protecting your equipment and personnel. The manual operating handle allows safe switching under de-energized conditions when needed.

Technical Specifications

• Voltage: 120/208V, 3-Phase
• Current Rating: 125 Amperes
• Enclosure: NEMA3R (Weather Resistant)
• Service Rating: Non-Service Rated
• Control: PowerCommand® 40-11
• Series: OTEC (Spec C)
• Dimensions: 34" H × 26.5" W × 12.5" D
• Weight: 229 lbs

Codes and Standards

• UL - UL 1008 Listed with UL 50E Type Cabinets and UL Listed CU-AL terminals.
• NEMA - Compliance with NEMA ICS 10.
• CSA - Certified to CSA 22.2.
• IEEE - Compliance with IEEE 446 for Emergency and Standby Power Applications.
• NFPA - Compliance with NFPA 70, 99, and 110 (Level 1).
• NEC - Suitable for use in Emergency, Legally Required Standby and Critical Power Systems per NEC 700, 701, 702, and 708.
• EMC - Meets Electromagnetic Compatibility (EMC) standards for Generic Immunity and Emissions Standards for Industrial environment.
• IBC - Certified to IBC Seismic 2021. 

Ideal Applications

• Emergency Power Systems – Hospitals, data centers, emergency services
• Legally Required Standby – Exit lighting, fire alarms, emergency ventilation
• Optional Standby Circuits – HVAC systems, elevators, security systems
• Commercial Buildings – Office buildings, retail centers, warehouses
• Light Industrial Facilities – Manufacturing plants, food processing, distribution centers

What's Included

• OTEC125 Automatic Transfer Switch with NEMA3R weatherproof enclosure
• PowerCommand® 40-11 digital control with LCD display
• Manual operating handle for emergency use
• Installation and operation manual
• Cummins factory warranty