Cummins 400 Amp Automatic Transfer Switch — OTEC400 (NSE) Lead time = 13 to 16 weeks Keep critical loads online with the Cummins 400 Amp Automatic Transfer Switch (OTEC400, NSE). Built for dependable, seamless transfer between utility and generator power, this 400A ATS comes in your choice of NEMA 1 (indoor) or NEMA 3R (outdoor) enclosures, multiple voltages, and both 3-phase and 1-phase configurations. As an Authorized Cummins Dealer, AllProGenerators.com provides expert guidance and phone support to help you choose the right option for your installation. Browse the full Cummins generator & accessories collection. Available Models (8 Options) MPN Model Phase Amps Voltage Enclosure A075F127 OTEC400 (NSE) 3-Phase 400A 208V NEMA 1 (Indoor) A075F128 OTEC400 (NSE) 3-Phase 400A 240V NEMA 1 (Indoor) A075F129 OTEC400 (NSE) 3-Phase 400A 480V NEMA 1 (Indoor) A075F130 OTEC400 (NSE) 3-Phase 400A 208V NEMA 3R (Outdoor) A075F131 OTEC400 (NSE) 3-Phase 400A 240V NEMA 3R (Outdoor) A075F132 OTEC400 (NSE) 3-Phase 400A 480V NEMA 3R (Outdoor) A075F133 OTEC400 (NSE) 1-Phase 400A 240V NEMA 1 (Indoor) A075F134 OTEC400 (NSE) 1-Phase 400A 240V NEMA 3R (Outdoor) NSE = Non-Service Entrance. Always verify local code requirements and compatibility with your generator and load center. Key Highlights 400 Amp capacity for robust residential and light commercial standby systems Automatic transfer from utility to generator power with minimal interruption Multiple configurations: 1-phase or 3-phase, 208/240/480V NEMA 1 (indoor) or NEMA 3R (outdoor) weather-resistant enclosure Engineered by Cummins — a global leader in power generation Clean wiring layout for installers and straightforward serviceability Authorized dealer support from AllProGenerators.com Specifications Manufacturer Cummins Power Generation Series OTEC (Automatic Transfer Switch) Model OTEC400 (NSE) Amperage 400A Voltage Options 208V, 240V, 480V (see variant table) Phase Options 1-Phase (240V) and 3-Phase (208V/240V/480V) Enclosure NEMA 1 (Indoor) or NEMA 3R (Outdoor) Operation Automatic transfer between utility and generator Application Residential / Light Commercial standby power Compliance Refer to local code & inspector requirements Need help choosing? Call our U.S. team for personalized guidance. We’ve supported Cummins customers since 2018 with real phone support and fast fulfillment. Frequently Asked Questions Q: What’s the difference between NEMA 1 and NEMA 3R?A: NEMA 1 is for indoor installs. NEMA 3R is outdoor-rated and protects against rain and ice. Q: Should I choose 1-phase or 3-phase?A: Most homes are 1-phase (240V). Many commercial sites require 3-phase (208/240/480V). Your electrician can confirm. Q: What does “NSE” mean?A: Non-Service Entrance (no integral main disconnect). If a service-entrance rated switch is required by code, consult your AHJ/electrician. Q: Is this compatible with all Cummins generators?A: It’s designed for Cummins standby systems. Confirm the generator voltage/phase and control wiring with your installer. Q: Lead times and shipping?A: Lead times vary by configuration. Contact us for current availability and freight options. 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NEMA 3R is designed for outdoor use and protects against rain and ice."}}, {"@type":"Question","name":"Should I choose 1-phase or 3-phase?","acceptedAnswer":{"@type":"Answer","text":"Most homes use 1-phase 240V. Many commercial sites require 3-phase 208/240/480V. Confirm with your electrician."}}, {"@type":"Question","name":"What does “NSE” mean?","acceptedAnswer":{"@type":"Answer","text":"NSE stands for Non-Service Entrance (no integral main disconnect). Check local code for service-entrance requirements."}}, {"@type":"Question","name":"Is this compatible with all Cummins generators?","acceptedAnswer":{"@type":"Answer","text":"It’s designed for Cummins standby systems. Match voltage/phase and controls with your specific generator model."}}, {"@type":"Question","name":"What are the lead times?","acceptedAnswer":{"@type":"Answer","text":"Lead times vary by configuration. Contact AllProGenerators.com for current availability and freight options."}} ] }
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