(954) 249-2314
Cummins 400 Amp Automatic Transfer Switch — OTEC400 (NSE)
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.
| Shipping | This item ships to |
 |
Fast Shipping in the USA. Items ship the same or next day We process orders 7 days a week to ensure the fastest shipping possible. All generators are shipped as fast as possible out of several US locations to ensure the fastest delivery. |
|
 |
We Put Our Customers First We have done the research for you to find the best manufacturers with the best warranties. Every unit on our site is covered by a high quality manufacturers warranty. |
|
 |
We offer the absolute lowest price we can offer |
|
 |
We insist that you love our service. If you're unhappy for any reason whatsoever, just let us know and we'll bend over backwards to make things right again. |
|
 |
Ordering from AllProGenerators.com is 100% safe and secure so you can rest easy. Your personal details are never shared, sold or rented to anyone either. |
Description
Cummins 400 Amp Automatic Transfer Switch — OTEC400 (NSE)
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.
Shipping
| Shipping | This item ships to |
Delivery
|
Fast Shipping in the USA. Items ship the same or next day We process orders 7 days a week to ensure the fastest shipping possible. All generators are shipped as fast as possible out of several US locations to ensure the fastest delivery. |
|
Why Buy From Us
|
We Put Our Customers First We have done the research for you to find the best manufacturers with the best warranties. Every unit on our site is covered by a high quality manufacturers warranty. |
|
|
We offer the absolute lowest price we can offer |
|
|
We insist that you love our service. If you're unhappy for any reason whatsoever, just let us know and we'll bend over backwards to make things right again. |
|
|
Ordering from AllProGenerators.com is 100% safe and secure so you can rest easy. Your personal details are never shared, sold or rented to anyone either. |
Review
Zendure SuperBase V4600 Power Station With 400 Watt Solar Panel Solar Generator
Zendure SuperBase V4600 + Soalr Panel(s) - choose from 1 to 4 Soalr Panels
Wildcat 10kW Renegade 3ph Tier 4F Diesel Generator
Choose Voltage and Enclosure or No Enclosure (Skid Mount)
PAGURO 4000W Marine Diesel Generator
options/Select one of the following pre-wired AC options:
EcoFlow DELTA Pro with Smart Extra Battery and 400W Solar Panel
Select Number of Solar Panels
Related Products
