Eaton / Cutler-Hammer DA3400 Molded Case Circuit Breaker
- 400A
- 3 Pole
- Bolt-On
Quantity
Eaton / Cutler-Hammer DA3400 - 400A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Operating as a high-capacity protective device, the Eaton DA3400 delivers 400A of thermal-magnetic protection for demanding industrial environments. This 3-pole legacy AB De-Ion breaker features a non-interchangeable trip unit and supports reverse feed applications. It mounts securely into vintage Westinghouse CDP panelboards, FDP switchboards, and Eaton enclosures. Facilities looking to modernize often cross-reference this unit to the newer DK3400 replacement.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | DA3400-R |
| Series | DA |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 22kA @ 240VAC, 10kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Westinghouse CDP Panelboards, FDP Switchboards, Eaton Panelboards |
| Wire Gauge | (2) 3/0 AWG-250 kcmil (Cu) |
| Max Wire | 250 kcmil |
| Min Wire | 3/0 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Lug Kits, Alarm Switch |
|---|---|
| Accessories | Standard Pressure Terminal (T400DA2) |
| Standards | Federal Specification W-C-375b, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Non-Interchangeable Trip, Reverse Feed |
Product FAQs
9 answersWhat is the modern replacement for the legacy DA3400 circuit breaker?
Facilities looking to modernize or replace this legacy D-Frame breaker often cross-reference it to the newer DK3400. Always verify panel clearances and interrupting ratings before substituting.
Is the Eaton DA3400 the exact same breaker as the Westinghouse DA3400?
Yes. Eaton acquired the Westinghouse distribution equipment business in the early 1990s. The Cutler-Hammer and Eaton DA3400 models are direct, exact replacements for the original Westinghouse DA3400.
Can the DA3400 be used in reverse feed applications?
Yes, this breaker supports reverse feed applications, making it suitable for use as a main breaker or in back-fed configurations where permitted by local electrical codes.
Is the trip unit on the DA3400 interchangeable?
No, this breaker features a non-interchangeable thermal-magnetic trip unit with fixed long-time and instantaneous (LI) functions. If different trip characteristics are required, the entire breaker must be replaced.
What protection functions are included in the LI trip unit?
The LI designation indicates that the thermal-magnetic trip unit provides Long-Time (L) protection against sustained overloads and Instantaneous (I) protection for immediate short-circuit clearing. Both functions are fixed on this model.
What regulatory standards does the DA3400 comply with?
This breaker is certified to meet UL 489 and CSA standards for molded case circuit breakers. It also complies with NEMA AB 1 and Federal Specification W-C-375b for industrial and commercial applications.
Can I add auxiliary switches or a shunt trip to the DA3400?
Yes, this D-Frame breaker supports various internal accessories, including shunt trips, auxiliary switches, undervoltage releases, and alarm switches. These are typically factory-installed or require specific field-installable kits.
Does this breaker include lugs for both line and load sides?
The DA3400 is a bolt-on breaker designed to connect directly to the panelboard bus on the line side. It comes equipped with standard pressure terminals on the load side, which accept two 3/0 AWG to 250 kcmil copper wires per phase.
What is the standard ambient temperature rating for this breaker?
The DA3400 is calibrated for operation in a 40 degrees Celsius (104 degrees Fahrenheit) ambient temperature environment, which is standard for thermal-magnetic breakers in this class.
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