Eaton / Cutler-Hammer HMA3800 Molded Case Circuit Breaker
- 800A
- 3 Pole
- Bolt-On
Quantity
Eaton / Cutler-Hammer HMA3800 - 800A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Part of the legacy H-Frame family, the Eaton HMA3800 provides robust protection for commercial and industrial systems. This 3-pole, 800A breaker features a thermal magnetic trip unit with adjustable magnetic settings. Engineered for bolt-on mounting, it fits into older Westinghouse and Eaton panelboards. For modern upgrades, it is replaced by the HMDL3800 model. Featuring Mark 75 high interrupting capacity, it clears faults up to 65kA at 240VAC. Line and load lugs are included.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | HMA3800-R |
| Series | HMA |
| Amperage | 800A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600VAC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 25kA @ 600VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Westinghouse/Eaton Panelboards and Switchboards |
| Wire Gauge | (3) 3/0 AWG - 400 kcmil (Al/Cu) |
| Max Wire | 400 kcmil |
| Min Wire | 3/0 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Line and Load Lugs Included |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | High Interrupting Capacity, Interchangeable Trip Unit |
Product FAQs
9 answersAre Eaton, Cutler-Hammer, and Westinghouse HMA3800 breakers the same?
Yes. Eaton acquired the Westinghouse electrical distribution division. Breakers marked as Westinghouse, Cutler-Hammer, or Eaton with the HMA3800 or HMA-3800 catalog number are the exact same form, fit, and function.
What wire size and material can be used with the standard lugs on the HMA3800?
The standard line and load lugs accept three 3/0 AWG to 400 kcmil conductors per phase. These terminals are rated for both aluminum and copper wire.
How does the adjustable magnetic trip function work on this breaker?
While the thermal overload protection is fixed at 800 amps, the instantaneous magnetic trip can be adjusted between 3000 and 6000 amps. This allows for better coordination with downstream devices and specific inrush currents.
What type of enclosures or panels accept the HMA3800?
This bolt-on breaker is designed for installation in legacy Westinghouse, Cutler-Hammer, and Eaton switchboards or large power distribution panelboards configured for HMA or H-Frame molded case circuit breakers.
Does the HMA3800 include ground fault equipment protection?
No. This is a standard thermal-magnetic breaker with Long-Time and Instantaneous (LI) trip functions. It does not have built-in ground fault protection.
What is the difference between the asymmetrical and symmetrical interrupting ratings listed for this breaker?
Symmetrical ratings (such as 65kA at 240VAC) represent the steady-state fault current the breaker can safely clear. Asymmetrical ratings (such as 75kA at 240VAC) account for the initial DC offset during a fault. Standard UL panel ratings typically rely on the symmetrical values for short-circuit coordination.
Can I replace an older MA3800 with this HMA3800?
Yes. The HMA3800 shares the same physical dimensions (8-1/4 inches wide, 4-1/16 inches deep, and 16 inches high) as the standard MA3800 but offers a higher interrupting capacity. It can be used as a direct upgrade where higher fault current ratings are required.
How is the HMA3800 mounted in a panel?
The HMA3800 is a bolt-on circuit breaker. It secures directly to the busbars in compatible Eaton or Westinghouse panelboards and switchboards using mounting bolts, ensuring a robust and reliable electrical connection.
What does the Mark 75 designation mean on this breaker?
The Mark 75 branding indicates that the breaker has a high interrupting capacity, specifically an asymmetrical interrupting rating of 75,000 amps (75kA) at 240 VAC.
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