Eaton / Cutler-Hammer HMA3700 Molded Case Circuit Breaker
- 700A
- 3 Pole
- Bolt-On
Quantity
Eaton / Cutler-Hammer HMA3700 - 700A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Designed to handle demanding electrical loads, the Eaton HMA3700 is a 3-pole, 700A molded case circuit breaker providing dependable thermal-magnetic protection. This bolt-on breaker integrates into legacy Westinghouse and Eaton switchboards. When maintaining older systems, users can substitute it with the newer HMDL3700. With a 65kAIC rating at 240V, the Mark 75 unit ensures superior fault clearing and includes necessary terminal lugs.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | HMA3700-R |
| Series | HMA |
| Amperage | 700A |
| 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 |
| 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
8 answersWhat is the modern replacement for the legacy HMA3700 circuit breaker?
The HMA3700 is a legacy breaker. For modern replacements in existing switchboards, Eaton recommends the MDL3700 or HMDL3700 series, which may require specific retrofit mounting hardware depending on your panel configuration.
What is the magnetic trip adjustment range for the HMA3700?
The instantaneous magnetic trip function on this 700A breaker is adjustable from 3000 to 6000 amps, allowing for precise short-circuit protection coordination within your electrical system.
Can I install the HMA3700 in older Westinghouse switchboards?
Yes, the HMA3700 is fully compatible with legacy Westinghouse, Cutler-Hammer, and Eaton switchboards designed to accept H-frame molded case circuit breakers.
Is the thermal trip unit on the HMA3700 adjustable?
No, the thermal element for long-time overload protection is fixed at 700 amps. Only the instantaneous magnetic trip setting can be adjusted in the field.
Does the HMA3700 include terminal lugs?
Yes, this breaker is supplied with line and load lugs ready for bolt-on installation. Ensure proper torque specifications are followed when terminating cables to the lugs.
Can the trip unit be replaced on the HMA3700?
Yes, the HMA3700 features an interchangeable thermal-magnetic trip unit, allowing licensed electricians to replace or upgrade the trip mechanism without removing the entire breaker frame from the switchboard.
What does the Mark 75 designation indicate on this breaker?
The Mark 75 label signifies a high-interrupting capacity breaker. For the HMA3700, this provides a 65kA interrupting rating at 240VAC, offering superior fault clearing compared to standard-rated breakers.
What safety standards does the HMA3700 meet?
This breaker is UL listed and CSA certified for use in low voltage distribution systems, ensuring safe operation for closing and interrupting circuits under normal and abnormal conditions.
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