Eaton / Cutler-Hammer EP3125 Molded Case Circuit Breaker
- 125A
- 3 Pole
- Plug-On
Quantity
Eaton / Cutler-Hammer EP3125 - 125A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Designed for 3-phase power distribution, the Eaton EP3125 is a 125A main circuit breaker. It provides essential long-time and instantaneous (LI) protection for both residential and commercial electrical systems. This plug-on breaker is engineered to fit into Siemens and Murray EQ III load centers. It serves as an effective alternative to the QPJ3125. Operating at 240VAC, the unit delivers a standard 10kAIC interrupt rating. It comes equipped with factory-installed lugs and is HACR rated.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | EP3125 |
| Series | EP |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Plug-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Frame Type | EP |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens / Murray EQ III Load Centers |
| Wire Gauge | 4 AWG - 2/0 AWG (Cu/Al) |
| Max Wire | 2/0 AWG |
| Min Wire | 4 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, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Lugs Included |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Common Trip |
Product FAQs
6 answersCan I install the Eaton EP3125 in any 3-phase panel?
No, this breaker is specifically designed for use with Siemens and Murray EQ III load centers. You must verify that your panel's label lists EP frame breakers as an approved type.
What are the wire gauge requirements for installing the EP3125?
The terminal lugs are rated for 4 AWG to 2/0 AWG conductors. They are compatible with both copper and aluminum wiring, but ensure proper torque specifications are followed during installation.
What type of fault protection does the EP3125 provide?
It features a fixed thermal-magnetic trip unit with long-time and instantaneous (LI) functions. The thermal element protects against sustained overloads, while the magnetic element trips instantly during short circuits.
How is the EP3125 installed into a load center?
It features a plug-on connection, meaning it snaps directly onto the panel busbar without requiring bolted connections. Ensure the panel is de-energized before seating the breaker.
Is the EP3125 intended for branch circuit or main breaker applications?
This specific model is categorized for use as a main breaker in compatible 3-phase Siemens and Murray EQ III load centers.
What safety precautions should be taken before installing this main breaker?
Installation should only be performed by a licensed electrician. Ensure the main power feed to the load center is completely de-energized and verified with a reliable voltage tester before seating the plug-on breaker.
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