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Siemens ED42B125L Molded Case Circuit Breaker
- 125A
- 2 Pole
- Unit Mount
Siemens
ED42B125L
Molded Case Circuit Breaker
Brand
Siemens
SKU
ED42B125L
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Siemens ED42B125L - 125A 2 Pole Molded Case Circuit Breaker
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Description
Built for standalone industrial applications, this 125A unit mount breaker delivers dependable thermal-magnetic trip functionality. The "L" suffix designates the inclusion of both line and load lugs, making it ready for installation into individual enclosures and switchboards. It provides a robust 65kAIC interrupting capacity at 240VAC and supports reverse feed configurations. This Sentron ED4 frame component ensures strict compliance with UL 489 standards for heavy-duty electrical systems.Specifications
| Brand | Siemens |
|---|---|
| Part Number | ED42B125L |
| Series | ED4 |
| Amperage | 125A |
| Poles | 2 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 250VDC |
| Phase | 1 |
| AIC Rating | 65kA @ 240VAC, 18kA @ 480VAC, 30kA @ 250VDC |
| Frame Type | ED |
|---|---|
| Terminal Type | Lugs |
| For Use With | Individual Enclosures, Switchboards |
| Wire Gauge | 3-3/0 AWG (Cu), 1-2/0 AWG (Al) |
| Max Wire | 3/0 AWG (Cu), 2/0 AWG (Al) |
| Min Wire | 3 AWG (Cu), 1 AWG (Al) |
| 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, Undervoltage Release |
|---|---|
| Accessories | Line & Load Lugs (TA1E6125) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Non-Interchangeable Trip |
Product FAQs
6 answersCan the Siemens ED42B125L replace older I-T-E circuit breakers?
Yes. Siemens acquired I-T-E and continues to manufacture the ED4 frame. The ED42B125L serves as a direct replacement for legacy I-T-E ED4 breakers with matching specifications.
What does the L suffix in the ED42B125L catalog number indicate?
The L signifies that the breaker is supplied with factory-installed line and load side lugs.
What wire sizes are compatible with the lugs on the ED42B125L?
The standard lugs accept 3 to 3/0 AWG copper wire or 1 to 2/0 AWG aluminum wire. Installers must apply the specific torque values printed on the breaker faceplate.
Is the ED42B125L suitable for DC power systems?
Yes, this thermal magnetic breaker is rated for DC applications up to 250VDC, where it provides a 30kA interrupting capacity.
Where is the ED42B125L typically installed?
As a unit mount, feed-thru breaker, it is designed for installation in Siemens switchboards and individual enclosures rather than standard load centers.
Are the trip settings adjustable on the ED42B125L?
No. This breaker features a fixed thermal and fixed magnetic trip unit, providing standard long-time and instantaneous (LI) protection without adjustable dials.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 20 reviews.
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Rating
20 reviews
- GGGerson G.Verified BuyerReviewingSiemens ED43B100 - 100A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/8/26Siemens ED43B100 breeaker
Breaker arrived even earlier than expected. In great condition and very well packaged. Customer service was helpful and resolve all questions.
- KLKristofer L.Verified BuyerReviewingSiemens ED43B015 - 15A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/1/26Product delivered was perfect.
This was my first order with Super Breakers so you just don't know what you will get. My products came quickly and just as described. I was very pleased with my experience and will use them in the future.
- SWScott W.Verified BuyerReviewingSiemens ED43S100A - 100A 3 Pole Molded Case SwitchI recommend this productRated 5 out of 5 stars6/10/26Great transaction
We received the breaker we needed in great shape and in a timely manner!
We will defiantly be ordering from Super breaker again.
- KKKurt k.Verified BuyerReviewingSiemens ED43B080 - 80A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars5/18/26Fast shipping
I needed the breaker quickly for a job. It arrived earlier than I expected which kept the job moving along.
- MSmark s.Verified BuyerReviewingSiemens ED41B020 - 20A 1 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars3/16/26Exactly what I ordered
I ordered 12 Siemens breakers. My order was exactly what I ordered, They came fast, and everything was in good shape. I will be using superbreakers in the future.