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Siemens HED43B125L Molded Case Circuit Breaker
- 125A
- 3 Pole
- Unit Mount
Siemens
HED43B125L
Molded Case Circuit Breaker
Brand
Siemens
SKU
HED43B125L
Quantity
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Siemens HED43B125L - 125A 3 Pole Molded Case Circuit Breaker
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Description
Part of the Sentron ED-frame family, this 125A molded case circuit breaker delivers robust high-interrupting capacity for demanding industrial environments. The unit-mount configuration features factory-installed line and load lugs, making it ready for integration into commercial enclosures and motor control centers. While this specific HED4 series model has been succeeded by the 3VA5 architecture, it remains a critical component for maintaining existing 480VAC systems requiring 42kAIC ratings.Specifications
| Brand | Siemens |
|---|---|
| Part Number | HED43B125L |
| Series | HED4 |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 42kA @ 480VAC, 30kA @ 250VDC |
| Frame Type | ED |
|---|---|
| Terminal Type | Lugs |
| For Use With | Enclosures, Switchboards, Motor Control Centers |
| Wire Gauge | 3-3/0 AWG (Cu), 1-2/0 AWG (Al) |
| Max Wire | 3/0 AWG |
| Min Wire | 3 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, Undervoltage Release |
|---|---|
| Accessories | Line and Load Side Lugs |
| Standards | CSA C22.2 No. 5, HACR Rated, IEC 60947-2, UL 489 |
| Approval | CSA, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, Reverse Feed, Non-Interchangeable Trip |
Product FAQs
6 answersWhat equipment is compatible with the HED43B125L circuit breaker?
This Sentron ED frame breaker is designed for installation in Siemens enclosures, switchboards, and motor control centers that accept unit mount breakers.
What does the "H" in the HED43B125L catalog number signify?
The "H" designates a high-interrupting capacity breaker. This model provides a 42 kAIC rating at 480V AC, which is higher than standard ED4 frame breakers.
What does the "L" suffix in HED43B125L indicate?
The "L" suffix means the breaker is factory-supplied with lugs on both the line and load sides. Standard Siemens ED frame breakers are typically supplied with load side lugs only.
What wire sizes and materials are supported by the HED43B125L lugs?
The factory-installed lugs accept 3 to 3/0 AWG copper (Cu) wire and 1 to 2/0 AWG aluminum (Al) wire.
How is the HED43B125L physically mounted?
It is a unit mount, feed-thru circuit breaker. It bolts directly to the backpan or mounting surface rather than plugging into a busbar system.
Can the HED43B125L be used to replace older ED frame breakers?
Yes, it shares the same physical dimensions and mounting footprint as legacy Siemens Sentron ED4 and HED4 frame breakers, making it a direct replacement for 125A, 3-pole applications.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 13 reviews.
Total 5 star reviews: 13 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
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Rating
13 reviews
- PMPete M.Verified BuyerReviewingSiemens HED43B060 - 60A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/19/26Good price - Best website
Awesome price on an item. easy to use website made finding the right breaker and purchasing it super easy
- BCBrad C.Verified BuyerReviewingSiemens HED43B070 - 70A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars5/12/26Thank You
The breaker works perfectly, but I'm more impressed by the fast, prompt delivery. Will be using you again, thank you.
- MLMichael L.Verified BuyerReviewingSiemens HED43B020 - 20A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars4/15/26Siemens breaker
Return customer, always great service and quick delivery. A+++
- JMJonathan M.Verified BuyerReviewingSiemens HED43B030 - 30A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars2/10/26Breaker
Fast Delivery, just what I ordered !!
- RFRussell F.Verified BuyerReviewingSiemens HED41B040 - 40A 1 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars2/6/26Just what I ordered
Straight forward, simple process. On time delivery.