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Siemens ED42B045L Molded Case Circuit Breaker
- 45A
- 2 Pole
- Unit Mount
Siemens
ED42B045L
Molded Case Circuit Breaker
Brand
Siemens
SKU
ED42B045L
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Siemens ED42B045L - 45A 2 Pole Molded Case Circuit Breaker
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Description
Engineered for commercial and industrial applications, this 45A Sentron ED4 frame breaker provides thermal-magnetic long-time and instantaneous trip functions. It mounts into standard enclosures or switchboards using the included line and load lugs. Rated for 65kAIC at 240VAC and 18kAIC at 480VAC, it handles demanding electrical distribution tasks. Note that this unit is replaced by the newer 3VA5145-4ED26-0AA0 model for future upgrades.Specifications
| Brand | Siemens |
|---|---|
| Part Number | ED42B045L |
| Series | ED4 |
| Amperage | 45A |
| 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 | Enclosures, Individual Mounting, Switchboards |
| Wire Gauge | 10-1/0 AWG (Cu/Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 10 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, Padlock Attachment |
|---|---|
| Accessories | Line and Load Lugs Included (LN1E100) |
| Standards | CSA C22.2 No. 5, HACR Rated, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Non-Interchangeable Trip |
Product FAQs
7 answersWhat enclosures are compatible with the Siemens ED42B045L circuit breaker?
This ED frame breaker can be installed in Siemens Sentron panelboards, SB switchboards, or standalone enclosures such as the Siemens W53045 or E2N12, depending on your specific application requirements.
What does the L suffix indicate in the ED42B045L catalog number?
The L suffix indicates that the circuit breaker is shipped from the factory with both line and load side lugs pre-installed. The included lugs accept 10 to 1/0 AWG copper or aluminum wire.
What is the difference between Siemens ED4 and ED6 frame circuit breakers?
Both belong to the 125A maximum ED frame family and share the same physical dimensions. The primary difference is their maximum voltage rating. ED4 breakers are rated for up to 480V AC, while ED6 breakers are rated for up to 600V AC.
Can the trip unit on the ED42B045L be swapped or upgraded?
No. Siemens ED frame circuit breakers feature a fixed, non-interchangeable thermal magnetic trip unit. If a different amperage or trip curve is required, the entire breaker must be replaced.
Is the ED42B045L a plug-in or unit mount circuit breaker?
This is a unit mount circuit breaker designed for hardwired, bolt-on installations in switchboards, panelboards, or individual enclosures. It is not a plug-in style breaker.
What replacement lug kit is used for the ED42B045L?
If you need to replace the terminals, the compatible Siemens lug kit for this 45A ED frame breaker is part number LN1E100, which accepts 10 to 1/0 AWG copper or aluminum wire.
Can the ED42B045L be used in series-rated combinations?
Yes, Siemens ED4 breakers can be applied in series-connected systems with upstream fuses (such as Class J) or main breakers to achieve a higher short-circuit current rating than the breaker's standalone 18kAIC at 480V. Always consult Siemens series rating charts or the panel labeling for tested and UL-listed combinations.
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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.