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Siemens E43B045 Molded Case Circuit Breaker
- 45A
- 3 Pole
- Bolt-On
Siemens
E43B045
Molded Case Circuit Breaker
Brand
Siemens
SKU
E43B045
Quantity
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Siemens E43B045 - 45A 3 Pole Molded Case Circuit Breaker
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Description
Engineered for commercial applications, the Siemens E43B045 delivers robust overcurrent protection. This 3-pole, 45A molded case circuit breaker features a fixed thermal-magnetic trip unit and is HACR rated. The bolt-on design mounts into Siemens Sentron P1, P2, and P3 panelboards, F2 panelboards, and SB switchboards. It serves as a replacement for older E-frame units and is superseded by the ED43B045. With an 18 kAIC rating at 480VAC, it handles demanding electrical distribution tasks.Specifications
| Brand | Siemens |
|---|---|
| Part Number | E43B045 |
| Series | ED |
| Amperage | 45A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 18kA @ 480VAC, 10kA @ 250VDC |
| Frame Type | E4 |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Sentron Panelboards (P1, P2, P3), SB Switchboards, F2 Panelboards |
| 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 | Load Side Lugs |
| Standards | CSA C22.2 No. 5, HACR, IEC 60947-2, NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, HID Rated, Non-Interchangeable Trip |
Product FAQs
7 answersWhat panelboards are compatible with the E43B045?
This bolt-on breaker is designed for use in Siemens Sentron panelboards (P1, P2, and P3), F2 panelboards, and SB switchboards.
Is the E43B045 still manufactured, or is there a direct replacement?
The E43B045 is a discontinued E-frame breaker. It has been superseded by the Siemens ED43B045, which serves as the direct replacement for 45A, 3-pole applications in Sentron panels.
What wire sizes and materials are accepted by the lugs on this breaker?
The factory lugs accept 10 AWG to 1/0 AWG wire and are rated for both copper (Cu) and aluminum (Al) conductors. Ensure proper torque specifications are followed during installation.
Can the E43B045 be used in DC electrical systems?
Yes, this thermal-magnetic breaker is rated for DC applications up to 250VDC, providing an interrupting capacity of 10kAIC at that voltage.
Is the E43B045 suitable for HVAC applications?
Yes, this breaker is HACR rated, making it suitable for use with heating, air conditioning, and refrigeration equipment.
Does this breaker provide both overload and short-circuit protection?
Yes, it features a thermal-magnetic trip unit with fixed long-time (L) and instantaneous (I) trip functions to protect against both overloads and short circuits.
How does the E43B045 connect to the panel bus?
It features a bolt-on connection type, meaning it bolts directly to the panelboard bus for a secure mechanical and electrical connection, rather than snapping onto a DIN rail or plug-in bus.
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Reviews
Review summary
Customers rate this product 4.6 out of 5 based on 7 reviews.
Total 5 star reviews: 6 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 1 Total 1 star reviews: 0
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Rating
7 reviews
- PSpam s.Verified BuyerReviewingEaton / Cutler-Hammer ED3100 - 100A 3 Pole Molded Case Circuit BreakerI do not recommend this productRated 2 out of 5 stars7/28/26Shipment delays
Asked for overnight shipment, got it but the product did not ship for 7 days
- BFBernie F.Verified BuyerReviewingEaton / Cutler-Hammer ED2200 - 200A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars7/27/26Very Responsive
I ordered this breaker. It arrived on time and was exactly what I ordered.
- BFBrian F.ReviewingEaton / Cutler-Hammer ED2200 - 200A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars5/26/22In Stock & Speedy Shipping
Always find in-stock items and shipping is always quick. My go-to for breakers at unbeatable prices.
- LVLue V.ReviewingEaton / Cutler-Hammer ED3175 - 175A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars4/27/22Excellent online service
Thanks for you online services. It was an easy transaction and delivery was right on time.
- NMNick M.ReviewingSiemens E43B030 - 30A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars6/23/20reliable breaker at a good price
I was happy this specialty breaker was available at a good price compared to local suppliers in our area.