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Siemens EH3B040 Molded Case Circuit Breaker
- 40A
- 3 Pole
- Bolt-On
Siemens
EH3B040
Molded Case Circuit Breaker
Brand
Siemens
SKU
EH3B040
Quantity
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Siemens EH3B040 - 40A 3 Pole Molded Case Circuit Breaker
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Description
Operating at up to 480VAC, this 40A thermal-magnetic breaker offers robust overcurrent protection for demanding environments. The three-pole device utilizes fixed thermal and magnetic trip elements to safeguard commercial distribution systems. The bolt-on configuration mounts into Siemens P1, P2, and P3 panelboards, along with vintage ITE load centers. Facilities looking to replace this specific E-frame unit can utilize the newer ED43B040 as a drop-in substitute. Rated 14 kAIC at 480V.Specifications
| Brand | Siemens |
|---|---|
| Part Number | EH3B040-R |
| Series | EH |
| Amperage | 40A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 18kA @ 240VAC, 14kA @ 480VAC, 10kA @ 250VDC |
| Frame Type | EH |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P1, P2, P3 Panelboards, ITE Panelboards |
| Wire Gauge | 14-1/0 AWG (Cu/Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 14 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, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | UL 489, CSA C22.2 No. 5 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Non-Interchangeable Trip |
Product FAQs
6 answersWhich panelboards are compatible with the EH3B040 circuit breaker?
This bolt-on E-frame breaker is designed for installation in Siemens P1, P2, and P3 panelboards. It is also backward compatible with legacy ITE panelboards that accept bolt-on EH frame breakers.
What is the modern replacement for the obsolete EH3B040 breaker?
The Siemens EH frame is a legacy product line. For new installations or direct replacements, the Siemens ED43B040 serves as a drop-in substitute. It shares the same physical footprint and mounting style while providing a higher 18kAIC interrupting rating at 480VAC.
Can the EH3B040 be used in DC electrical systems?
Yes, in addition to its AC ratings, this breaker is rated for use in DC circuits up to 250VDC, providing an interrupting capacity of 10kAIC.
Are the thermal and magnetic trip elements adjustable on this breaker?
No, the EH3B040 is equipped with a fixed thermal-magnetic trip unit. Both the long-time (thermal) and instantaneous (magnetic) trip functions are factory set and cannot be modified in the field.
What conductor types are supported by the standard lugs on the EH3B040?
The factory-installed lugs are dual-rated for both copper and aluminum conductors. They accept wire sizes ranging from 14 AWG up to 1/0 AWG.
What is the advantage of the bolt-on connection for the EH3B040?
Bolt-on breakers like the EH3B040 fasten directly to the panelboard bus with screws. This creates a rigid, high-pressure mechanical connection that prevents arcing and withstands vibration better than plug-on alternatives, making it ideal for commercial and industrial applications.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 7 reviews.
Total 5 star reviews: 7 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
7 reviews
- TSThomas S.Verified BuyerReviewingSiemens EH3B020 - 20A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars11/6/25Great
Thanks
- JMJim M.ReviewingSiemens EH3B040 - 40A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars11/24/23They fit perfectly and saved
They fit perfectly and saved us a lot of money by being able to replace just these breakers
- KHKen H.ReviewingSiemens EH3B030 - 30A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars1/12/23Great service
Great service and products fast shipping
- JSJerry S.ReviewingSiemens / ITE EH3B070 - 70A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars4/20/22Great Price - Breakers Work Fine
My local Supplier was charging me three times the price for a breaker that i bought on super Breakers.
- MRMatt R.ReviewingSiemens EH3B020 - 20A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars7/6/2020 Amp Breaker
Received item quickly and in great shape. Thank you!!!