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Siemens / ITE EF2B040 Molded Case Circuit Breaker
- 40A
- 2 Pole
- Unit Mount
Siemens / ITE
EF2B040
Molded Case Circuit Breaker
Brand
Siemens / ITE
SKU
EF2B040
Quantity
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Siemens / ITE EF2B040 - 40A 2 Pole Molded Case Circuit Breaker
Re-Certified
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Description
Mounting into classic ITE panelboards, the Siemens EF2B040 is a legacy 2-pole, 40A molded case circuit breaker designed for 600VAC and 250VDC systems. Featuring a non-interchangeable thermal-magnetic trip unit, it delivers standard long-time and instantaneous (LI) protection. This E-frame breaker offers a hassle-free replacement solution for discontinued FC, FCI, and CDP enclosures. It provides an 18 kAIC rating at 240VAC and can be crossed to the newer ED62B040 if required.Specifications
| Brand | Siemens / ITE |
|---|---|
| Part Number | EF2B040-R |
| Series | EF |
| Amperage | 40A |
| Poles | 2 |
| Mounting Style | Unit Mount |
| Voltage | 600VAC, 250VDC |
| Phase | 1 |
| AIC Rating | 18kA @ 240VAC, 14kA @ 480VAC, 14kA @ 600VAC, 10kA @ 250VDC |
| Frame Type | EF |
|---|---|
| Terminal Type | Lugs |
| For Use With | ITE / Siemens FC, FCI, CDP 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 |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Non-Interchangeable Trip |
Product FAQs
5 answersWhich panelboards accept the EF2B040 circuit breaker?
This bolt-on breaker is designed specifically for installation in legacy ITE and Siemens FC, FCI, and CDP panelboards.
What is the modern replacement for the EF2B040?
The EF2B040 is a legacy E-Frame breaker. If you need a current production substitute, it can be crossed to the newer Siemens ED62B040 molded case circuit breaker.
Is the EF2B040 suitable for direct current (DC) applications?
Yes, in addition to its 600VAC rating, this thermal-magnetic breaker is rated for use in 250VDC systems with a 10 kAIC interrupting capacity.
What wire sizes and materials are compatible with the terminals on this breaker?
The EF2B040 is equipped with lugs that accept 10 AWG through 1/0 AWG wire. The terminals are rated for both copper (Cu) and aluminum (Al) conductors.
Are the trip settings on the EF2B040 adjustable?
No, this breaker features a non-interchangeable thermal-magnetic trip unit with fixed long-time and fixed instantaneous (LI) trip functions.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 2 reviews.
Total 5 star reviews: 2 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
2 reviews
- VGVictor G.Verified BuyerRated 5 out of 5 stars11/6/25Breakers fit my needs
I wish I would of shopped this I found exact breaker for 400.00 cheaper
- RFRobert F.ReviewingSiemens EF3A100 - 100A 3 Pole Motor Circuit ProtectorI recommend this productRated 5 out of 5 stars7/25/22Fast order and service for a part in good condition
Fast order and service for a part in good condition.