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Siemens / ITE EF2B050 Molded Case Circuit Breaker
- 50A
- 2 Pole
- Unit Mount
Siemens / ITE
EF2B050
Molded Case Circuit Breaker
Brand
Siemens / ITE
SKU
EF2B050
Quantity
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Siemens / ITE EF2B050 - 50A 2 Pole Molded Case Circuit Breaker
Re-Certified
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Description
Designed specifically for older commercial facilities, this 50A unit mount breaker offers standard long-time and instantaneous trip functions. It is ideal for industrial applications utilizing legacy Siemens equipment. The E-Frame footprint fits classic ITE FC, FCI, and CDP panelboards. It provides an exact physical match for older systems, while the ED62B050 serves as the modern cross-reference substitute.Specifications
| Brand | Siemens / ITE |
|---|---|
| Part Number | EF2B050-R |
| Series | EF |
| Amperage | 50A |
| 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
6 answersWhich panelboards accept the EF2B050 circuit breaker?
This breaker is designed for installation in legacy ITE and Siemens FC, FCI, and CDP series panelboards.
What type of mounting connection is required for this breaker?
The EF2B050 is a unit mount breaker that requires a bolt-on connection directly to the panelboard bus.
What conductor sizes are supported by the standard lugs?
The factory lugs on this breaker accept 10 AWG through 1/0 AWG copper or aluminum wire.
Are the thermal and magnetic trip functions adjustable?
No, this breaker is equipped with fixed thermal and fixed magnetic trip elements. The long-time and instantaneous trip points cannot be modified.
Can the EF2B050 be utilized in direct current applications?
Yes, it is rated for use in DC systems up to 250VDC, where it provides a 10kA interrupting capacity.
Is the ITE EF frame series still in active production?
The EF frame is a legacy molded case circuit breaker family. It is primarily sourced to maintain and service existing ITE or Siemens electrical infrastructure.
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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.