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Siemens EF3B090 Molded Case Circuit Breaker
- 90A
- 3 Pole
- Bolt-On
Siemens
EF3B090
Molded Case Circuit Breaker
Brand
Siemens
SKU
EF3B090
Quantity
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Siemens EF3B090 - 90A 3 Pole Molded Case Circuit Breaker
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Description
Built for legacy power systems, the Siemens EF3B090 is a 90A, 3-pole molded case circuit breaker. It provides reliable overcurrent protection for 600VAC and 250VDC commercial environments. This bolt-on breaker installs into older I-T-E and Siemens enclosures, specifically FC-1 panelboards and FC-20 switchboards. Facilities looking to upgrade can cross-reference this with the newer ED63B090 replacement. It features a fixed thermal-magnetic trip unit with a 14kAIC rating at 480VAC.Specifications
| Brand | Siemens |
|---|---|
| Part Number | EF3B090-R |
| Series | EF |
| Amperage | 90A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 18kA @ 240VAC, 14kA @ 480VAC, 14kA @ 600VAC, 10kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Siemens / I-T-E Panelboards, FC-1 Panelboards, FC-20 Switchboards |
| Wire Gauge | 10-1/0 AWG (Cu), 12-1/0 AWG (Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 10 AWG (Cu), 12 AWG (Al) |
| 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 |
| Standards | UL 489, CSA C22.2 No. 5 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Non-Interchangeable Trip |
Product FAQs
4 answersIs the EF3B090 still manufactured, or is there a direct replacement?
The EF3B090 is a legacy E-frame breaker that has been superseded. Facilities looking to upgrade or replace this unit can cross-reference it with the newer ED63B090 molded case circuit breaker.
Which panelboards and switchboards are compatible with the EF3B090?
This bolt-on breaker is designed for use in older Siemens and I-T-E enclosures, specifically FC-1 panelboards and FC-20 switchboards.
Are the trip settings on the EF3B090 adjustable?
No, this breaker features a non-interchangeable, fixed thermal magnetic trip unit. Both the long-time (thermal) and instantaneous (magnetic) trip functions are factory-set and cannot be adjusted in the field.
Which replacement lug kit is compatible with the EF3B090?
If replacement load-side lugs are needed, the Siemens LN1-E100 aluminum terminal lug kit is compatible with 30A to 100A E, ED, and EF frame breakers.
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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.