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Siemens EF3B100 Molded Case Circuit Breaker
- 100A
- 3 Pole
- Bolt-On
Siemens
EF3B100
Molded Case Circuit Breaker
Brand
Siemens
SKU
EF3B100
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Siemens EF3B100 - 100A 3 Pole Molded Case Circuit Breaker
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Description
Engineered for commercial applications, the Siemens EF3B100 is a 3-pole, 100A molded case circuit breaker operating up to 600VAC. It provides reliable long-time and instantaneous (LI) trip functions. This bolt-on unit fits legacy Siemens, I-T-E, and FC-1 panelboards, plus FC-20 switchboards. As an older E-Frame model, it is officially replaced by the ED63B100. Rated at 14kAIC at 480VAC, it features fixed thermal-magnetic settings and includes load side lugs.Specifications
| Brand | Siemens |
|---|---|
| Part Number | EF3B100-R |
| Series | EF |
| Amperage | 100A |
| 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 | 14-1/0 AWG (Cu), 12-1/0 AWG (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, NEMA AB-1 |
| Approval | UL, CSA |
| Temp Rating | 40C |
| Construction Features | Non-Interchangeable Trip |
Product FAQs
6 answersIs the EF3B100 an obsolete breaker, and is there a direct replacement available?
Yes, the EF3B100 is a legacy E-frame circuit breaker that is no longer in active production. Siemens officially replaced this model with the ED63B100, which serves as a direct cross-reference for older I-T-E and Siemens hardware.
Which specific panelboards and switchboards are compatible with the EF3B100?
This breaker is specifically designed for integration into legacy infrastructure. It mounts securely into Siemens and I-T-E FC-1 panelboards, as well as FC-20 switchboards.
How are the line and load side connections configured on the EF3B100?
This is a bolt-on branch breaker. The line side bolts directly onto the panel bus to establish the electrical connection, while the load side is equipped with lug terminals for field wiring.
Can the EF3B100 be deployed in direct current (DC) circuits?
Yes, this thermal magnetic breaker is rated for DC applications up to 250VDC with a 10kA interrupting capacity, making it suitable for select industrial DC control or power circuits.
What are the acceptable wire sizes for the load terminals on the EF3B100?
The factory load side lugs accept 14 to 1/0 AWG copper (Cu) conductors or 12 to 1/0 AWG aluminum (Al) conductors. Adhering to these limits is necessary for proper seating and code compliance.
Are the trip setpoints field-adjustable on the EF3B100?
No, this breaker utilizes a fixed thermal and fixed magnetic trip unit. The long-time and instantaneous (LI) protection parameters are factory-set and cannot be adjusted in the field.
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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.