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Siemens EF3B020 Molded Case Circuit Breaker
- 20A
- 3 Pole
- Bolt-On
Siemens
EF3B020
Molded Case Circuit Breaker
Brand
Siemens
SKU
EF3B020
Quantity
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Siemens EF3B020 - 20A 3 Pole Molded Case Circuit Breaker
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Description
Engineered for commercial applications, the Siemens EF3B020 is a 3-pole, 20A molded case circuit breaker from the legacy EF frame family. It provides dependable thermal-magnetic trip protection for up to 600VAC systems. This bolt-on unit installs into older Siemens, I-T-E, and FC-1 panelboards, as well as FC-20 switchboards. It is replaced by the modern ED63B020 for system upgrades. Rated at 14kAIC at 480V and 18kAIC at 240V, it features a non-interchangeable trip and is HACR rated.Specifications
| Brand | Siemens |
|---|---|
| Part Number | EF3B020-R |
| Series | EF |
| Amperage | 20A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 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 | 14-10 AWG (Cu), 12-10 AWG (Al) |
| Max Wire | 10 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, Alarm Switch, Undervoltage Release |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | UL 489, CSA C22.2 No. 5 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Non-Interchangeable Trip, HACR Rated |
Product FAQs
6 answersWhich panelboards are compatible with the Siemens EF3B020 circuit breaker?
The EF3B020 is a bolt-on molded case circuit breaker designed for use in legacy Siemens and I-T-E distribution equipment, specifically FC-1 panelboards and FC-20 switchboards.
Is the Siemens EF3B020 a legacy breaker, and what is the modern replacement?
Yes, the EF3B020 is part of the legacy Siemens and I-T-E E-Frame series. For modern panel upgrades or direct replacements, the Siemens ED63B020 serves as the current factory equivalent.
What wire sizes are approved for the load side lugs on the EF3B020?
The included load side lugs accept 14 to 10 AWG copper (Cu) conductors or 12 to 10 AWG aluminum (Al) conductors. Always verify that the wire bending space in your enclosure accommodates these sizes before installation.
Can the EF3B020 be utilized in DC power systems?
Yes, this thermal magnetic breaker is rated for DC applications up to 250VDC, providing an interrupting capacity of 10kA at 250VDC.
How does the EF3B020 mount into the electrical panel?
This is a bolt-on circuit breaker that requires a secure, bolted connection directly to the panelboard busbar. It cannot be used in load centers that require plug-on or snap-in mounting.
Are the trip settings on the EF3B020 adjustable?
No, the EF3B020 features a fixed thermal magnetic trip unit. Both the long-time (thermal) and instantaneous (magnetic) protection functions 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.