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Siemens EF3B030 Molded Case Circuit Breaker
- 30A
- 3 Pole
- Bolt-On
Siemens
EF3B030
Molded Case Circuit Breaker
Brand
Siemens
SKU
EF3B030
Quantity
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Siemens EF3B030 - 30A 3 Pole Molded Case Circuit Breaker
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Description
Built for heavy-duty commercial environments, this 30A E-frame device offers robust thermal-magnetic trip capabilities. It serves as a reliable component for older infrastructure requiring specific legacy form factors. The bolt-on configuration installs seamlessly into compatible Siemens and I-T-E panelboards. Facility managers should note that this exact unit is replaced by the ED63B030 for newer installations. It delivers an 18kAIC rating at 240VAC and supports 14-10 AWG conductors.Specifications
| Brand | Siemens |
|---|---|
| Part Number | EF3B030-R |
| Series | EF |
| Amperage | 30A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 18kA @ 240VAC, 14kA @ 480VAC, 14kA @ 600VAC, 10kA @ 250VDC |
| Frame Type | EF |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens / I-T-E Panelboards, Switchboards |
| Wire Gauge | 14-10 AWG (Cu/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 | NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Non-Interchangeable Trip |
Product FAQs
5 answersWhich panelboards are compatible with the EF3B030 circuit breaker?
This legacy E-frame breaker is designed to bolt directly into classic I-T-E and Siemens P-series panelboards and switchboards.
Is the Siemens EF3B030 still in active production, or is there a direct replacement?
The EF3B030 is a legacy E-frame breaker. For newer installations or if this exact form factor is not required, it is commonly replaced by the ED63B030, which offers a higher interrupting capacity while maintaining the same 30A, 3-pole configuration.
What type of wire can be used with the lugs on the EF3B030?
The factory lugs on this breaker accept 14 to 10 AWG copper or aluminum (Cu/Al) conductors. Ensure proper torque is applied during installation as specified on the breaker faceplate.
Can the EF3B030 be used in DC applications?
Yes, in addition to its AC ratings up to 600VAC, this thermal magnetic breaker is rated for 250VDC systems with an interrupting capacity of 10kAIC.
Does the EF3B030 feature adjustable trip settings?
No, this breaker utilizes a fixed thermal and fixed magnetic (LI) trip unit. It does not allow for field adjustments to the long-time or instantaneous trip thresholds.
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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.