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Siemens EF3B070 Molded Case Circuit Breaker
- 70A
- 3 Pole
- Bolt-On
Siemens
EF3B070
Molded Case Circuit Breaker
Brand
Siemens
SKU
EF3B070
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Siemens EF3B070 - 70A 3 Pole Molded Case Circuit Breaker
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Description
Built for commercial and industrial power distribution, the Siemens EF3B070 delivers robust long-time and instantaneous trip functions. This 70A, 3-pole device belongs to the legacy E-frame family of molded case circuit breakers. It mounts into older Siemens and I-T-E panelboards or switchboards requiring a bolt-on connection. While this specific unit is a legacy model, it is commonly replaced by the newer ED63B070 frame. Featuring a non-interchangeable trip unit, it handles 18kAIC at 240V.Specifications
| Brand | Siemens |
|---|---|
| Part Number | EF3B070-R |
| Series | EF |
| Amperage | 70A |
| 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, 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, Alarm Switch, Undervoltage Release |
|---|---|
| Accessories | Lugs |
| Standards | NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Non-Interchangeable Trip |
Product FAQs
6 answersWhich panelboards are compatible with the Siemens EF3B070?
This legacy E-frame breaker is designed to fit older Siemens and I-T-E panelboards and switchboards that require a 3-pole bolt-on mounting configuration.
What is the modern replacement for the legacy EF3B070 circuit breaker?
The EF3B070 is a legacy E-frame model. When upgrading or replacing this unit, it is commonly substituted with the newer ED-frame equivalent, catalog number ED63B070.
What wire gauges and materials are supported by the EF3B070 load lugs?
The load side lugs accept 14 to 1/0 AWG copper (Cu) conductors or 12 to 1/0 AWG aluminum (Al) conductors.
What type of overcurrent protection does the EF3B070 provide?
It utilizes a fixed thermal-magnetic trip unit with long-time and instantaneous (LI) functions, providing reliable protection against both sustained overloads and sudden short-circuit faults.
Can the EF3B070 be installed in direct current (DC) applications?
Yes, while primarily used in AC systems up to 600VAC, this thermal-magnetic breaker is also rated for DC power distribution up to 250VDC with a 10kA interrupting capacity.
Can the trip settings on the EF3B070 be adjusted in the field?
No, this breaker features fixed thermal and fixed magnetic settings. The trip curve is factory set and cannot be adjusted.
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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.