Siemens REF3B070 EF3B070 - 70A 3 Pole Molded Case Circuit Breaker
- 70A
- 3 Pole
- Bolt-On
Siemens
REF3B070
EF3B070 - 70A 3 Pole Molded Case Circuit Breaker
Brand
Siemens
SKU
REF3B070
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Siemens EF3B070 - 70A 3 Pole Molded Case Circuit Breaker
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Description
Part of the legacy EF series, the Siemens REF3B070 delivers 70A of thermal-magnetic protection for commercial and industrial facilities. It secures aging infrastructure against overcurrents and short circuits. This 3-pole breaker bolts securely into older Siemens or I-T-E panelboards and switchboards. When upgrading, the ED63B070 serves as the modern replacement. It handles up to 14 kAIC at 480VAC and accepts 14-1/0 AWG copper wiring.Specifications
| Brand | Siemens |
|---|---|
| Part Number | REF3B070-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 / ITE 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 | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Non-Interchangeable Trip |
Product FAQs
6 answersIs the Siemens EF3B070 a current production model?
The EF3B070 is a legacy E-frame circuit breaker originally produced by ITE and Siemens. When replacing this unit, the newer ED-frame series, such as the ED63B070, is commonly used as a modern equivalent for 600V applications.
What panels accept the EF3B070 circuit breaker?
This breaker is compatible with legacy Siemens and ITE panelboards and switchboards designed to accept E-frame bolt-on breakers. It is not compatible with standard plug-on load centers.
Does this breaker mount to a standard DIN rail?
No, the EF3B070 is a bolt-on molded case circuit breaker. It must be bolted directly to the busbars inside a compatible industrial panelboard or switchboard.
Can the EF3B070 be utilized in DC electrical systems?
Yes, the thermal-magnetic trip unit is rated for direct current applications up to 250VDC, allowing it to be used in industrial DC control panels or battery systems.
Do I need to purchase separate lugs for the load side?
No, the breaker includes factory-installed load-side mechanical lugs. These terminals are dual-rated for both copper and aluminum conductors.
Can the trip settings on the EF3B070 be adjusted in the field?
No, this breaker features a fixed thermal and fixed magnetic trip unit. The long-time and instantaneous trip functions are factory calibrated and cannot be modified by the user.
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