Siemens F3B070 Molded Case Circuit Breaker
- 70A
- 3 Pole
- Bolt-On
Quantity
Siemens F3B070 - 70A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Operating at up to 600VAC, this 70-amp three-pole molded case breaker delivers essential thermal-magnetic protection. It is a core component for industrial facilities utilizing legacy Siemens distribution equipment. Installation is straightforward as it mounts into standard Siemens F-Frame enclosures and switchboards. When transitioning to current hardware, the FD63B070 serves as the designated replacement. This non-interchangeable trip breaker provides a 14kA short circuit rating at 480VAC.Specifications
| Brand | Siemens |
|---|---|
| Part Number | F3B070 |
| Series | F3B |
| Amperage | 70A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 14kA @ 480VAC, 14kA @ 600VAC, 10kA @ 250VDC |
| Frame Type | F |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens F-Frame Panelboards, Switchboards, Enclosures |
| Wire Gauge | 14-1/0 AWG (Cu/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 | Line and Load Lugs Included |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Non-Interchangeable Trip |
Product FAQs
7 answersWhat panelboards are compatible with the Siemens F3B070?
The F3B070 is designed for Siemens F-frame panelboards, switchboards, and enclosures. It is a bolt-on commercial and industrial breaker and is not compatible with plug-on residential load centers.
What mounting hardware is required to install the F3B070?
Installing this breaker in a Siemens panelboard or switchboard typically requires F-frame mounting hardware, such as the SIE6F62 strap kit, to secure the bolt-on connections to the bus bar.
Is the Siemens F3B070 still an active product line?
The F3B070 is a legacy F-frame breaker. For modern replacements, Siemens often transitions users to the FD6 frame, such as the FD63B070, or the newer 3VA series, depending on the specific enclosure and UL listing requirements.
Can the F3B070 be used in DC applications?
Yes, this thermal-magnetic breaker carries a DC rating of 250VDC with an interrupting capacity of 10kA, making it suitable for specific industrial DC control or distribution circuits.
What wire sizes are accepted by the F3B070 lugs?
The standard lugs on this breaker accept 14 AWG to 1/0 AWG copper or aluminum wire. Ensure connections are torqued to the manufacturer specifications printed on the breaker label.
Can I install this breaker in a Square D or Eaton panel?
No. The F3B070 is strictly UL-listed for Siemens enclosures. Installing it in another manufacturer's panelboard violates electrical code and creates a severe safety and fire hazard.
Why is it important to verify the AIC rating before installing the F3B070?
The F3B070 has a 25kAIC rating at 240VAC and 14kAIC at 480VAC. Installing a breaker with a lower interrupting capacity than the panel's available fault current can result in catastrophic failure and arc flash hazards during a short circuit.
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