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Siemens / ITE JJ3B350 Molded Case Circuit Breaker
- 350A
- 3 Pole
- Bolt-On
Siemens / ITE
JJ3B350
Molded Case Circuit Breaker
Brand
Siemens / ITE
SKU
JJ3B350
Quantity
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Siemens / ITE JJ3B350 - 350A 3 Pole Molded Case Circuit Breaker
Re-Certified
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Description
Built to handle demanding industrial loads, the Siemens JJ3B350 is a 350-amp, 3-pole molded case circuit breaker. Utilizing proven thermal-magnetic trip technology, it safeguards 600VAC and 250VDC electrical distribution systems against damaging overcurrents and short circuits. This bolt-on unit is engineered to fit legacy Siemens P4 and P5 panelboards, as well as SB switchboards.Specifications
| Brand | Siemens / ITE |
|---|---|
| Series | JJ |
| Amperage | 350A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 25kA @ 480VAC, 18kA @ 600VAC, 20kA @ 250VDC |
| Frame Type | JJ |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P4, P5 Panelboards, SB Switchboards, FC/FCI/FCII Distribution Interiors |
| Wire Gauge | 3/0 AWG - 500 kcmil (Al/Cu) |
| Max Wire | 500 kcmil |
| Min Wire | 3/0 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Lugs |
| Standards | NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Non-Interchangeable Trip |
Product FAQs
6 answersWhat enclosures accept the JJ3B350 circuit breaker?
This J-frame breaker mounts directly into Siemens P4 and P5 panelboards, SB switchboards, and legacy FC, FCI, and FCII distribution interiors. Because it shares the original ITE footprint, it bolts in without requiring custom retrofit hardware.
Is the Siemens JJ3B350 a direct replacement for older ITE models?
Yes. Siemens maintained the original ITE design for this legacy MCCB. The JJ3B350 is an exact drop-in replacement for older ITE breakers sharing the same catalog number, ensuring seamless integration into existing infrastructure.
What is the purpose of the adjustable magnetic trip on the JJ3B350?
The adjustable magnetic trip allows electricians to set the instantaneous short-circuit pickup threshold. This adjustability helps coordinate the breaker with downstream devices and prevents nuisance tripping caused by high inrush currents from large motors or transformers.
What protection does the LI trip function provide?
The LI code stands for Long-Time and Instantaneous protection. The Long-Time thermal element prevents damage from sustained overloads, while the Instantaneous magnetic element clears high-level short circuits immediately to protect the electrical system.
What type of wire can be used with the standard lugs on this breaker?
The included mechanical lugs are dual-rated for both aluminum and copper conductors ranging from 3/0 AWG to 500 kcmil. Always verify the specific torque values printed on the breaker label before terminating the conductors.
Can the JJ3B350 be installed in DC applications?
Yes, in addition to its 600VAC rating, this breaker is certified for 250VDC systems. It provides a 20kAIC interrupting rating at 250VDC, making it suitable for industrial DC distribution and control circuits.
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