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Siemens JL3B350 Molded Case Circuit Breaker
- 350A
- 3 Pole
- Bolt-On
Siemens
JL3B350
Molded Case Circuit Breaker
Brand
Siemens
SKU
JL3B350
Quantity
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Siemens JL3B350 - 350A 3 Pole Molded Case Circuit Breaker
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Description
Engineered for heavy-duty commercial applications, the Siemens JL3B350 is a 350A, 3-pole molded case circuit breaker. It features a fixed thermal and adjustable magnetic trip mechanism. This bolt-on breaker is compatible with Siemens P4 and P5 panelboards, switchboards, and motor control centers. It also fits legacy ITE FC-1 systems, and is replaced by the JD63B350 model. With an interrupting rating of 35kA at 480VAC, this HACR-rated component ensures reliable fault clearing.Specifications
| Brand | Siemens |
|---|---|
| Part Number | JL3B350-R |
| Series | JL |
| Amperage | 350A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 25kA @ 600VAC, 30kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Siemens P4, P5 Panelboards, Switchboards, Motor Control Centers, Legacy ITE FC-1 Panelboards |
| Wire Gauge | 3/0 AWG - 500 kcmil |
| 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, Lug Kits |
|---|---|
| Accessories | Lugs Not Included |
| Standards | UL 489, CSA C22.2 No. 5, NEMA AB-1 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Interchangeable Trip Unit |
Product FAQs
5 answersWhich panelboards and switchboards are compatible with the JL3B350 breaker?
This bolt-on breaker is designed for use in Siemens P4 and P5 panelboards, switchboards, and motor control centers. It is also backward compatible with legacy ITE FC-1 panelboards.
What is the modern replacement for the legacy JL3B350 circuit breaker?
The direct modern replacement for this legacy J-Frame breaker is the Siemens JD63B350.
Are terminal lugs included with this circuit breaker?
No, terminal lugs are not included with this breaker and must be sourced separately. When equipped with standard lugs, the breaker accepts wire sizes from 3/0 AWG to 500 kcmil.
How does the trip unit function on this J-Frame breaker?
It features a thermal-magnetic trip unit with a fixed thermal element for long-time overload protection and an adjustable magnetic element for instantaneous short-circuit protection. The trip unit is also interchangeable.
Is this breaker the same as the ITE JL3B350?
Yes. Siemens acquired ITE, and this breaker may be labeled under either the Siemens or ITE brand. They are the exact same physical and electrical component.
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