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Siemens / ITE HJ3B350 Molded Case Circuit Breaker
- 350A
- 3 Pole
- Bolt-On
Siemens / ITE
HJ3B350
Molded Case Circuit Breaker
Brand
Siemens / ITE
SKU
HJ3B350
Quantity
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Siemens / ITE HJ3B350 - 350A 3 Pole Molded Case Circuit Breaker
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Description
Engineered for heavy-duty commercial use, this 350-amp, 3-pole MCCB provides dependable long-time and instantaneous (LI) trip functions. The unit operates at up to 600VAC and 500VDC. Designed as a drop-in solution for aging infrastructure, it mounts into Siemens and ITE P4 or P5 panelboards. Using this exact replacement avoids the cost of upgrading entire enclosures. With a robust 65 kAIC rating at 480VAC, it handles significant fault currents safely while offering an interchangeable trip unit.Specifications
| Brand | Siemens / ITE |
|---|---|
| Part Number | HJ3B350-R |
| Series | HJ |
| Amperage | 350A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC, 500VDC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC, 30kA @ 500VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Siemens P4, P5 Panelboards, Switchboards |
| 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, Padlock Attachment |
|---|---|
| Accessories | Lugs not included |
| Standards | CSA C22.2 No. 5, UL 489, NEMA AB-1 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, Interchangeable Trip Unit, Trip-Free Mechanism |
Product FAQs
8 answersWhich panelboards accept the Siemens HJ3B350 circuit breaker?
This breaker is engineered to bolt directly into Siemens P4 and P5 panelboards, as well as compatible Siemens switchboards. Using this exact replacement allows facilities to maintain their existing enclosures without the cost of a full system upgrade.
How is the HJ3B350 secured inside the panelboard?
This is a bolt-on molded case circuit breaker. It must be mechanically bolted directly to the busbars of a compatible Siemens P4 or P5 panelboard or switchboard, providing a secure and reliable connection for high-amperage commercial loads.
What are the conductor requirements for wiring the HJ3B350?
The breaker includes lug terminals that accommodate either copper or aluminum wiring. Installers must use conductors sized between 3/0 AWG and 500 kcmil, ensuring proper torque is applied to maintain a secure, low-resistance connection.
What does the adjustable magnetic trip on the HJ3B350 allow me to do?
While the thermal overload protection is fixed at 350 amps, the adjustable magnetic trip function allows licensed electricians to dial in the instantaneous short-circuit response threshold. This is critical for coordinating with downstream breakers and preventing nuisance tripping from high inrush currents.
Are ITE HJ3B350 and Siemens HJ3B350 the exact same breaker?
Yes. Following Siemens acquiring ITE, legacy breakers like the HJ series were manufactured under both brand names. An ITE-branded HJ3B350 and a Siemens-branded HJ3B350 share the exact same physical dimensions, mounting hardware, and electrical ratings.
Can the trip unit on the HJ3B350 be swapped out?
Yes, this model features an interchangeable trip unit design. If a facility's amperage requirements change, a qualified technician can replace the trip unit portion without having to unbolt the entire breaker frame from the panelboard.
Is the HJ3B350 suitable for high-fault commercial environments?
Yes, it is built for heavy-duty applications and features a high interrupting capacity, including a 65kA rating at 480VAC and 100kA at 240VAC. This ensures it can safely clear severe fault currents in large commercial or industrial distribution systems.
Can the Siemens HJ3B350 be used in DC power systems?
Yes, in addition to standard AC systems, this breaker is rated for up to 500VDC with a 30kA interrupting capacity. When installing in DC applications, verify that your panel and load requirements align with these specific DC ratings.
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