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Siemens HJXD63B300L Molded Case Circuit Breaker
- 300A
- 3 Pole
- Unit Mount
Siemens
HJXD63B300L
Molded Case Circuit Breaker
Brand
Siemens
SKU
HJXD63B300L
Quantity
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Siemens HJXD63B300L - 300A 3 Pole Molded Case Circuit Breaker
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Description
Part of the Sentron family, this 300A unit mount breaker is built for standalone enclosures and switchboard applications. The "L" suffix indicates that it comes equipped with TA2J6500 line and load lugs, accommodating 3/0 AWG to 500 kcmil wire. Installation is streamlined for Siemens S4, S5, and SPP panelboards where unit mounting is required. The robust JD frame construction ensures durability in demanding industrial environments.Specifications
| Brand | Siemens |
|---|---|
| Part Number | HJXD63B300L |
| Series | HJXD6 |
| Amperage | 300A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 500VDC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 35kA @ 600VAC, 25kA @ 500VDC |
| Frame Type | JD |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Sentron Panelboards (Type P4, P5, S4, S5, SPP), Switchboards, Enclosures |
| Wire Gauge | (2) 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, Padlock Attachment |
|---|---|
| Accessories | Line and Load Lugs (TA2J6500) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB-1, UL 489 |
| Approval | CSA, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, Reverse Feed, Non-Interchangeable Trip, Trip-Free Mechanism |
Product FAQs
9 answersWhich Siemens panelboards are compatible with the HJXD63B300L?
This JD Frame breaker is designed for use in Siemens Sentron panelboards, specifically types P4, P5, S4, S5, and SPP. It is also compatible with Siemens switchboards and standalone enclosures designed for unit mount breakers.
What is the difference between the Siemens HJXD63B300 and HJXD63B300L?
The L suffix indicates that the breaker comes factory-equipped with line and load lugs, typically part number TA2J6500. The base HJXD63B300 catalog number does not include lugs, requiring them to be sourced and installed separately.
What wire sizes are accepted by the factory lugs on the HJXD63B300L?
The included lugs accept two conductors per phase, accommodating wire sizes from 3/0 AWG up to 500 kcmil. Always ensure the wire is rated for the appropriate temperature and torqued to the specifications printed on the breaker faceplate.
How does the adjustable magnetic trip function benefit the installation?
While the thermal overload trip is fixed at 300 amps, the magnetic instantaneous trip is adjustable. This allows panel builders and electricians to fine-tune the short circuit response, ensuring proper selective coordination with downstream breakers and preventing nuisance tripping.
What protection does the LI trip function provide on the HJXD63B300L?
The LI designation stands for Long-Time and Instantaneous protection. The Long-Time function guards against sustained overloads, while the Instantaneous function provides immediate tripping during a severe short circuit to protect equipment from thermal and magnetic stress.
How is the HJXD63B300L mounted in an electrical enclosure?
This is a unit mount, feed-thru circuit breaker. It bolts directly to the panel backpan or enclosure mounting plate rather than plugging into a busbar, which is standard for JD Frame breakers in heavy industrial applications.
Can the HJXD63B300L be used in DC electrical systems?
Yes, this breaker is rated for both AC and DC applications. It supports up to 500VDC with an interrupting capacity of 25kAIC, making it suitable for specific industrial DC distribution or UPS systems.
What are the AC interrupting ratings for the HJXD63B300L?
The breaker features a high interrupting capacity, rated at 100kAIC at 240VAC, 65kAIC at 480VAC, and 35kAIC at 600VAC. These ratings determine the maximum fault current the breaker can safely clear at a given voltage.
What frame size is the HJXD63B300L?
This breaker utilizes the Siemens JD Frame. Knowing the frame size is critical when selecting mounting hardware, handle ties, or external accessories for Sentron series panelboards and switchboards.
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