Siemens HJXD62B300 Molded Case Circuit Breaker
- 300A
- 2 Pole
- Bolt-On
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Siemens HJXD62B300 - 300A 2 Pole Molded Case Circuit Breaker
New
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Description
Belonging to the Siemens Sentron family, the HJXD62B300 MCCB handles commercial power distribution. This 300A, 2-pole device provides reliable thermal-magnetic (LI) protection. Featuring a JD-frame footprint, it utilizes a bolt-on mounting style. The breaker installs into Siemens P4 and P5 panelboards and switchboards. Rated for 65 kAIC at 480VAC, it safely clears severe fault currents. It includes an adjustable magnetic trip, reverse feed capability, and requires separate lugs.Specifications
| Brand | Siemens |
|---|---|
| Series | HJXD6 |
| Amperage | 300A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 1 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 35kA @ 600VAC, 30kA @ 250VDC |
| Frame Type | JD |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P4, P5 Panelboards, Switchboards |
| 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, Mechanical Lugs, Compression Lugs |
|---|---|
| Accessories | Lugs Not Included |
| 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, Reverse Feed, High Interrupting Capacity, Non-Interchangeable Trip, 2-Pole in 3-Pole Housing |
Product FAQs
8 answersWhat is the difference between the Siemens JXD62B300 and the HJXD62B300?
The HJXD62B300 is the high-interrupting capacity version of the standard JXD62B300. While both are 300A, 2-pole JD-frame breakers, the HJXD62B300 provides a higher interrupting rating of 65kAIC at 480VAC, compared to the standard 35kAIC rating of the JXD62B300.
Does the HJXD62B300 come with line and load lugs included?
Standard HJXD62B300 catalog numbers typically include the frame and trip unit but do not include lugs unless ordered with an L suffix, such as HJXD62B300L. If you need to order lugs separately, compatible options include the TA2J6500 aluminum lug kit or the TC2J6500 copper lug kit.
What wire sizes are compatible with the standard lug kits for this JD-frame breaker?
When using the TA2J6500 aluminum lug kit, the breaker accepts 3/0 AWG to 500 kcmil copper or 4/0 AWG to 500 kcmil aluminum wire. The TC2J6500 copper lug kit accepts 3/0 AWG to 500 kcmil copper wire only.
What is the instantaneous magnetic trip adjustment range for the 300A HJXD62B300?
The adjustable magnetic trip on this 300A breaker can be set between a low of 1250A and a high of 2500A. The thermal overload protection remains fixed at 300A.
Which Siemens panelboards are designed to accept the HJXD62B300 circuit breaker?
This bolt-on JD-frame breaker is engineered for installation in Siemens P4 and P5 panelboards, as well as compatible Siemens switchboards.
Can the HJXD62B300 be used in DC power systems?
Yes, this breaker is rated for use in DC applications up to 250VDC, where it provides an interrupting rating of 30kAIC.
Is the HJXD62B300 suitable for reverse feed applications?
Yes, Siemens JD-frame breakers, including the HJXD62B300, are UL listed for reverse feed applications, allowing line power to be connected to either the top or bottom terminals.
Can the trip unit on the HJXD62B300 be swapped or upgraded?
No, the HJXD62B300 features a non-interchangeable thermal magnetic trip unit. The trip unit is factory installed and cannot be removed or swapped for a different amperage or electronic trip unit in the field.
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