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Siemens JXD63B300 Molded Case Circuit Breaker
- 300A
- 3 Pole
- Unit Mount
Siemens
JXD63B300
Molded Case Circuit Breaker
Brand
Siemens
SKU
JXD63B300
Quantity
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Siemens JXD63B300 - 300A 3 Pole Molded Case Circuit Breaker
New
Quantity
Quantity
Siemens JXD63B300 - 300A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Siemens |
|---|---|
| Part Number | JXD63B300 |
| Series | JXD6 |
| Amperage | 300A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 500VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 25kA @ 600VAC, 25kA @ 500VDC |
| Frame Type | JXD |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Sentron Panelboards (P4, P5, S4, S5), Switchboards, Enclosures |
| 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, Lug Kit |
|---|---|
| Accessories | Lugs Not Included |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Non-Interchangeable Trip |
Quantity
Siemens JXD63B300 - 300A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Siemens |
|---|---|
| Part Number | JXD63B300-R |
| Series | JXD6 |
| Amperage | 300A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 500VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 25kA @ 600VAC, 25kA @ 500VDC |
| Frame Type | JXD |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Sentron Panelboards (P4, P5, S4, S5), Switchboards, Enclosures |
| 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, Lug Kit |
|---|---|
| Accessories | Lugs Not Included |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Non-Interchangeable Trip |
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Description
Built for commercial applications, the Siemens JXD63B300 is a 3-pole, 300A molded case circuit breaker delivering essential long-time and instantaneous (LI) protection. This unit-mount MCCB is designed for Siemens Sentron panelboards (P4, P5, S4, S5) and switchboards. Operating within the JD frame family, it provides a reliable replacement option. Rated 35kAIC at 480V, it utilizes a fixed thermal and adjustable magnetic trip unit. It is HACR rated and reverse feed capable. Lugs are not included.Specifications
| Brand | Siemens |
|---|---|
| Part Number | JXD63B300 |
| Series | JXD6 |
| Amperage | 300A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 500VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 25kA @ 600VAC, 25kA @ 500VDC |
| Frame Type | JXD |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Sentron Panelboards (P4, P5, S4, S5), Switchboards, Enclosures |
| 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, Lug Kit |
|---|---|
| Accessories | Lugs Not Included |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Non-Interchangeable Trip |
Product FAQs
7 answersWhat is the difference between the Siemens JD63B300 and JXD63B300 circuit breakers?
The primary difference is the trip unit design. The JXD63B300 is factory-assembled with a non-interchangeable thermal-magnetic trip unit. The JD63B300 features an interchangeable trip unit, allowing it to be swapped if the application requires a different trip rating without replacing the entire breaker frame.
Does the Siemens JXD63B300 come with lugs installed?
No, standard JXD63B300 breakers do not include mechanical lugs. You must purchase the appropriate lug kits separately. The standard line and load lug kit for this frame is the TA2J6500, which accepts 3/0 AWG to 500 kcmil copper or 4/0 AWG to 500 kcmil aluminum wire.
What is the magnetic trip adjustment range for this 300A breaker?
The JXD63B300 features a fixed thermal rating of 300A and an adjustable magnetic trip unit. The instantaneous magnetic trip can be adjusted between 1250A and 2500A to coordinate with system inrush currents.
Which Siemens panelboards can accommodate the JXD63B300?
This unit-mount, bolt-on breaker is designed for use in Siemens Sentron P4, P5, S4, and S5 panelboards. It is also compatible with Sentron switchboards and standalone enclosures built for JD-frame molded case circuit breakers.
Is the Siemens JXD63B300 suitable for reverse feeding?
Yes, because the JXD63B300 is a standard thermal-magnetic molded case circuit breaker without printed Line and Load restrictions, it is UL listed for reverse feed applications.
Can the JXD63B300 be used on direct current (DC) systems?
Yes, the JXD63B300 is rated for DC applications up to 500VDC with a 25kAIC interrupting rating. When installing on 250VDC or 500VDC systems, specific multi-pole series wiring configurations are required per Siemens DC application guidelines.
Is the JXD63B300 standard rated at 80% or 100% for continuous loads?
The standard JXD63B300 is rated for continuous operation at 80% of its 300A nameplate capacity. If your application requires a 100% continuous rating, you must use the JXD63B300H variant along with 90-degree C rated copper conductors.
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