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Siemens JXD63B400L Molded Case Circuit Breaker
- 400A
- 3 Pole
- Unit Mount
Siemens
JXD63B400L
Molded Case Circuit Breaker
Brand
Siemens
SKU
JXD63B400L
Quantity
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Siemens JXD63B400L - 400A 3 Pole Molded Case Circuit Breaker
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Description
Designed for robust industrial power distribution, this 400-amp JD-frame breaker comes complete with factory-installed TA2J6500 lugs accepting 3/0 AWG to 500 kcmil wire. The unit mounts into Siemens Sentron P4, P5, S4, and S5 panelboards, as well as compatible switchboards and motor control centers. While this specific Sentron series is transitioning to the newer 3VA platform, it remains fully supported for existing infrastructure, offering 35kAIC at 480V and adjustable magnetic trip settings.Specifications
| Brand | Siemens |
|---|---|
| Part Number | JXD63B400L |
| Series | JXD6 |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 500VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 25kA @ 600VAC, 25kA @ 500VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Siemens Sentron Panelboards (Type P4, P5, S4, S5), Switchboards, Motor Control Centers |
| Wire Gauge | 3/0 AWG - 500 kcmil (Cu/Al) |
| 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 |
|---|---|
| Accessories | Line and Load Lugs (TA2J6500) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, UL 489 |
| Approval | CE, CSA, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Non-Interchangeable Trip |
Product FAQs
6 answersWhat is the difference between the Siemens JXD63B400 and the JXD63B400L?
The base JXD63B400 includes the breaker frame and trip unit but requires you to source and install the wire terminals separately. The JXD63B400L arrives fully assembled with the necessary line and load lugs pre-installed at the factory.
Which replacement lug kit fits the factory terminals on the JXD63B400L?
The standard mechanical lug kit used on this 400A JD Frame breaker is part number TA2J6500. Each lug is rated to accept a single copper or aluminum conductor ranging from 3/0 AWG to 500 kcmil.
Which Siemens panelboards can accommodate the JXD63B400L circuit breaker?
This JD Frame breaker is designed for unit-mount installations in Siemens Sentron Type P4, P5, S4, and S5 panelboards. It is also suitable for use in compatible Siemens switchboards and motor control centers.
How is a unit-mount breaker like the JXD63B400L installed?
Unit-mount breakers bolt directly to the mounting pan or bracket structure inside the electrical enclosure. Unlike plug-in or bolt-on branch breakers, they do not mount directly to the energized busbars, relying on cabled connections to the lugs instead.
How does the LI trip unit in this breaker operate?
The Long-Time and Instantaneous (LI) thermal-magnetic trip unit provides dual-level protection. The fixed thermal mechanism protects against gradual overheating from sustained overloads, while the adjustable magnetic mechanism allows you to set the specific threshold for clearing severe short circuits instantly.
Does the JXD63B400L feature advanced solid-state trip adjustments?
No, the JXD6 series utilizes a standard thermal-magnetic trip unit. If your installation requires electronic trip functions, such as ground fault sensing or short-time delay, you must step up to the SJD6 frame which features the Sensitrip III solid-state trip unit.
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