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Siemens JXD63M400 Molded Case Circuit Breaker
- 400A
- 3 Pole
- Unit Mount
Siemens
JXD63M400
Molded Case Circuit Breaker
Brand
Siemens
SKU
JXD63M400
Quantity
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Siemens JXD63M400 - 400A 3 Pole Molded Case Circuit Breaker
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Description
Designed for high-capacity industrial applications, the Siemens JXD63M400 is a 3-pole, 400A molded case circuit breaker. It delivers robust long-time and instantaneous (LI) protection for heavy motor loads. This unit-mount breaker integrates into Siemens motor control centers and switchboards. It serves as the 50°C calibrated counterpart to the standard 40°C JXD63B400. Operating with a 35kAIC rating at 480VAC, this JD Frame breaker features an adjustable magnetic setting.Specifications
| Brand | Siemens |
|---|---|
| Part Number | JXD63M400 |
| 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 |
| Frame Type | JXD |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Motor Control Centers, 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, Lug Kit |
|---|---|
| Accessories | Lugs Not Included |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, IEC, UL |
| Temp Rating | 50C |
| Construction Features | HACR Rated, Reverse Feed, Non-Interchangeable Trip, 50C Ambient Calibration |
Product FAQs
8 answersWhat is the difference between the JXD63M400 and the standard JXD63B400?
The JXD63M400 is a specialized 50-degree Celsius ambient calibrated version, commonly required in high-heat industrial environments or specific motor control applications. The standard JXD63B400 is calibrated for a normal 40-degree Celsius environment.
Which wire lug kit is compatible with this 400A breaker?
For a standard 400A installation, use the Siemens TA2J6500 line and load lug kit. This is a two-barrel aluminum body lug that accepts two conductors per phase, supporting 3/0 AWG to 500 kcmil copper or 4/0 AWG to 500 kcmil aluminum wire.
Can I field-install accessories like a shunt trip or auxiliary switch on the JXD63M400?
Yes, the Sentron JD frame supports field-installable internal accessories. The 3-pole frame includes two accessory pockets to accommodate devices like shunt trips, auxiliary switches, and undervoltage releases.
Which standalone enclosures are approved for use with this breaker?
To mount this breaker directly to a wall or surface, you can use the Siemens J6N1 enclosure for indoor NEMA 1 applications, or the J6N3R enclosure for outdoor and weatherproof NEMA 3R environments.
Is the trip unit on the JXD63M400 interchangeable?
No, the JXD6 series is built with a factory-sealed, non-interchangeable thermal-magnetic trip unit. If your application requires an interchangeable trip unit, you will need to specify the standard JD6 frame instead.
How does the adjustable magnetic trip function operate on this breaker?
While the thermal overload setting is fixed at 400A, the magnetic short-circuit pickup is adjustable. This allows panel builders to fine-tune the instantaneous trip response to coordinate with downstream devices and prevent nuisance tripping during high motor inrush currents.
Is this breaker approved for use on direct current systems?
Yes, the JXD63M400 is safely rated for use on direct current systems up to 500VDC, providing a 25kAIC interrupting rating at this voltage level.
Is the JXD63M400 circuit breaker HACR rated?
Yes, this breaker is HACR rated, meaning it has passed specific testing to safely provide overcurrent protection for heating, air conditioning, and refrigeration equipment group loads.
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