Siemens JXD63M350 Molded Case Circuit Breaker
- 350A
- 3 Pole
- Unit Mount
Siemens
JXD63M350
Molded Case Circuit Breaker
Brand
Siemens
SKU
JXD63M350
Quantity
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Siemens JXD63M350 - 350A 3 Pole Molded Case Circuit Breaker
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Description
The Siemens JXD63M350 is a 3-pole, 350A molded case circuit breaker designed for industrial power distribution. Part of the Sentron series, it provides dependable thermal-magnetic (LI) protection against overloads and short circuits. This bolt-on MCCB mounts into Siemens switchboards and motor control centers. It has been superseded by the newer 3VA Series for modern applications. Engineered with a non-interchangeable trip unit, the breaker is calibrated for 50°C ambient temperatures.Specifications
| Brand | Siemens |
|---|---|
| Series | JXD6 |
| Amperage | 350A |
| 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, Padlock Attachment, Lug Kits |
|---|---|
| Accessories | Lugs Not Included |
| Standards | CSA C22.2 No. 5, IEC 60947-2, UL 489, UL 489 Supplement SB |
| Approval | CE, CSA, IEC, UL |
| Temp Rating | 50C |
| Construction Features | HACR Rated, Reverse Feed, Non-Interchangeable Trip, 50C Ambient Calibration |
Product FAQs
6 answersWhat panels and enclosures are compatible with the JXD63M350?
This JD-frame breaker is designed for bolt-on installation in Siemens commercial and industrial switchboards and motor control centers that accept J-frame breakers. It is not intended for residential load centers.
What does the M in the JXD63M350 catalog number indicate?
The M in the catalog number indicates that the thermal trip unit is calibrated for a 50C ambient temperature, rather than the standard 40C calibration. This makes it suitable for high-temperature industrial environments.
How is the magnetic trip adjusted on the JXD63M350?
The JXD63M350 features a fixed thermal and adjustable magnetic trip unit. The instantaneous magnetic pickup can be adjusted using the rotary dial on the front face of the breaker, which offers a range of detents based on multiples of the 350A continuous rating.
Does the JXD63M350 come with terminal lugs installed?
No, this breaker is typically supplied without lugs. You must install compatible Siemens JD-frame lug kits, such as the TA2J6500 aluminum lug kit, depending on your specific conductor size and material.
Can the JXD63M350 replace older Siemens or I-T-E JD-frame breakers?
Yes, the JXD63M350 shares the same physical dimensions and mounting footprint as older Siemens and I-T-E JD-frame breakers, making it a direct replacement for obsolete 350A models in existing switchboards.
What is the recommended maintenance for the thermal-magnetic trip unit on this breaker?
Standard maintenance includes verifying that the adjustable magnetic dial is set correctly for the downstream load, checking terminal torque values to prevent overheating, and exercising the breaker manually to ensure the mechanical linkages operate smoothly.
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