Siemens JXD63M250 Molded Case Circuit Breaker
- 250A
- 3 Pole
- Unit Mount
Siemens
JXD63M250
Molded Case Circuit Breaker
Brand
Siemens
SKU
JXD63M250
Quantity
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Siemens JXD63M250 - 250A 3 Pole Molded Case Circuit Breaker
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Description
Built to withstand elevated operating temperatures, this 250-amp unit mount breaker features a specialized 50°C ambient calibration for demanding industrial facilities. It integrates into Siemens Sentron panelboards, switchboards, and motor control centers, utilizing the proven JD-frame footprint.Specifications
| Brand | Siemens |
|---|---|
| Series | JXD6 |
| Amperage | 250A |
| 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, Switchboards, Motor Control Centers |
| 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 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
7 answersWhat does the 'M' in the JXD63M250 catalog number signify?
The 'M' indicates that this breaker is specially calibrated for 50 degrees C (122 degrees F) high-ambient temperature environments, unlike standard 40 degrees C breakers.
Are lugs included with the Siemens JXD63M250?
No, this JD-frame circuit breaker is supplied without lugs installed. Compatible lug kits, such as the TA2J6500 which accepts 3/0 AWG to 500 kcmil wire, must be sourced separately.
Can I install the JXD63M250 in standard Siemens load centers?
No, this JD-frame breaker is designed for commercial and industrial applications. It is compatible with Siemens Sentron panelboards, switchboards, and motor control centers, rather than residential load centers.
How does the trip unit operate on the JXD63M250?
It features a thermal-magnetic trip unit with fixed thermal protection for long-time overcurrents and an adjustable magnetic dial for instantaneous short-circuit protection. This allows for precise coordination in commercial systems.
What is the difference between the JXD63M250 and the JXD63B250?
Both are 250A, 3-pole JD-frame breakers, but the JXD63M250 is calibrated for 50 degrees C high-ambient environments. The JXD63B250 is the standard 40 degrees C calibrated version.
Why would an application require a 50 degrees C calibrated breaker like the JXD63M250?
A 50 degrees C calibrated breaker prevents nuisance tripping in environments with consistently high ambient temperatures, such as industrial facilities, boiler rooms, or outdoor enclosures exposed to direct sunlight.
Can the JXD63M250 be used in DC applications?
Yes, in addition to its AC ratings, this breaker carries a DC voltage rating and a 25kAIC interrupting rating for DC systems, making it suitable for specific industrial DC power applications.
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