Siemens JXD63M300 Molded Case Circuit Breaker
- 300A
- 3 Pole
- Unit Mount
Siemens
JXD63M300
Molded Case Circuit Breaker
Brand
Siemens
SKU
JXD63M300
Quantity
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Siemens JXD63M300 - 300A 3 Pole Molded Case Circuit Breaker
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Description
Built for demanding industrial applications, the Siemens JXD63M300 is a 3-pole, 300A molded case circuit breaker from the Sentron JD Frame family. It delivers reliable long-time and instantaneous (LI) overcurrent protection. This unit-mount breaker installs into Siemens Sentron panelboards and switchboards. The "JXD" prefix indicates a factory-assembled frame with a non-interchangeable trip unit. Rated for 35kAIC at 480VAC, this breaker is specifically calibrated for 50°C environments.Specifications
| Brand | Siemens |
|---|---|
| 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, 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, Alarm Switch, Undervoltage Release, Padlock Attachment |
|---|---|
| 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
4 answersWhich Siemens panelboards are compatible with the JXD63M300 circuit breaker?
This JD frame breaker is designed for use in Siemens Sentron P4, P5, S4, and S5 panelboards, as well as compatible switchboards and motor control centers.
How is the JXD63M300 mounted within an enclosure?
It utilizes a unit mount, bolt-on connection for a secure, hardwired installation in commercial and industrial distribution equipment.
How does the trip unit on the JXD63M300 operate?
It features a thermal-magnetic trip unit with fixed thermal protection for long-time overloads and an adjustable magnetic dial for instantaneous short-circuit protection.
What does the LI trip function code on the JXD63M300 indicate?
The LI designation means the breaker provides Long-Time (L) and Instantaneous (I) protection. The long-time function protects against sustained overloads, while the instantaneous function provides immediate response to severe short-circuit events.
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