Siemens JJ63B250 Molded Case Circuit Breaker
- 250A
- 3 Pole
- Bolt-On
Quantity
Siemens JJ63B250 - 250A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Designed for heavy-duty distribution, the Siemens JJ63B250 is a 250A MCCB from the classic J-frame family. It utilizes a thermal-magnetic trip mechanism to provide essential LI protection. Equipped with bolt-on mounting, this three-pole unit installs into Siemens P4 and P5 panelboards. It includes lugs for aluminum or copper wiring. The JXD63B250 serves as its modern replacement. Capable of handling 65kAIC at 240V and 25kAIC at 480V, this breaker complies with UL 489 standards.Specifications
| Brand | Siemens |
|---|---|
| Part Number | JJ63B250 |
| Series | JJ |
| Amperage | 250A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 25kA @ 480VAC, 10kA @ 600VAC, 25kA @ 250VDC |
| Frame Type | JJ63 |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P4, P5 Panelboards, Switchboards |
| Wire Gauge | 3/0 AWG - 500 kcmil (Al/Cu) |
| 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, Padlock Attachment |
|---|---|
| Accessories | Line and Load Lugs Included |
| Standards | NEMA AB-1, UL 489, CSA C22.2 No. 5 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Interchangeable Trip Unit |
Product FAQs
7 answersWhich panelboards accept the JJ63B250 circuit breaker?
This bolt-on J-frame breaker is designed for installation in Siemens P4 and P5 panelboards, as well as compatible Siemens switchboards.
Is the JJ63B250 still in active production?
The JJ63B250 is a legacy Sentron J-frame circuit breaker. For new installations or direct replacements, the modern equivalent is the Siemens JXD63B250.
What does the adjustable magnetic trip on the JJ63B250 allow you to do?
While the thermal element provides fixed overload protection, the adjustable magnetic trip allows electricians to set the instantaneous short-circuit pickup level. This helps achieve proper selective coordination with downstream devices.
Is the JJ63B250 approved for reverse feed applications?
Yes, this thermal-magnetic J-frame breaker does not have restricted line and load markings, making it suitable for reverse feed installations.
What are the wiring capabilities for the JJ63B250 lugs?
The standard lugs accommodate 3/0 AWG to 500 kcmil aluminum or copper conductors. Ensure proper torque is applied to both the wire binding screws and the bolt-on bus connections during installation.
Can the JJ63B250 be used in DC power systems?
Yes, in addition to its 600VAC rating, this breaker is rated for up to 250VDC with a 25kA interrupting capacity. This makes it suitable for industrial DC distribution and control applications.
How should the bolt-on connections be maintained for safe operation?
Bolt-on connections to the panelboard bus must be torqued to Siemens specifications during initial installation. Periodic infrared scanning or torque verification is recommended to prevent high-resistance connections and overheating.
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