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Siemens / ITE JJ3B250 Molded Case Circuit Breaker
- 250A
- 3 Pole
- Bolt-On
Siemens / ITE
JJ3B250
Molded Case Circuit Breaker
Brand
Siemens / ITE
SKU
JJ3B250
Quantity
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Siemens / ITE JJ3B250 - 250A 3 Pole Molded Case Circuit Breaker
Re-Certified
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Description
Designed to maintain existing infrastructure, the Siemens JJ3B250 is a 250A, 3-pole molded case circuit breaker. It delivers robust protection for commercial applications operating up to 600VAC. This legacy breaker installs into Siemens P4 and P5 panelboards, plus SB switchboards. It provides a seamless hardware match for older enclosures, bypassing the need for modern adapters. Delivering a 25kAIC rating at 480V, the unit utilizes standard lug terminals accepting up to 500 kcmil wire.Specifications
| Brand | Siemens / ITE |
|---|---|
| Part Number | JJ3B250 |
| Series | JJ |
| Amperage | 250A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 25kA @ 480VAC, 18kA @ 600VAC, 20kA @ 250VDC |
| Frame Type | JJ |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P4, P5 Panelboards, SB Switchboards, FC/FCI/FCII Distribution Interiors |
| 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 |
|---|---|
| Accessories | Lugs |
| Standards | NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Non-Interchangeable Trip |
Product FAQs
6 answersWhich panelboards and switchboards are compatible with the JJ3B250?
This J-frame breaker is designed for installation in Siemens P4 and P5 panelboards, SB switchboards, and FC, FCI, or FCII distribution interiors.
What wire sizes are accepted by the standard lugs on this breaker?
The included lugs accommodate aluminum or copper conductors ranging from 3/0 AWG to 500 kcmil. Always verify the required torque specifications printed on the breaker faceplate before terminating.
How does the trip unit operate on the JJ3B250?
It features a thermal-magnetic trip unit with a fixed thermal element for long-time overload protection and an adjustable magnetic element. The adjustable instantaneous setting allows electricians to fine-tune short-circuit protection to prevent nuisance tripping from motor inrush currents.
Can this molded case circuit breaker be applied in DC electrical systems?
Yes, in addition to its AC ratings, this breaker is rated for 250VDC applications and provides a 20kA interrupting capacity for direct current circuits.
Are additional mounting kits required to install this breaker?
Because it is a bolt-on device, it connects directly to the busbars of supported Siemens and ITE enclosures. However, depending on the specific panelboard or switchboard chassis, a separate strap kit or mounting hardware assembly may be necessary for proper installation.
Is this unit a direct replacement for legacy ITE JJ-frame breakers?
Yes, it shares the exact physical footprint and bolt-on configuration as older ITE JJ-frame models, making it a direct drop-in replacement for existing installations.
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