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Siemens / ITE JJ3B275 Molded Case Circuit Breaker
- 275A
- 3 Pole
- Bolt-On
Siemens / ITE
JJ3B275
Molded Case Circuit Breaker
Brand
Siemens / ITE
SKU
JJ3B275
Quantity
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Siemens / ITE JJ3B275 - 275A 3 Pole Molded Case Circuit Breaker
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Description
Engineered to restore power in aging facilities, the Siemens JJ3B275 is a 3-pole, 275A molded case circuit breaker. It delivers reliable thermal-magnetic protection with an adjustable magnetic trip unit, rated for 25 kAIC at 480VAC. This JJ-frame breaker is an exact replacement for older Siemens and ITE infrastructure. It mounts into P4 and P5 panelboards, SB switchboards, and FC interiors. By utilizing the original bolt-on hardware, it eliminates the need for costly retrofits.Specifications
| Brand | Siemens / ITE |
|---|---|
| Part Number | JJ3B275 |
| Series | JJ |
| Amperage | 275A |
| 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
7 answersWhich Siemens panelboards and switchboards are compatible with the JJ3B275 breaker?
This bolt-on J-Frame breaker is designed for use in Siemens P4 and P5 panelboards, SB switchboards, and FC, FCI, or FCII distribution interiors.
What wire sizes are supported by the standard lugs on this breaker?
The standard terminal lugs accept aluminum or copper conductors ranging from 3/0 AWG to 500 kcmil. Always verify the specific lug catalog number installed on the breaker, as alternate lug kits may have different wire capacities.
How does the trip unit on the JJ3B275 operate?
It features a thermal-magnetic trip unit with fixed thermal protection for overloads and an adjustable magnetic setting. The adjustable magnetic dial allows electricians to tune the instantaneous short-circuit response to coordinate with downstream devices in the system.
Does this breaker include ground fault or short-time delay protection?
No. This breaker has an LI (Long-Time and Instantaneous) trip function. It does not include short-time delay or equipment ground fault protection.
Can the JJ3B275 be utilized in direct current systems?
Yes, this breaker is rated for use in DC applications up to 250VDC, providing an interrupting capacity of 20kA at that voltage. Verify your specific DC system grounding and wiring configuration before installation.
Is the JJ3B275 part of a legacy product line?
Yes, this breaker belongs to the legacy ITE and Siemens J-Frame family. It is primarily sourced for replacing existing breakers in older FC, FCI, and FCII distribution interiors or expanding existing P4 and P5 panelboards.
Does this breaker mount onto standard DIN rail?
No, the JJ3B275 is a bolt-on molded case circuit breaker designed specifically to bolt directly to the busbars of compatible Siemens and ITE panelboards and switchboards.
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