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Square D JJA36250U53X Molded Case Circuit Breaker
- 250A
- 3 Pole
- I-Line
Square D
JJA36250U53X
Molded Case Circuit Breaker
Brand
Square D
SKU
JJA36250U53X
Quantity
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Square D JJA36250U53X - 250A 3 Pole Molded Case Circuit Breaker
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Description
The Square D JJA36250U53X is a 250A, 3-pole molded case circuit breaker from the PowerPacT J-Frame family. Built for commercial and industrial applications, it delivers robust overcurrent protection for heavy-duty electrical systems. This unit features an I-Line plug-on connection, installing into Square D I-Line panelboards and switchboards. It accepts 3/0 AWG to 350 kcmil wiring. Equipped with a Micrologic 5.2E trip unit, it provides adjustable LSI protection and energy metering.Specifications
| Brand | Square D |
|---|---|
| Part Number | JJA36250U53X |
| Series | JJA |
| Amperage | 250A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC |
| Amperage Range | 63-250A |
|---|
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D I-Line Panelboards, Square D I-Line Switchboards |
| Wire Gauge | 3/0 AWG - 350 kcmil (Al/Cu) |
| Max Wire | 350 kcmil |
| Min Wire | 3/0 AWG |
| Trip Technology | Electronic Trip |
|---|---|
| Trip Function Code | LSI |
| Trip Function | Long-Time, Short-Time, Instantaneous |
| Trip Adjustability | Adjustable |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment, Motor Operator |
|---|---|
| Accessories | Micrologic 5.2E Trip Unit (Energy) |
| Standards | CSA C22.2 No 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CCC, CE, CSA, IEC, NEMA, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Current Limiting, Visual Trip Indicator, Mercury Free, PVC Free, True RMS Sensing |
Product FAQs
6 answersWhat equipment is the JJA36250U53X compatible with?
This breaker is specifically designed for installation in Square D I-Line panelboards and switchboards. It uses a plug-on I-Line connection for the line side, meaning it cannot be used in standard unit-mount or drawout enclosures.
What does the U53X suffix in the JJA36250U53X catalog number indicate?
The U53X suffix designates a Micrologic 5.2 E (Energy) electronic trip unit. This provides adjustable Long-time, Short-time, and Instantaneous (LSI) protection, along with built-in energy metering capabilities for advanced power monitoring.
What does the JJA prefix in the JJA36250U53X catalog number mean?
The first J indicates the PowerPacT J-Frame family. The second J designates the interrupting rating class, which provides 100kA at 240VAC, 65kA at 480VAC, and 25kA at 600VAC. The A indicates an I-Line plug-on termination style.
How is the JJA36250U53X wired and installed?
The breaker features an I-Line plug-in connection on the line side, which presses directly onto the panelboard bus stack and requires no cabling. The load-side mechanical lugs accept aluminum or copper conductors ranging from 3/0 AWG to 350 kcmil.
Is the JJA36250U53X rated for 100% continuous operation?
No, this standard PowerPacT J-Frame breaker carries an 80% continuous current rating. Continuous loads lasting three hours or more should not exceed 200 amps, which is 80% of its 250A maximum rating.
Can I adjust the trip settings on the JJA36250U53X?
Yes, the integrated Micrologic 5.2 E trip unit allows electricians to fine-tune the Long-time, Short-time, and Instantaneous (LSI) pickup and delay settings to coordinate with other protective devices in the electrical system.
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