Square D Q1390 Molded Case Circuit Breaker
- 90A
- 3 Pole
- Plug-On
Quantity
Square D Q1390 - 90A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Providing robust overcurrent protection, this 90A Square D MCCB is engineered for demanding commercial environments. The three-pole design ensures reliable performance across heavy-duty applications. This unit features a plug-on connection tailored for legacy Square D Q1 panelboards. Users looking for modern equivalents can transition to the QO390 model. Delivering 10kAIC at 240VAC, it includes a padlock attachment option and Visi-Trip technology for enhanced operational safety.Specifications
| Brand | Square D |
|---|---|
| Part Number | Q1390-R |
| Series | Q1 |
| Amperage | 90A |
| Poles | 3 |
| Mounting Style | Plug-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D Q1 Panelboards |
| Wire Gauge | 6 AWG - 1/0 AWG (Cu), 4 AWG - 1/0 AWG (Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 6 AWG (Cu), 4 AWG (Al) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Padlock Attachment |
|---|---|
| Standards | CSA C22.2, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated, Common Trip |
Product FAQs
6 answersWhich panelboards accept the Square D Q1390 circuit breaker?
The Q1390 is designed exclusively for legacy Square D Q1 series panelboards and load centers. It features a specific plug-on footprint that matches older Q1 busbar configurations.
What are the acceptable wire gauges for the Q1390 terminals?
The load lugs accommodate 6 AWG to 1/0 AWG copper conductors, or 4 AWG to 1/0 AWG aluminum conductors.
How does the thermal-magnetic trip unit on the Q1390 operate?
The fixed thermal-magnetic trip unit provides dual protection. It uses a thermal element for sustained overloads (Long-Time) and a magnetic element that trips immediately during short-circuit faults (Instantaneous).
Is the Square D Q1 series still in active production?
No, the Q1 frame is a legacy series that has been discontinued by Schneider Electric. Sourcing a direct Q1390 replacement allows you to maintain existing Q1 enclosures without the expense of a complete panelboard upgrade.
How can I identify if the Q1390 has tripped in the panel?
This breaker features Square D Visi-Trip technology. When a fault occurs and the breaker trips, a highly visible red indicator appears in the window, allowing for rapid identification of the tripped circuit.
Does this breaker require bolt-on hardware for installation?
No, the Q1390 is a plug-on molded case circuit breaker. It snaps directly onto the busbar of compatible Q1 enclosures, eliminating the need for mounting screws or bolt-on connectors.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 1 review.
- JTJeff T.ReviewingSquare D Q12100 - 100A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/23/18Refurbished breaker
Found the correct breaker, it was very easy to find. Great price and shipped out on time. Definitely recommend this company.