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Square D Q1U3100 Molded Case Circuit Breaker
- 100A
- 3 Pole
- Unit Mount
Square D
Q1U3100
Molded Case Circuit Breaker
Brand
Square D
SKU
Q1U3100
Quantity
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Square D Q1U3100 - 100A 3 Pole Molded Case Circuit Breaker
Re-Certified
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100A 3 Pole Molded Case Circuit Breaker
100A 3 Pole Molded Case Circuit Breaker
Description
Delivering 100A of thermal-magnetic protection, the Square D Q1U3100 is a 3-pole molded case circuit breaker designed for commercial and industrial use. It features a robust Q-frame construction tailored for legacy power distribution systems. This unit mounts into individual enclosures and OEM panels. If substituting with the newer QOU3100, be aware that the QOU is three inches shorter and will require mounting adjustments. It provides a 10kAIC rating at 240VAC and includes HACR certification.Specifications
| Brand | Square D |
|---|---|
| Part Number | Q1U3100-R |
| Series | Q1U |
| Amperage | 100A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Individual Enclosures, OEM Panels |
| Wire Gauge | 6-1/0 AWG (Al/Cu) |
| Max Wire | 1/0 AWG |
| Min Wire | 6 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release |
|---|---|
| Accessories | Line and Load Lugs Included |
| Standards | UL 489, CSA C22.2 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
Product FAQs
6 answersIs the Square D Q1U3100 still manufactured?
The Q1U series is a legacy Q-frame circuit breaker and is no longer in active production. The modern Square D QOU3100 can serve as a functional replacement, though it is three inches shorter and requires mounting modifications to fit the same enclosure footprint.
What type of enclosures can the Q1U3100 be installed in?
This unit mount circuit breaker is designed for installation in individual enclosures and older OEM panels that accommodate a 6.25-inch height profile.
Can I use the Q1U3100 as a direct drop-in replacement for a QOU breaker?
No. While they share similar electrical characteristics, the legacy Q1U frame is significantly longer than the modern QOU frame. Replacing one with the other requires adjusting the mounting hardware or enclosure standoffs.
Is the Q1U3100 suitable for HVAC applications?
Yes, this circuit breaker is HACR rated, meaning it is certified for use with heating, air conditioning, and refrigeration equipment.
Does the Q1U3100 mount onto a DIN rail?
No, this is a unit mount circuit breaker. It is designed to be secured directly to the backpan of an enclosure or panel using mounting screws, rather than snapping onto a standard DIN rail.
How does the thermal-magnetic trip unit function on this breaker?
The fixed thermal-magnetic trip unit provides dual protection (LI). The thermal component responds to sustained overloads (Long-Time), while the magnetic component reacts immediately to sudden short circuits (Instantaneous).
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