Square D LXL36125-1021 Molded Case Circuit Breaker
- 125A
- 3 Pole
- Unit Mount
Quantity
Square D LXL36125-1021 - 125A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Built for commercial applications, the LXL36125-1021 is a 3-pole, 125A electronic trip MCCB. It includes a factory-installed shunt trip enabling remote opening of the breaker for enhanced control. This legacy L-Frame breaker mounts into Square D switchboards and compatible enclosures. For modern upgrades, it is replaced by the PowerPacT H-Frame series (HJL36125SA). Delivering 65kAIC at 480V, it utilizes a Micrologic trip unit with adjustable LSI protection functions.Specifications
| Brand | Square D |
|---|---|
| Part Number | LXL36125-1021 |
| Series | LXL |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480Y/277VAC, 480VAC, 600Y/347VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480Y/277VAC, 65kA @ 480VAC, 35kA @ 600Y/347VAC, 35kA @ 600VAC |
| Amperage Range | 62.5-125A |
|---|
| Frame Type | LAL |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D L-Frame Enclosures, Switchboards |
| Wire Gauge | (1) 1 AWG-600 kcmil or (2) 1 AWG-250 kcmil (Al/Cu) |
| Max Wire | 600 kcmil (1 conductor) or 250 kcmil (2 conductors) |
| Min Wire | 1 AWG |
| Trip Technology | Electronic Trip |
|---|---|
| Trip Function Code | LSI |
| Trip Function | Long-Time, Short-Time, Instantaneous |
| Trip Adjustability | Adjustable |
| Trip Unit Model | MicroLogic |
| Available Options | Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Shunt Trip (120-240VAC) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | High Interrupting Capacity, HACR Rated |
Product FAQs
7 answersWhat does the -1021 suffix indicate on the LXL36125-1021 part number?
The -1021 suffix designates that this circuit breaker includes a factory-installed shunt trip accessory. This allows the breaker to be tripped remotely for enhanced control and safety in commercial applications.
What enclosures and panels are compatible with the LXL36125-1021?
This unit-mount breaker is designed for installation in Square D switchboards and compatible legacy L-Frame enclosures. It is a feed-thru breaker and is not compatible with I-Line panelboards.
What is the modern replacement for the legacy LXL36125-1021 breaker?
For modern upgrades, this legacy L-Frame breaker is typically replaced by the PowerPacT H-Frame series, such as the HJL36125SA. Verify shunt trip and mounting requirements with a licensed electrician before retrofitting.
What are the advantages of the Micrologic trip unit on this breaker?
The electronic Micrologic trip unit provides adjustable LSI (Long-Time, Short-Time, and Instantaneous) protection settings. This allows for highly accurate system coordination and customized protection curves compared to standard thermal-magnetic alternatives.
What wire sizes and materials are compatible with the lugs on this breaker?
The line and load side lugs accept either a single conductor from 1 AWG to 600 kcmil, or two conductors from 1 AWG to 250 kcmil. The terminals are rated for both aluminum and copper wire.
How is the LXL36125-1021 mounted in an electrical system?
This is a unit-mount, feed-thru circuit breaker. It is bolted directly to the mounting pan or enclosure and uses line and load side lugs for wire connections, rather than plugging into a busbar.
What is the purpose of the factory-installed shunt trip on this breaker?
The shunt trip allows the breaker to be opened remotely via an external electrical signal. This is commonly used for emergency power-offs, fire alarm system integration, or remote equipment control.
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