Square D LAF3640028M Circuit Breaker
- 400
- 3 Pole
- Bolt-On
Square D
LAF3640028M
Circuit Breaker
Brand
Square D
SKU
LAF3640028M
Quantity
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Square D LAF3640028M 3 Pole Circuit Breaker
New
Quantity
Quantity
Square D LAF3640028M 3 Pole Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Series | LAF |
| Amperage | 400 A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600V |
| Phase | 3 |
| AIC Rating | 42kAIC at 240VAC, 30kAIC at 480VAC, 22kAIC at 600VAC |
| For Use With | Square D Motor Control Centers, Combination Starters |
|---|---|
| Wire Gauge | AWG 1 to 600KCmil, Al/Cu or 2, AWG 1 to 250KCmil, Al/Cu |
| Trip Function Code | I |
|---|
| Accessories | Lugs Not Included |
|---|---|
| Approval | CSA, IEC, UL |
| Construction Features | Motor Circuit Protector, Adjustable Instantaneous Trip |
Quantity
Square D LAF3640028M 3 Pole Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Series | LAF |
| Amperage | 400 A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600V |
| Phase | 3 |
| AIC Rating | 42kAIC at 240VAC, 30kAIC at 480VAC, 22kAIC at 600VAC |
| For Use With | Square D Motor Control Centers, Combination Starters |
|---|---|
| Wire Gauge | AWG 1 to 600KCmil, Al/Cu or 2, AWG 1 to 250KCmil, Al/Cu |
| Trip Function Code | I |
|---|
| Accessories | Lugs Not Included |
|---|---|
| Approval | CSA, IEC, UL |
| Construction Features | Motor Circuit Protector, Adjustable Instantaneous Trip |
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Description
Square D LAF3640028M 3 Pole Circuit Breaker
The Square D LAF3640028M is a 3 Pole magnetic molded case circuit breaker with a current rating of 400 Amps and a voltage rating of 600V. It has an interrupting rating of 42kAIC at 240VAC, 30kAIC at 480VAC, 22kAIC at 600VAC. The LAF3640028M has a bolt-on connection type and includes instantaneous trip functions.
Specifications
| Brand | Square D |
|---|---|
| Series | LAF |
| Amperage | 400 A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600V |
| Phase | 3 |
| AIC Rating | 42kAIC at 240VAC, 30kAIC at 480VAC, 22kAIC at 600VAC |
| For Use With | Square D Motor Control Centers, Combination Starters |
|---|---|
| Wire Gauge | AWG 1 to 600KCmil, Al/Cu or 2, AWG 1 to 250KCmil, Al/Cu |
| Trip Function Code | I |
|---|
| Accessories | Lugs Not Included |
|---|---|
| Approval | CSA, IEC, UL |
| Construction Features | Motor Circuit Protector, Adjustable Instantaneous Trip |
Product FAQs
6 answersDoes the LAF3640028M provide thermal overload protection?
No. The LAF3640028M is a magnetic-only circuit breaker, also known as a Motor Circuit Protector (MCP). It provides instantaneous short-circuit protection but lacks a thermal element. It must be paired with a separate overload relay or motor starter to provide complete motor protection.
What equipment is the LAF3640028M designed to be installed in?
This legacy L-Frame bolt-on circuit breaker is primarily designed for use in Square D Motor Control Centers (MCCs) and combination starters. It is not intended for standard load centers or I-Line panelboards, which require plug-on connections.
Can I adjust the trip settings on the LAF3640028M?
Yes, this breaker features an adjustable magnetic trip unit. This allows you to fine-tune the instantaneous short-circuit response to match the specific inrush current characteristics of your motor application, preventing nuisance tripping during startup.
Is the Square D LAF3640028M still in active production?
The LAF series is a legacy L-Frame molded case circuit breaker. While it may be replaced by newer series for modern switchgear designs, exact replacements are still sourced for maintaining and servicing existing Square D motor control centers without requiring a complete system retrofit.
Can I run parallel conductors to the LAF3640028M terminals?
Yes, the standard lugs on this breaker accommodate parallel runs. While it accepts a single conductor up to 600 kcmil, you can alternatively terminate two conductors per phase ranging from 1 AWG to 250 kcmil for both aluminum and copper wire. This flexibility can make routing wire in tight motor control centers easier.
What does the M suffix indicate in the LAF3640028M catalog number?
In Square D nomenclature, the M suffix on this breaker designates it as a motor circuit protector with a specific magnetic trip range. It is engineered specifically for motor protection applications rather than general power distribution.
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