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Square D LHP36300MB Molded Case Circuit Breaker
- 300A
- 3 Pole
- Unit Mount
Square D
LHP36300MB
Molded Case Circuit Breaker
Brand
Square D
SKU
LHP36300MB
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Square D LHP36300MB - 300A 3 Pole Molded Case Circuit Breaker
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300A 3 Pole Molded Case Circuit Breaker
300A 3 Pole Molded Case Circuit Breaker
Description
Engineered for heavy-duty industrial applications, the Square D LHP36300MB is a 3-pole, 300A molded case circuit breaker. It provides reliable overcurrent protection for complex electrical systems. This unit-mount MCCB installs into Square D switchboards and motor control centers. As a legacy L-Frame device, it serves as an exact replacement for older installations, though superseded by the LGL36300U31X. Rated 35kAIC at 480VAC, it features fixed thermal-magnetic trip settings (LI).Specifications
| Brand | Square D |
|---|---|
| Part Number | LHP36300MB |
| Series | LHP |
| Amperage | 300A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480Y/277VAC, 480VAC, 600Y/347VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480Y/277VAC, 35kA @ 480VAC, 25kA @ 600Y/347VAC, 25kA @ 600VAC, 50kA @ 250VDC |
| Frame Type | LHP |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D Switchboards, Motor Control Centers, Enclosures |
| Wire Gauge | 1 AWG-600 kcmil (Al/Cu) or (2) 1 AWG-250 kcmil (Al/Cu) |
| Max Wire | 600 kcmil |
| Min Wire | 1 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, Alarm Switch |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, HACR, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, Short Handle, Push-To-Trip Mechanism |
Product FAQs
6 answersWhat enclosures or panels accept the LHP36300MB?
This legacy L-frame breaker is designed for unit-mount, bolt-on installations in Square D switchboards, motor control centers, and standalone enclosures.
What wire sizes are accepted by the lugs on the LHP36300MB?
The factory-installed lugs accept either one 1 AWG to 600 kcmil aluminum or copper wire, or two 1 AWG to 250 kcmil aluminum or copper wires per phase.
Is the LHP36300MB still in active production?
No, the LHP36300MB is a legacy L-frame molded case circuit breaker. While exact replacements are available to maintain existing installations, new system designs typically utilize the current PowerPact L-frame series.
What does the MB suffix indicate on the LHP36300MB?
The MB suffix designates a short handle or short lever actuator. Note that standard external operating mechanisms may not be compatible with short handle breakers.
Can the LHP36300MB be used in DC applications?
Yes, this thermal-magnetic breaker is rated for use in DC systems up to 250VDC, providing an interrupting capacity of 50kAIC.
Are the trip settings adjustable on the LHP36300MB?
No, this breaker features a fixed thermal and fixed magnetic trip unit. The long-time and instantaneous trip functions are factory-set and cannot be adjusted in the field.
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