Square D LHP36400MB Molded Case Circuit Breaker
- 400A
- 3 Pole
- Unit Mount
Quantity
Square D LHP36400MB - 400A 3 Pole Molded Case Circuit Breaker
New
Quantity
Quantity
Square D LHP36400MB - 400A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Part Number | LHP36400MB |
| Series | LHP |
| Amperage | 400A |
| 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 |
| 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 |
Quantity
Square D LHP36400MB - 400A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Series | LHP |
| Amperage | 400A |
| 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 |
| 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 |
Description
Built for commercial and industrial power distribution, the Square D LHP36400MB is a 3-pole, 400A molded case circuit breaker. It delivers robust performance with a 35kAIC rating at 480VAC. Designed as a unit-mount breaker, it integrates easily into Square D switchboards, enclosures, and motor control centers. This legacy L-Frame model is ideal for maintaining existing infrastructure and is officially replaced by the LGL36400U31X. It includes fixed thermal-magnetic trip functions (LI).Specifications
| Brand | Square D |
|---|---|
| Part Number | LHP36400MB |
| Series | LHP |
| Amperage | 400A |
| 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 |
| 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
9 answersCan the trip settings on the LHP36400MB be adjusted for different loads?
No, this circuit breaker features a fixed thermal and fixed magnetic trip unit. The long-time overload and instantaneous short-circuit trip points are set at the factory and cannot be adjusted by the user.
What does the MB suffix indicate in the LHP36400MB catalog number?
The MB suffix denotes that this breaker is equipped with a short toggle handle. This design is often required in motor control centers or compact enclosures where standard toggle handles lack adequate door clearance.
Can I install this LHP breaker in a Square D I-Line panelboard?
No. The LHP36400MB is a unit mount breaker designed to bolt directly to a backpan. It lacks the plug-on jaw connectors required for I-Line panelboards. For an I-Line installation, an LHA or similar I-Line configured breaker is required.
What accessories can be field-installed on the LHP36400MB?
This breaker is compatible with standard Square D legacy accessories, such as shunt trips, undervoltage releases, and auxiliary switches. These are the same field-installable devices used across the legacy LA, LH, and Q4 circuit breaker frames.
Does the short handle on the LHP36400MB accept standard lockout devices?
Yes. Despite the shorter toggle handle, standard oversized or universal clamp-on lockout-tagout devices designed for Square D LH and LHP frames will securely attach to this breaker for safe maintenance procedures.
Is the LHP36400MB part of the modern PowerPact series?
No, this model belongs to the legacy Square D L-Frame family. While newer installations often utilize the modern PowerPact L-Frame series, the LHP36400MB serves as a direct replacement for older legacy switchboards and control centers without requiring retrofit kits.
Does the LHP36400MB offer ground fault protection?
No, this breaker is equipped with standard LI (long-time and instantaneous) trip functions for basic overload and short-circuit protection. It does not have the integrated ground fault capabilities found in LSIG trip units.
Can the LHP36400MB be loaded continuously to a full 400 amps?
No, this is a standard 80 percent rated circuit breaker. In compliance with National Electrical Code safety standards, any continuous load running for three hours or more should not exceed 80 percent of its maximum rating, which equates to 320 amps.
What is the difference between the Square D LHP36400MB and the LHL36400MB?
The difference lies in the terminal connections. The LHP series is configured with wire lugs on the load side (OFF end) only, while the line side uses terminal pads for bolting directly to a busbar. In contrast, the LHL series includes wire lugs on both the line and load ends.
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