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Square D LHL36400MB Molded Case Circuit Breaker
- 400A
- 3 Pole
- Unit Mount
Square D
LHL36400MB
Molded Case Circuit Breaker
Brand
Square D
SKU
LHL36400MB
Quantity
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Square D LHL36400MB - 400A 3 Pole Molded Case Circuit Breaker
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Description
Configured with a space-saving short handle, this 400A molded case circuit breaker provides reliable thermal-magnetic trip functions. It serves heavy commercial power distribution needs. The unit-mount design integrates into older Square D L-frame enclosures and panelboards. While this model is a legacy component, it can be substituted by the newer PowerPact LGL36400 series. Rated for 65kA at 240VAC, the device ensures excellent fault clearing and features a push-to-trip testing mechanism.Specifications
| Brand | Square D |
|---|---|
| Part Number | LHL36400MB |
| Series | LHL |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 25kA @ 600VAC, 50kA @ 250VDC |
| Frame Type | LHL |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D L-Frame Enclosures, Switchboards, Panelboards |
| Wire Gauge | (1) 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, Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Lugs (AL400LA), Short Handle |
| Standards | CSA C22.2 No. 5, HACR, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, Mercury Free, RoHS Compliant, Push-to-Trip, Short Handle |
Product FAQs
6 answersWhat does the "MB" suffix mean in the LHL36400MB catalog number?
The "MB" suffix indicates that the circuit breaker is equipped with a shorter handle. This design allows the breaker to fit properly behind panel doors in specific enclosures where a standard handle would prevent the door from closing.
What enclosures and panels are compatible with this breaker?
The LHL36400MB is a unit mount breaker designed for use in older Square D L-Frame enclosures, as well as compatible legacy switchboards and panelboards.
What wire sizes are accepted by the lugs on this breaker?
The standard lugs accept either one 1 AWG to 600 kcmil wire or two 1 AWG to 250 kcmil wires per phase. Both aluminum and copper conductors are supported.
Is the LHL36400MB still in active production?
The Square D L-Frame series is a legacy product line. For new installations or direct upgrades, it has largely been replaced by the newer PowerPact L-Frame series, such as the LGL36400.
How does the trip unit operate on this breaker?
This breaker features a thermal magnetic trip unit with fixed thermal and adjustable magnetic settings. The adjustable magnetic function allows you to set the instantaneous short-circuit trip point to coordinate with other devices in your electrical system.
Does this breaker include a push-to-trip feature?
Yes, it includes a push-to-trip button. This allows you to manually trip the breaker to verify the mechanical operation of the tripping mechanism without exposing personnel to live parts.
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