Square D MHP36800 Molded Case Circuit Breaker
- 800A
- 3 Pole
- Bolt-On
Quantity
Square D MHP36800 - 800A 3 Pole Molded Case Circuit Breaker
Re-Certified
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Description
A dependable solution for commercial facilities, the Square D MHP36800 is an 800-amp, 3-pole molded case circuit breaker. It utilizes thermal-magnetic technology to deliver long-time and instantaneous (LI) protection. This unit features a bolt-on mounting style for secure installation into Square D panelboards. Facilities maintaining legacy systems can use this model, which is superseded by the MJA36800. It provides a robust 65kAIC rating at 480VAC and is fully HACR rated.Specifications
| Brand | Square D |
|---|---|
| Part Number | MHP36800-R |
| Series | MHP |
| Amperage | 800A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480Y/277VAC, 480VAC, 600Y/347VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 65kA @ 480Y/277VAC, 65kA @ 480VAC, 25kA @ 600Y/347VAC, 25kA @ 600VAC, 14kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D Switchboards, Panelboards |
| Wire Gauge | (3) 3/0 AWG - 500 kcmil (Al/Cu) |
| Max Wire | 500 kcmil |
| Min Wire | 3/0 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 |
|---|---|
| Accessories | Lugs (Load Side) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489, W-C-375B/GEN |
| Approval | CE, CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, Non-Interchangeable Trip |
Product FAQs
7 answersWhat enclosures are compatible with the MHP36800?
This bolt-on M-frame breaker is designed for installation in legacy Square D switchboards, panelboards, and standalone enclosures configured for unit-mount breakers. It is not compatible with I-Line plug-on panels.
What are the wire size requirements for the MHP36800 lugs?
The standard lugs on this breaker accept three 3/0 AWG to 500 kcmil conductors per phase. They are dual-rated for either aluminum or copper wire.
How does the adjustable magnetic trip work on this breaker?
The MHP36800 features a thermal-magnetic trip unit with a fixed thermal element for long-time overload protection and an adjustable magnetic element. The magnetic dial allows electricians to fine-tune the instantaneous short-circuit trip threshold to coordinate with other devices in the electrical system.
What is the modern replacement for the legacy MHP36800?
The MHP series has been superseded by the Square D PowerPact M-frame series. When replacing a bolt-on MHP36800, the PowerPact MJL36800 is the typical unit-mount equivalent with a matching 65kA at 480V rating, though the MHP36800 is still sourced for maintaining existing legacy systems.
Is the MHP36800 suitable for DC applications?
Yes, this breaker is rated for use in DC systems up to 250VDC, with an interrupting capacity of 14kA.
How is the MHP36800 mounted?
This is a unit-mount circuit breaker. It bolts directly to the bus or mounting pan in compatible Square D enclosures, unlike I-Line breakers which plug onto the bus.
Does the MHP36800 provide ground fault protection?
No, the standard MHP36800 features an LI (Long-Time and Instantaneous) trip unit, which provides overload and short-circuit protection. It does not include integrated ground fault protection.
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