Square D MHL367001021 Molded Case Circuit Breaker
- 700A
- 3 Pole
- Unit Mount
Quantity
Square D MHL367001021 - 700A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Part of Square D's legacy M-frame series, the MHL367001021 is a 700A, 3-pole MCCB built for industrial applications. It provides reliable long-time and instantaneous (LI) protection. This unit-mount breaker installs into standard switchboards and motor control centers. It is replaced by the MJL36700 (requires S29386 shunt trip). Rated at 65kAIC at 480V, this model features a factory-installed 120-240V shunt trip (1021 suffix) for remote operation.Specifications
| Brand | Square D |
|---|---|
| Series | MHL |
| Amperage | 700A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC, 14kA @ 250VDC |
| Frame Type | MHL |
|---|---|
| Terminal Type | Lugs |
| For Use With | Switchboards, Motor Control Centers, Industrial Enclosures |
| 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 | Undervoltage Release, Auxiliary Switch, Alarm Switch |
|---|---|
| Accessories | Shunt Trip (120-240 VAC), Lugs |
| Standards | CSA C22.2 No. 5, IEC 60947-2, UL 489 |
| Approval | CE, CSA, IEC, NOM, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, Non-Interchangeable Trip |
Product FAQs
7 answersWhat does the "1021" suffix indicate on the MHL367001021 part number?
The 1021 suffix designates that this breaker comes with a factory-installed 120/240VAC shunt trip. This allows the breaker to be opened remotely via an external control signal.
What are the wire size requirements for the MHL367001021 lugs?
The standard lugs accommodate three 3/0 AWG to 500 kcmil wires per phase. They are compatible with both aluminum and copper conductors.
How do I adjust the trip settings on the MHL367001021?
This thermal-magnetic breaker features a fixed thermal element for long-time overload protection, meaning the 700A continuous rating cannot be changed. However, the magnetic instantaneous trip is adjustable to coordinate with downstream loads and prevent nuisance tripping during inrush currents.
Can I install the MHL367001021 in a Square D I-Line panelboard?
No, the MHL367001021 is a unit-mount, feed-thru circuit breaker designed for hardwired installations in switchboards, motor control centers, and industrial enclosures. It does not have the plug-on jaw connections required for I-Line panelboards.
How does the integrated shunt trip improve system safety?
The built-in 120/240VAC shunt trip allows the breaker to be wired to emergency stop buttons, fire suppression systems, or external relays. When a voltage signal is applied to the shunt trip coil, it mechanically forces the breaker to open, immediately cutting power to the load during an emergency.
Is the MHL367001021 suitable for DC power systems?
Yes, in addition to its AC ratings, this breaker is rated for 250VDC applications with a 14kA interrupting capacity, making it suitable for certain industrial DC drives, battery backups, or solar applications.
What does the "LI" trip function code mean on this breaker?
The LI designation means the thermal-magnetic trip unit provides Long-Time (L) protection for overloads and Instantaneous (I) protection for short circuits.
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