Square D QMJ363T - 100A, 600V, 3-Pole Panelboard Switch / Switchboard Unit | AmpState

The Square D QMJ363T is a purpose-built 3-pole fusible panelboard switch designed to simplify and safeguard lighting and distribution panelboards in commercial, warehouse, and light industrial environments. With a robust 100 A rating at up to 600 V, this QMJ-series unit delivers clean isolation across all three phases, ensuring a reliable path for switching loads while coordinating protection with the correct upstream fuse class.

Why this panelboard switch stands out

• Coordinated three-phase isolation: The 3-pole design ensures all live lines disconnect simultaneously, providing a clear shutdown route during maintenance or fault conditions.
• Integrated protection when paired with the right fuse class: Designed to work with compatible upstream protection to minimize fault energy and downtime.
• Trusted Square D engineering: Built on Schneider Electric’s proven reliability, offering a seamless fit into standard panelboard assemblies.
• Field-replaceable protection potential: Ideal for installations that require straightforward, serviceable protection while maintaining compliance and safety.

Ideal use cases

• Upgrading lighting and distribution panelboards in commercial spaces, warehouses, and light industrial facilities
• Retrofits or new installations where reliable 3-phase isolation and overcurrent protection are required
• Applications demanding easy, field-replaceable protection with a trusted brand

How it works

The QMJ363T acts as a fusible switch within a panelboard. It provides a clear switching path for loads while delivering protective coordination when upstream fuse elements trip or blow. For optimal performance, pair it with the appropriate fuse class and upstream protection as specified for your panelboard configuration. This approach helps minimize fault energy, reduces downtime, and supports safer maintenance procedures.

Installation and compatibility

• Ensure your panelboard configuration uses a compatible fuse class and upstream protection to achieve the intended coordination.
• Verify system voltage and current ratings align with 600 V, 100 A, and 3-pole configuration.
• Mount and wire per local electrical codes and the panelboard manufacturer's instructions to ensure proper isolation and pickup characteristics.

Specifications at a glance

• Amperage: 100 A
• Voltage: 600 V
• Poles: 3
• Series: QMJ
• Manufacturer: Square D / Schneider Electric
• Part Number: QMJ363T
• Best for: lighting and distribution panelboards
• Key function: fusible switching with integrated protection when used with compatible fuse class

Why AmpState backs this solution

Backed by a legacy of Schneider Electric engineering, the Square D QMJ363T provides a dependable, easy-to-integrate option for robust panelboard protection. AmpState supports you with solutions built to keep electrical distributions running smoothly, with clarity in design, installation, and ongoing maintenance.