Square D NQ18L1C Panelboard Interior 18 Circuit 100A

The Square D NQ18L1C panelboard interior is an 18-space, 100 A main-lug assembly designed for 240 V ac, single-phase service with a 3-wire configuration. Built for use with NQ-series breakers, it features a copper bus and is commonly installed as a panelboard interior in commercial and light-industrial electrical rooms where a main disconnect is provided separately or where the service equipment supplies the disconnect. With 18 pole spaces, it supports up to 18 branch circuits, and its 100 A rating defines the maximum service ahead of the distribution breakers. The interior is rated for 240 V AC operation and also carries a 48 V DC rating for DC control circuits where required. This configuration is suitable for load centers, distribution panels, and service equipment cabinets that require a 1-phase, 3-wire layout in one enclosure. The copper bus construction ensures dependable conductivity and ease of breaker installation, while the main-lug design avoids a factory-installed main breaker, giving installers flexibility to configure the disconnect arrangement to match site requirements. When used as part of a complete NQ panel system, the interior accepts standard NQ breakers and integrates into Schneider Electric’s broader NQ merchandising ecosystem for consistent performance across commercial power distribution setups.