Square D 8903LG20V04 Lighting Contactor 2 Pole 277V

Product Description

The SQUARE D 8903LG20V04 is an electrically held lighting contactor rated for NEMA 1 enclosures, designed to switch lighting loads in commercial and industrial electrical distribution systems. It features a 2-pole, 2NO contact configuration and handles 20 amps on tungsten lamp loads and 30 amps on fluorescent lamp loads, with a control circuit voltage of 277 VAC at 60 Hz. Weighing 9.71 pounds, this contactor is built for panel or enclosure mounting where reliable, electrically held switching of lighting circuits is required. Licensed electricians install this device as part of branch-circuit lighting control in commercial buildings, tenant spaces, and industrial facilities.

This contactor is suited for commercial lighting control applications involving fluorescent and tungsten lamp loads. The electrically held design keeps contacts closed as long as the control voltage is applied, making it appropriate for centralized lighting control panels and energy management systems. It is typically installed inside NEMA 1 rated enclosures in indoor, dry locations. The 277 VAC control circuit voltage matches standard single-phase lighting branch circuits commonly found in commercial construction.

Key Features

• Electrically held operation — contacts remain closed while control voltage is maintained
• 2-pole, 2NO contact configuration for switching two lighting circuit legs simultaneously
• 20A tungsten and 30A fluorescent load ratings on a single device
• 277 VAC at 60 Hz control circuit voltage matches commercial lighting branch circuits
• NEMA 1 enclosure rating for indoor, dry location installation
• UL Listed, CSA certified, and RoHS compliant

Compatibility

Designed as an OEM-style electrically held lighting contactor replacement for NEMA 1 rated commercial lighting control panel applications requiring 2-pole switching at 277 VAC.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC). De-energize and lock out the panel before mounting or wiring the contactor. Verify the control circuit voltage source matches the 277 VAC at 60 Hz rating before applying power. Confirm the enclosure maintains its NEMA 1 rating after installation and that all conductors are properly terminated per applicable code.