Overview
The Square D 8903SMG12V04 is a Type S multipole lighting contactor enclosure designed for centralized control of lighting systems in commercial and industrial applications. With a 277V-60Hz coil rating, this enclosure houses a reliable switching device for managing multiple circuits. The Square D 8903SMG12V04 delivers UL Listed performance with short-circuit ratings up to 100,000 A, making it a trusted choice for facility managers and electrical contractors.
Key Features
- Type S multipole design—UL Listed with 100,000 A short-circuit rating
- 277V AC 60Hz coil voltage for standard industrial and commercial applications
- Fully rated for resistance loads up to 600V and motor loads with NEMA-equivalent horsepower ratings
- Electrically held mechanically held switchable design for flexible control logic
- Compact enclosure suitable for both centralized and remote lighting control
- Meets National Electrical Code (NEC) and UL 508 standards
Technical Specifications
- Coil Voltage: 277V AC
- Frequency: 60 Hz
- Poles: 4 (four normally open contacts)
- Current Rating: 30 Amps
- Short-Circuit Rating: 100,000 A at 480V
- Load Rating: Rated for resistance loads to 600V and motor loads with NEMA equivalent sizing
- Control Type: Electrically/Mechanically held switchable
- Enclosure Type: NEMA 1 (indoor, general purpose)
- Standards: UL Listed, meets NEC and UL 508 requirements
Typical Applications
- Centralized control panels for commercial and industrial lighting circuits
- Energy management systems for lighting load switching
- Resistance-type loads including electric furnaces, water heaters, and snow-melting applications
- Motor-driven lighting equipment and auxiliary circuits
- Multi-zone lighting control in facilities requiring remote on/off capability
- Time-clock and photocell-based lighting automation
Compatibility & Replacements
Compatible With
- Standard industrial control circuits rated for 277V AC supply
- Time clocks and photoelectric controls rated for 277V coil activation
- Building energy management and lighting control systems
- NEMA 1 control enclosures and switch cabinets
- Auxiliary contacts and interlocking hardware (standard Square D accessories)
Replaces / Drop-In Replacement For
- Verify with your control system integrator before ordering to confirm exact interchangeability with your legacy units
- Similar Square D 8903 series models with matching coil voltage (277V-60Hz) and pole configuration (4-pole)
Works With
- 277V AC control voltage supplies and transformers
- Standard industrial push-button stations and selector switches
- Digital timers and programmable photocell relay modules
- Building management system (BMS) interfaces with appropriate control relays
- Auxiliary contact kits for holding circuits and status signaling
