Overview
The Square D EZM31200GCBTMS is an EZ Meter-Pak main circuit breaker unit designed for overhead service entrance applications in utility metering systems. Rated at 1200A with a 240VAC maximum operating voltage and 3-phase/4-wire configuration, this unit features a 1200A bus with 65kA short-circuit current rating (SCCR). The NEMA 3R outdoor-rated enclosure provides protection from rain and sleet, while the integrated Energy Reduction Maintenance Setting (ERMS) reduces arc flash incident energy during maintenance operations without requiring PPE changes or zone selective interlocking equipment.
Features
- 1200A main circuit breaker with 1200A bus
- 240VAC maximum, 3-phase/4-wire (3Ph/4W)
- 65kA short-circuit current rating (SCCR)
- NEMA 3R enclosure — outdoor rated (rain/sleet protection)
- Overhead (OH) service configuration
- ERMS (Energy Reduction Maintenance Setting) for arc flash mitigation
- Wall mount configuration
Specifications
| Attribute | Value |
|---|---|
| Model | EZM31200GCBTMS |
| Manufacturer | Square D (Schneider Electric) |
| Series | EZ Meter-Pak |
| Product Type | Main Circuit Breaker Unit / Meter Center Main Unit |
| Amperage | 1200A |
| Bus Rating | 1200A |
| Voltage | 240VAC max |
| Phase / Wire | 3Ph / 4W |
| SCCR | 65kA |
| NEMA Rating | 3R |
| Service Entry | Overhead (OH) |
| Special Feature | ERMS |
| Mounting | Wall |
| UPC | 78590108624 |




