Square D MAL Series Circuit Breakers
The Square D MAL series is a legacy M-Frame molded case circuit breaker rated for 1000A frame size and 600VAC operation. MAL breakers cover the 300A to 1000A range for main switchboard applications, large industrial distribution, and service entrance equipment.
Series Specifications
| Frame | M-Frame — 1000A Frame |
|---|---|
| Amperage Range | 300A – 1000A |
| Voltage | 600VAC |
| Poles | 3-Pole |
| Interrupting Rating | 65kA @ 600V / 65kA @ 480V / 100kA @ 240V |
| Mounting | I-Line Plug-In |
| Trip Type | Thermal Magnetic LI |
History and Replacement Context
The Square D MAL M-Frame was designed for the largest I-Line applications, providing main breaker protection for large commercial and industrial switchboards.
Typical Applications
- Main switchboard breakers
- Large industrial distribution
- Service entrance equipment
- Large feeder protection
- Industrial plant mains