Square D MA1000S 1000A 3-Pole 600 V Circuit Breaker

Square D MA1000S is a high-capacity three-pole circuit breaker engineered for demanding, three-phase power systems. With a 1000 A current rating and a 600 V maximum voltage, this device delivers reliable overcurrent protection for large feeders and industrial circuits while maintaining clean, coordinated shutdown of all three phases.

Key specifications

• Current rating: 1000 A
• Poles: 3
• Voltage rating: 600 V
• Part number: MA1000S
• Brand: Square D

Why the MA1000S stands out for heavy-duty applications

The MA1000S provides synchronized disconnection across all three phases, a critical feature for protecting large three-phase feeders and motor-driven loads. Built for industrial environments, it supports robust protection in distribution panels where high capacity and reliable interruption are essential. Choosing this model means you’re safeguarding equipment, reducing the risk of cascading faults, and supporting safer, more stable power distribution in demanding facilities.

Ideal applications

• Main feeders and large distribution panels in manufacturing facilities
• Three-phase power systems in warehouses, data centers, and large commercial buildings
• Motor control centers and other high-current, three-phase installations requiring 600 V protection

Practical installation and use tips

• Verify panel compatibility: ensure your switchgear supports MA-series three-pole, 600 V devices and the 1000 A rating.
• Follow electrical codes and safety procedures during installation and maintenance.
• For upgrades, confirm the device’s interrupting characteristics and physical fit within the enclosure and bus arrangement.
• Store and handle the breaker in accordance with manufacturer guidelines to preserve performance and reliability.

Equip your power distribution with a trusted Square D solution designed for high-demand environments. The MA1000S delivers solid, dependable protection for large, three-phase systems at 600 V, keeping critical operations safeguarded and downtime minimized.