Square D® Power-Zone® 4 low voltage metal-enclosed drawout switchgear is designed to provide superior electrical distribution, protection, and power quality management. The prime components of the switchgear are the Masterpact® NW and NT ANSI rated circuit breaker. Power-Zone 4 switchgear is designed to maximize the functionality of the Masterpact circuit breakers, which, in turn, deliver maximum uptime, system selectivity, ease of maintenance, and reliable circuit protection. All of these features are packed into the smallest footprint available for low voltage drawout switchgear.

• Designed and built to ANSI® C37.20.1 and is Listed to UL® 1558
• Masterpact NW and NT drawout low voltage power circuit breakers are designed and built to ANSI C37.13 and C37.16. Listed to UL 1066
• Short-circuit current rating up to 200 kA without fuses
• High short-time withstand ratings up to 100 kA for 30 cycles, minimum
• Arc flash limiting Masterpact NW feeder breakers available in 800, 1600, and 2000 ampere ratings
• Family of field installable and upgradeable Micrologic® trip units with optional Powerlogic® data communications features
• Optional Transparent Ready® Web-enabled data communications capability
• Smallest equipment footprint available in this product class
• Front access to control and communications wire connections
• Bolted copper bus provided as standard (up to 5000 amperes maximum)
• Large rear cable compartment pull area allowing maximum room for power cables
• Bus provision for future equipment expansion
• System designed for maximum uptime with low maintenance
• Modular circuit breaker designed for easy addition of control accessories
• Available in NEMA 3R outdoor walk-in enclosures
• Optional Masterpact NW Remote Racking Device

Masterpact NW circuit breakers are available in various levels of interrupting ratings from 42–200 kA at 480 volts and 130 kA at 600 volts.

The Masterpact NT circuit breaker is available in an 800 ampere frame size and 42 kA at 480 volts interrupting rating. Up to 8 Masterpact NT circuit breakers can be mounted in a 30-inch wide section. (Not available for 600 volts.)

Circuit breakers of like frame sizes and interrupting ratings are interchangeable.