The Schneider Electric Masterpact NSX is a premium four-pole, 250A molded case circuit breaker (MCCB) designed for main distribution, busbar tie, and critical feeder protection in three-phase four-wire (3P+N) systems.
Parameters :
Parameter Value / Description
Product Line / Frame Size Masterpact NSX250
Rated Current (In) Up to 250 A (Adjustable via electronic trip unit).
Number of Poles 4 (L1, L2, L3, N)
Breaking Capacity [Must be Specified] – N (50kA), S (70kA), H (100kA), L (150kA) at 415V.
Rated Ultimate Breaking Capacity (Icu) Depends on chosen rating (see above).
Trip Unit [Must be Specified] – Electronic Micrologic Only. Options include:
• Micrologic 2.2: Basic protection (LSI).
• Micrologic 5.2/6.2: Adds ground fault (G) protection.
• Micrologic 5.2E/6.2E/7.0A: Adds advanced measurement & communication.
Communication Native in “E” and “A” series units (Ethernet, Modbus TCP).
Mounting Withdrawable (standard) or Fixed.
Neutral Configuration Usually 4P4D (all poles protected) or 4P3D (neutral switched only).
Standard IEC 60947-2
Typical Width Approx. 220 mm (for 4-pole withdrawable unit).