The Schneider Electric Masterpact NSX100N is a compact, fixed-mounted molded case circuit breaker (MCCB) from the premium NSX range. The "N" denotes its Standard breaking capacity. The unique rating "44/63A" specifies that this particular model is equipped with a fixed Thermal-Magnetic (TM-D) trip unit and its maximum continuous current rating depends on the number of poles used: 44 Amperes for a 3-pole configuration, and 63 Amperes for a 1-pole (or 2-pole) configuration. It provides reliable, cost-effective protection against overloads and short-circuits for small feeder circuits and equipment in commercial and light industrial applications.
Parameters:
Parameter Value / Description
Product Line / Frame Size Masterpact NSX100
Breaking Capacity Standard (N Rating)
Rated Ultimate Breaking Capacity (Icu) Typically 50 kA at 415V AC (IEC 60947-2).
Trip Unit Type Fixed Thermal-Magnetic (TM-D) – Non-adjustable.
Current Rating (In) 44 A when used in 3-pole configuration.
63 A when used in 1-pole (or 2-pole) configuration.
Number of Poles Typically supplied as a 3-pole (3P) unit. The 44A rating applies in this configuration. To achieve 63A, it would need to be used or reconfigured as a 1P unit (uncommon for NSX).
Rated Operational Voltage (Ue) Up to 690 V AC
Protection Functions • Thermal (Overload): Bi-metal element, inverse time characteristic.
• Magnetic (Short-Circuit): Instantaneous trip. No Ground Fault (G) protection.
Standard IEC 60947-2
Mounting Fixed (This is implied by the TM-D unit; fixed version is standard for this trip type).
Connection Front or Rear connection (depends on specific kit).
Width (3-pole fixed) Approx. 105 mm