Schneider C4042D250 Trip Unit Micrologic 2.3, ComPact NSX400/630, 4P 250A

The Schneider Electric C4042D250 is a MicroLogic 2.3 electronic trip unit designed for ComPact NSX400/630 4-pole circuit breakers, providing advanced LSoI protection - long-time overload, short-time short-circuit with fixed delay, and instantaneous short-circuit protection at a rated current of 250A.

Technical specifications:

• Commercial reference: C4042D250
• Manufacturer: Schneider Electric
• EAN:
• Series / range: ComPact NSX400/630 new generation
• Trip unit name: MicroLogic 2.3
• Trip unit technology: Electronic
• Number of poles: 4P
• Protected poles description: 3d + N/2, 4d, 3d
• Neutral conductor position: Left
• Trip unit rating: 250A at 40°C
• Rated voltage [Ue]: 690V AC 50/60 Hz
• Network type: AC
• Network frequency: 50/60 Hz
• Protection function: LSoI
• Long-time pick-up (Ir): 70...250A, 9 adjustable settings
• Long-time delay (tr): Fixed - 11s at 7.2x Ir, 16s at 6x Ir, 400s at 1.5x Ir
• Neutral protection settings: 0.5x Ir (3d + N/2), 1x Ir (4d), no protection (3d)
• Thermal memory: 20 minutes before and after tripping
• Short-time pick-up (Isd): 1.5...10x Ir, 9 adjustable settings
• Short-time delay (tsd): Fixed
• Instantaneous pick-up (Ii): Fixed, 3000A
• Mounting mode: Fixed
• Standard: EN/IEC 60947-2
• Electric shock protection class: Class II
• Pollution degree: 3 per IEC 60947-1
• IP protection rating: IP40 per IEC 60529
• Operating temperature: -25...70°C
• Storage temperature: -50...85°C
• Weight: 1.77 kg

Features and benefits:

• LSoI triple protection function covers overload, short-circuit with delay, and instantaneous short-circuit in a single unit
• 9 adjustable long-time and short-time pick-up settings allow precise coordination with upstream and downstream protective devices
• Thermal memory function retains thermal state for 20 minutes before and after tripping, preventing premature re-closing
• Local LED signalling indicates device ready status (green flashing), overload at 105% Ir (red), and pre-alarm at 90% Ir (orange)
• Flexible neutral protection options (N/2, full N, or no protection) support multiple network configurations
• Compatible with both ComPact NSX400 and NSX630 new generation circuit breaker frames

Applications:

• Main and sub-main distribution boards in industrial and commercial facilities
• Power distribution panels requiring selective coordination between protective devices
• Electrical systems where precise overload and short-circuit protection settings are required
• 4-wire AC distribution networks up to 690V requiring neutral protection flexibility
• Critical power distribution applications benefiting from pre-alarm signalling before tripping

Compliant with EN/IEC 60947-2 and IEC 60529, IP40 protection per IEC 60529. Part of the Schneider Electric ComPact NSX new generation range.

Also known as: Schneider C4042D250, Schneider Electric C4042D250, MicroLogic 2.3 trip unit NSX400, ComPact NSX electronic protection unit.