Schneider C2542D250 ComPacT NSX250 Trip Unit 4P 250 A MicroLogic 2

The Schneider Electric C2542D250 is the MicroLogic 2.2 electronic trip unit for ComPacT NSX250 4-pole circuit breakers, delivering LSoI protection (long-time, short-time, and instantaneous) for low-voltage electrical energy distribution. Rated at 250 A at 40°C on AC networks up to 690 V, the adjustable long-time pick-up covers 100 to 250 A across 9 selectable settings.

Technical specifications:

• Commercial reference: C2542D250
• Manufacturer: Schneider Electric
• EAN:
• Series / range: ComPacT NSX100...250 new generation
• Trip unit name: MicroLogic 2.2
• Trip unit technology: Electronic
• Compatible frame: ComPacT NSX250 new generation
• Application: Electrical energy distribution
• Number of poles: 4P
• Protected poles: 3d + N/2 / 4d / 3d
• Neutral conductor position: Left
• Trip unit function: LSoI
• Protection types: L (long-time overload), So (short-time short-circuit with fixed delay), I (instantaneous short-circuit)
• Trip unit rating: 250 A at 40°C
• Rated voltage [Ue]: 690 V AC
• Network type / frequency: AC, 50/60 Hz
• Mounting mode: Fixed
• Long-time pick-up Ir: Adjustable, 9 settings, 100...250 A
• Long-time delay tr: Fixed - 11 s at 7.2 x Ir; 16 s at 6 x Ir; 400 s at 1.5 x Ir
• Short-time pick-up Isd: Adjustable, 9 settings, 1.5...10 x Ir
• Short-time delay tsd: Fixed
• Instantaneous pick-up Ii: Fixed, 3000 A
• Neutral protection: 0.5 x Ir (3d + N/2), 1 x Ir (4d), none (3d)
• Thermal memory: 20 minutes before and after tripping
• Differential protection: None
• Zone selective interlocking (ZSI): None
• Local signaling: Green LED (device ready), orange LED (90% Ir overload), red LED (105% Ir overload)
• IP protection: IP40 per IEC 60529
• Operating temperature: -25...70°C
• Storage temperature: -50...85°C
• Pollution degree: 3 per IEC 60947-1
• Electric shock protection class: Class II
• Standard: EN/IEC 60947-2
• Weight: 563.7 g

Features and benefits:

• Nine-step adjustable Ir (100-250 A) enables precise overcurrent coordination across diverse load profiles.
• LSoI protection addresses long-time overloads, delayed short-circuit faults, and instantaneous short-circuit events in a single unit.
• 20-minute thermal memory tracks conductor heat buildup before and after tripping, reducing nuisance trips on consecutive overloads.
• Three-color LED signaling (green/orange/red) provides immediate panel-status visibility without additional instrumentation.
• Selectable neutral protection modes (0.5 x Ir, 1 x Ir, or unprotected) accommodate different earthing system arrangements.

Applications:

• Main and sub-main protection in low-voltage distribution boards and switchgear assemblies.
• Industrial power distribution panels requiring selective coordination between upstream and downstream protective devices.
• Commercial and industrial facilities needing 4-pole protection with configurable neutral supervision.
• Generator and UPS output circuit protection in critical power infrastructure.

Compliant with EN/IEC 60947-2, pollution degree 3 per IEC 60947-1. Part of the Schneider Electric ComPacT NSX new generation range.

Also known as: Schneider C2542D250, Schneider Electric C2542D250, MicroLogic 2.2 trip unit 250A, ComPacT NSX250 electronic trip unit.