Schneider C4042D400 ComPacT NSX400 Trip Unit 4P 400 A MicroLogic 2

The Schneider Electric C4042D400 is the MicroLogic 2.3 electronic trip unit for ComPacT NSX400 and NSX630 new-generation circuit breakers. This 4-pole unit provides LSoI protection - long-time overload, short-time short-circuit with fixed delay, and instantaneous - with a 400 A rating at 40°C on 690 V AC networks.

Technical specifications:

• Commercial reference: C4042D400
• Manufacturer: Schneider Electric
• EAN:
• Series: ComPacT NSX new generation
• Trip unit name: MicroLogic 2.3
• Technology: Electronic
• Number of poles: 4P
• Protection function: LSoI
• Trip unit rating: 400 A at 40°C
• Rated voltage: 690 V AC, 50/60 Hz
• Compatible circuit breakers: ComPacT NSX400 and NSX630 (new generation)
• Long-time pick-up (Ir): adjustable, 9 settings, 160-400 A
• Long-time delay (tr): fixed - 11 s at 7.2xIr, 16 s at 6xIr, 400 s at 1.5xIr
• Short-time pick-up (Isd): adjustable, 9 settings, 1.5-10xIr
• Short-time delay (tsd): fixed
• Instantaneous pick-up (Ii): fixed, 4800 A
• Thermal memory: 20 minutes
• IP rating: IP40 (IEC 60529)
• Pollution degree: 3 (IEC 60947-1)
• Electrical protection class: Class II
• Operating temperature: -25 to 70°C
• Storage temperature: -50 to 85°C
• Standard: EN/IEC 60947-2

Features and benefits:

• LSoI protection combines long-time overload (L), short-time short-circuit with fixed delay (So), and instantaneous short-circuit (I) in a single electronic unit
• Adjustable Ir with 9 settings (160-400 A) and adjustable Isd with 9 settings (1.5-10xIr) for flexible protection coordination
• 20-minute thermal memory retains thermal state before and after tripping, reducing the risk of nuisance re-tripping
• Three-level LED local signalling: green blinking (device ready), orange (overload at 90% Ir), red (overload at 105% Ir)

Applications:

• Main and sub-main power distribution switchboards in industrial and commercial facilities
• High-current feeder circuits requiring selective protection coordination between upstream and downstream devices
• Electrical power distribution systems demanding adjustable overload and short-circuit protection settings

Compliant with EN/IEC 60947-2. Part of the Schneider Electric ComPacT NSX new-generation range.

Also known as: Schneider C4042D400, Schneider Electric C4042D400, MicroLogic 2.3 trip unit NSX400, ComPacT NSX400 electronic trip unit.