Schneider C254TM250 Trip Unit TM250D, ComPact NSX250, Thermal‑M

The Schneider Electric C254TM250 is a TM250D thermal-magnetic trip unit designed for the ComPact NSX250 circuit breaker, rated at 250A with 4-pole 4D configuration (fully protected neutral). It provides thermal overload and short-circuit protection for AC power distribution applications.

Technical specifications:

• Commercial reference: C254TM250
• Manufacturer: Schneider Electric
• EAN:
• Series / range: ComPact NSX100...250 new generation
• Product type: Trip unit
• Trip unit name: TM-D
• Trip unit technology: Thermal-magnetic
• Compatible product range: ComPact new generation NSX250
• Number of poles: 4P
• Protected poles description: 4D (fully protected neutral)
• 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
• Mounting mode: Fixed
• Long-time pick-up adjustment [Ir]: Adjustable, 0.7...1 x In
• Long-time delay [tr]: Fixed, 120...400 s at 1.5 x In / 15 s at 6 x Ir
• Neutral protection setting: 1 x Ir (4D)
• Instantaneous pick-up adjustment [Ii]: Adjustable, 5...10 x In
• Differential protection: None
• 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
• Package weight: 592 g

Features and benefits:

• Thermal-magnetic protection covers both overload (L) and short-circuit (I) functions in a single trip unit
• Adjustable long-time pick-up (Ir) from 0.7 to 1 x In allows fine-tuning to the load requirements
• Fully protected neutral (4D configuration) ensures complete protection on all four poles including the neutral conductor
• Wide operating temperature range of -25...70°C suits demanding industrial environments
• IP40 protection rating guards against solid particle ingress in panel installations
• Compliant with EN/IEC 60947-2, meeting international standards for low-voltage switchgear

Applications:

• Main and sub-main protection in industrial and commercial power distribution panels
• Protection of feeders and outgoing circuits in LV switchboards
• Applications requiring full neutral protection in 4-pole systems
• Industrial installations where adjustable overload and short-circuit settings are required

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

Also known as: Schneider C254TM250, Schneider Electric C254TM250, NSX250 trip unit, TM-D thermal-magnetic trip unit.