Schneider C253MG250 TM250G Thermal-Magnetic Trip Unit

The C253MG250 Schneider is a TM250G thermal-magnetic trip unit designed for dependable protection in low-voltage power distribution systems. Compatible with ComPacT NSX250 circuit breakers, this unit supports 3-pole configurations and is rated for 250 A at 40 °C.

It features thermal (overload) and magnetic (short-circuit) protection, offering robust and adjustable circuit safeguarding for general distribution applications. This trip unit provides fixed short-time protection, adjustable long-time protection, and ensures compliance with IEC 60947-2 standards, making it suitable for demanding commercial and industrial use.

Technical Specifications

• Model: C253MG250
• Type: TM250G Thermal-Magnetic Trip Unit
• Brand: Schneider Electric
• Range: ComPacT NSX New Generation

Power & Performance

• Rated Current: 250 A at 40°C
• Poles: 3P (Three Poles)
• Protected Poles: 3D
• Trip Unit Technology: Thermal-Magnetic
• Application: Generator Protection
• Protection Functions:
  • L: Overload protection (thermal)
  • I: Short-circuit protection (magnetic)
• Rated Operational Voltage (Ue): 690V AC 50/60Hz / 750V DC
• Network Type: AC / DC
• Network Frequency: 50/60 Hz

Protection Settings

• Long-time (Thermal) Pick-Up Range (Ir): Adjustable from 0.7 to 1 x In
• Thermal Delay (tr): Fixed 120…400 s at 1.5 x In
• Instantaneous (Magnetic) Protection (Ii): Fixed at 520 A

C253MG250 Physical Specifications

• Gross Weight: 473 g

Dimensions:

• Height: 16.0 cm
• Width: 10.0 cm
• Length: 12.0 cm

Environmental Specifications

• Standards: EN/IEC 60947-2
• Shock Protection Class: Class II
• Pollution Degree: 3 (IEC 60947-1)
• IP Degree of Protection: IP40 (IEC 60529)
• Ambient Temperature for Operation: -25°C to +70°C
• Ambient Temperature for Storage: -50°C to +85°C
• Carbon Footprint: 79 kg CO₂-eq (Total Life Cycle)
• Recycled Metal Content: 0%

Key Features & Benefits

✅ Reliable Generator Protection: Adjustable thermal protection and fixed magnetic protection.

✅ Dual AC/DC Capability: Suitable for both AC and DC applications up to 750V DC.

✅ EcoStruxure Ready: Compatible with PowerTag NSX for advanced energy monitoring and analytics.

✅ Compact & Robust: Built for ComPacT NSX250 circuit breakers with excellent environmental resilience.

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