Schneider C164TM125 Trip Unit TM125D

The C164TM125 Schneider is a TM125D thermal-magnetic trip unit designed for dependable protection in low-voltage power distribution systems. Compatible with ComPacT NSX160 and NSX250 circuit breakers, this unit supports 4-pole configurations and is rated for 125 A at 40 °C.

It features adjustable thermal overload protection (0.7–1×In) and fixed magnetic short-circuit protection (10×In), ensuring robust defense against electrical faults. The unit’s 4D configuration provides full neutral protection, making it ideal for generator and backup power applications. Compliant with IEC 60947-2 standards, it delivers reliable performance in demanding environments.

Technical Specifications

• Model: C164TM125
• Type: Thermal Magnetic Trip Unit TM125D
• Brand: Schneider Electric
• Range: ComPacT NSX New Generation

Power & Performance

• Rated Current: 125 A at 40°C
• Poles: 4P (Four Poles)
• Protected Poles: 4D (Four Protected Poles)
• Trip Unit Technology: Thermal-Magnetic
• Protection Functions:
  • L (Thermal): Overload Protection
  • I (Magnetic): Short-Circuit Protection
• Rated Operational Voltage (Ue):
  • 690V AC 50/60Hz
• Network Type: AC
• Network Frequency: 50/60 Hz

Adjustments & Settings

• Long-Time Thermal Protection (Ir): Adjustable
• Adjustment Range: 0.7…1 x In
• Long-Time Delay (tr): Fixed
• Delay Settings:
  • 120…400 seconds at 1.5 x In
  • 15 seconds at 6 x Ir
• Instantaneous Magnetic Protection (Ii): Fixed
• Instantaneous Setting: 1250 A
• Earth Leakage Protection: Not included

Build & Design

• Mounting Mode: Fixed
• Trip Unit Rating: 125A
• Compatibility:
  • ComPacT NSX160 Basic Frames
  • ComPacT NSX250 Basic Frames

C164TM125 Physical Specifications

• Gross Weight: 514 g

Dimensions:

• Height: 6.5 cm
• Width: 9.5 cm
• Length: 15.0 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: 100 kg CO₂-eq (Total Life Cycle)
• Recycled Metal Content: 0%

Key Features & Benefits

✅ Thermal-Magnetic Protection: Ensures reliable overload and short-circuit protection.

✅ Adjustable Thermal Settings: Tailor protection to your system requirements with adjustable long-time pick-up.

✅ Fixed Magnetic Protection: Pre-set for fast reaction to short-circuit events.

✅ Durable Design: Rated for harsh environments with a wide operating temperature range.

✅ Seamless Integration: Specifically designed for use with ComPacT NSX160 and NSX250 circuit breakers and EcoStruxure Power systems.

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