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Siemens 3UN2100-0AN7 PTC Thermistor Tripping Unit

  • Siemens 3UN2100-0AN7 PTC Thermistor Tripping Unit
  • Siemens 3UN2100-0AN7 PTC Thermistor Tripping Unit
  • Siemens 3UN2100-0AN7 PTC Thermistor Tripping Unit
  • Siemens 3UN2100-0AN7 PTC Thermistor Tripping Unit
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Siemens 3UN2100-0AN7 PTC Thermistor Tripping Unit

€110,00
€110,00
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Siemens 3UN2100-0AN7 PTC Thermistor Tripping Unit Siemens 3UN2100-0AN7 PTC Thermistor Tripping Unit Siemens 3UN2100-0AN7 PTC Thermistor Tripping Unit Siemens 3UN2100-0AN7 PTC Thermistor Tripping Unit

Siemens 3UN2100-0AN7 PTC Thermistor Tripping Unit

Motor overtemperature protection relay with 1NO/1NC output and auto reset

Overview

The Siemens 3UN2100-0AN7 is a high-performance protection device designed to monitor temperature variations in motor circuits, helping prevent overheating and equipment failure. It utilizes PTC thermistor technology to deliver precise thermal monitoring and trigger a trip response in case of excessive temperatures, enhancing motor lifespan and operational safety. The unit features increased interference suppression, IP20 protection, monostable auto-reset operation with 2 LEDs, and 1NO+1NC contact outputs, operating on 220-240VAC at 50/60Hz. This part is discontinued by the manufacturer but remains widely used and supported for legacy motor protection systems.

Key Features

  • PTC thermistor sensing: Precise thermal monitoring for early detection of motor overheating conditions.
  • 1NO+1NC contact configuration: Flexible control options for integration into motor protection circuits.
  • Auto reset: Automatically resets once the monitored temperature returns to a safe range, reducing manual intervention.
  • Increased interference suppression: Enhanced immunity to electrical noise for reliable operation in industrial environments.
  • Dual LED status indication: Two LEDs provide clear visual status feedback.
  • IP20 protection: Suitable for standard control panel installation.

What's Included

Item Function Qty
Siemens 3UN2100-0AN7 Tripping Unit PTC thermistor motor protection relay 1

Brand: Siemens | Model: 3UN2100-0AN7

Note: mounting hardware and wiring not included unless otherwise stated. Please confirm condition and testing status before purchase.

Technical Specifications

Supply voltage: 220/240V.

Frequency: 50/60 Hz.

Contact rating: 220V AC 3A; 24V DC 3A.

Compatibility & Applications

This tripping unit is well suited for motor protection applications requiring thermal overload monitoring via PTC thermistor sensors embedded in motor windings. Though discontinued by Siemens, it's still commonly used as a replacement or maintenance part for legacy motor control panels and industrial equipment relying on this relay for overtemperature protection.

A1Customer — Industrial Automation Equipment | Tampere, Finland
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