Description
ABB C108.02 Thermistor Control Unit
PTC Motor Protection Relay — VDE 0435 / C250 Compliant
This genuine ABB/BBC control unit is in fully tested, working used condition. It has been successfully powered up and bench tested to ensure the internal switching contacts respond accurately to simulated PTC thermistor resistance changes. The casing, DIN-rail latching mechanism, and wiring terminals are fully intact and ready for immediate deployment.
Product Overview
The ABB C108.02 (GHC108.02) is a high-reliability thermistor control unit engineered specifically for motor and heavy machinery protection loops. By monitoring the resistance values of positive temperature coefficient (PTC) thermistors embedded directly within the motor windings, this relay acts as a defensive shield against overheating caused by overload, phase failure, or cooling blockages.
Compliant with stringent **VDE 0435 / C250** standards, this module is built to withstand hazardous voltage surges and heavy vibration in industrial panels. The front panel features a manual reset button alongside dual LED status lights, providing instant on-site diagnostics of power supply status and trip faults.
Technical Specifications
| Specification Parameter | Details |
|---|---|
| Brand / Manufacturer | ABB (formerly BBC – Brown Boveri & Cie) |
| Model / Part Number | C108.02 (GHC108.02 / GHC1080201R0002) |
| Control Type | PTC Thermistor Relay / Thermal Protection Control |
| Safety Standard Compliance | VDE 0435 / Insulation Group C250 |
| Control Voltage (Uc) | 230V AC (Nominal) |
| Relay Outputs / Rating | AC-15: 2A / 250V (General rating: up to 5A 250V AC) |
| Indicators & Interface | Power “Netz” LED (Green), Fault “Störung” LED (Red), Manual Reset Button |
| Mounting Profile | Standard 35mm DIN Rail Mount |
Key Features
- Thermal-Memory Protection: Automatically senses temperature spikes directly in the windings of electric motors, tripping before the winding insulation degrades.
- VDE 0435 Ruggedized Certification: Specifically engineered to isolate electrical noise and withstand severe transient spikes inside industrial motor starter cabinets.
- Simple Operator Diagnostics: High-visibility LEDs clearly distinguish between normal operation and active faults, speeding up line diagnostic times.
- Convenient Manual Reset: Integrated front panel reset push button lets operators quickly reset control loops once windings cool down to safe ranges.

