MZ21 PTC Thermistor 15P 100Ω ±25% 120°C for AC Circuit Overcurrent Protection in Welding Machines
The MZ21 PTC Thermistor 15P 100Ω ±25% 120°C is designed for overcurrent protection in telecommunication systems and AC circuits, particularly in welding machine applications.
| Parameter | Value |
|---|---|
| Rated Resistance (25°C) | 100Ω ±25% |
| Switch Temperature | 120°C ±7°C |
| Breakdown Voltage (AC) | 600 V |
| Non-Operating Current (at 40°C) | 100 mA |
| Typical Trip Current | 200 mA |
| Operating Temperature Range | -10°C to +45°C |
| Dimension | Value (mm) |
|---|---|
| Maximum Diameter (DMAX) | 15.0 |
| Width (W±1.0) | 5.0 |
| Maximum Thickness (TMAX) | 7.0 |
| Lead Diameter (Φd±0.05) | 0.8 |
The PTC thermistor is connected in series within the load circuit. During normal operation, current remains below the rated level, maintaining low resistance. During circuit faults when current exceeds twice normal levels, the thermistor rapidly heats up, transitioning to a high-resistance state that effectively "switches off" the circuit for protection. Once the fault is resolved, the thermistor automatically returns to low impedance, restoring normal circuit function.
Primarily used in inverter welding machines for reliable overcurrent protection, ensuring long-term operational stability. Compatible with various protection components including varistors, NTC thermistors, and fuses for comprehensive circuit protection solutions.
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