The 19P MZ21-P101RNM PTC thermistor is a specialized 19mm diameter, 100Ω current limiting component designed specifically for welding machine overload protection. This 0.5W rated thermistor provides automatic circuit protection with recoverability and reusable operation.

Under normal operating conditions with current below the rated 180mA, the PTC thermistor maintains low resistance and minimal impact on circuit performance. During fault conditions with excessive current, the component rapidly heats up, transitioning to high resistance state to interrupt the circuit. Once the fault is cleared, it automatically returns to low resistance state, restoring normal operation.

• Automatic circuit protection with steady recovery
• Contactless, noiseless, and flameless operation
• Fast response time to overcurrent conditions
• Superior overvoltage protection performance
• Wide operating voltage range capability
• Small steady-state resistance
• Compact 19mm size with minimal footprint
• Long-term stability and reliability
• No reset required after overload protection activation
• RoHS compliant for environmental safety

Specifically designed for inverter welding machines, this PTC thermistor provides essential overcurrent protection to ensure long-term reliable operation. It complements complete protection systems including varistors, NTC thermistors, and fuses for comprehensive circuit safety.