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Virtually zero heat generation compared to diodes.
No blown fuses to replace; the PTC resets once the short is fixed.
While the MOSFET stays cool, the PTC will get hot during a fault—keep it away from heat-sensitive components like electrolytic caps. To help you select the specific components, tell me: Your input voltage range? The maximum current your device pulls? Virtually zero heat generation compared to diodes
The Gate is pulled low relative to the Source, allowing current to flow freely to the load.
Acts as the main switch for reverse polarity protection. To help you select the specific components, tell
Provides simple, low-cost over-current protection.
If current exceeds the limit, the PTC heats up rapidly, its resistance spikes, and it effectively "opens" the circuit until the fault is removed and it cools down. 📐 Circuit Design Value/Part No. Q1 P-Channel MOSFET Reverse Polarity Switch F1 PTC Resettable Fuse Over-current Protection D1 10V - 15V Zener Gate Over-voltage Protection R1 10kΩ - 100kΩ Gate Pull-down 💡 Key Advantages Acts as the main switch for reverse polarity protection
Ensures the MOSFET stays "OFF" when no power is applied. ⚡ How It Works 1. Reverse Polarity Protection