Positive pressure type "p" is an explosion-proof protection type that maintains the pressure of the protective gas inside the casing higher than the external pressure to prevent external explosive environments from entering the casing.
Advantages of positive pressure explosion-proof:
1. Reduce the temperature rise of the device itself
2. Lower requirements for equipment weight, size, etc
3. The shell only has IP requirements
4. The electrical equipment in the positive pressure chamber does not require explosion-proof type, with a wider selection
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