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Key Points: Self-Recovering Over/Under Voltage Protector (OUPA) Installation Guide I. Pre-Installation Preparation Model Selection and Parameter Confirmation For household single-phase circuits, choose the 2-pole (1P+N) type; for three-phase circuits, choose the 4-pole (3P+N) type. The rated voltage must match household power distribution (230V single-phase / 400V three-phase), and the current rating must be ≥ the rated current of the main switch. Choose an integrated design with DIN rail mounting—no additional operating handle required. Tools and Safety Preparation Turn off the main power supply and verify de-energization with a voltage tester.
Model Selection and Parameter Confirmation
For household single-phase circuits, select the two-pole (1P+N) model; for three-phase circuits, select the four-pole (3P+N) model. The rated voltage must match the household distribution (230V single-phase / 400V three-phase), and the current rating must be ≥ the rated current of the main breaker
Select a one-piece structure with DIN rail mounting; no additional operating handle is required
Tools and Safety Preparation
Turn off the main power supply and verify with a voltage tester that no voltage is present before working, to avoid the risk of electric shock
Secure the Protector
Snap the protector onto the DIN rail
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