Universal Automatic-Electronic Phase Switch PEF-322 is designed to supply industrial and household single-phase loads (230V, 50Hz) from a three-phase four-wire network (3x380V + N).

It ensures uninterrupted power supply for critical single-phase consumers and protects them from unacceptable voltage fluctuations in the network.

Depending on the availability and quality of voltage on the phases, PEF-322 automatically selects the most favorable phase and supplies the single-phase load of any capacity:

• Up to 1.8 kW (8A): The load is powered directly by PEF-322.
• Above 1.8 kW (8A): The device controls the coils of magnetic starters (contactors) with the appropriate power capacity (contactors are not included).

PEF-322 also monitors the sticking of the contacts in its internal relays or external magnetic starters.

Advantages:

• Simple configuration
• Compact size (1 module)
• Monitoring of built-in relays and external contactors (anti-sticking protection)
• Compatibility with contactors for connecting high-power equipment

Applications:

• Supplying single-phase equipment from a three-phase network (e.g., video surveillance systems, alarms, network devices, industrial automation tools, household electronics, etc.).

Key Features:

• Monitoring the quality of voltage in the three-phase network
• Automatic selection of the operating phase
• Connection of single-phase consumers using built-in relays (up to 1.8 kW) or through contactors (above 1.8 kW)
• Monitoring the functionality of built-in relays and external contactors (protection against “sticking” of contacts)
• Automatic return to the priority phase