Modular | Digital | Multifunctional Overvoltage, Phase Sequence and Phase Imbalance Relay | 3-Phase to 1-Phase | 63A | 230V | DIN Rail | TOMZN

Modular Automatic Phase Switching and Imbalance Relay – 3P+N, 230V, 63A, DIN Rail, with Voltage and Current Monitoring

The modular automatic phase switching and imbalance relay is designed to supply a single-phase 230V AC load from a three-phase 3P+N electrical network. The device continuously monitors the voltage of all three phases, L1, L2 and L3, and automatically selects a suitable phase to supply the single-phase load.

• the voltages of all three phases, L1, L2 and L3;
• which phase is currently supplying power;
• the load current of the selected phase in amperes;
• whether the phase voltages are within the configured permissible limits.

• Automatic selection of a suitable phase from L1, L2 or L3.
• Real-time monitoring of all three phase voltages.
• Display of L1, L2 and L3 voltages in volts.
• Selected phase indication using a separate indicator light.
• Display of the active phase load current in amperes.
• Single-phase 230V AC output for single-phase electrical consumers.
• Adjustable overvoltage protection.
• Adjustable undervoltage protection.
• Adjustable overcurrent protection.
• Automatic load disconnection when electrical network parameters are unsuitable.
• Adjustable switch-on and reconnection delay.
• Parameter configuration using control buttons.
• Modular installation on a DIN rail.

• Private homes – to improve the reliability of the power supply to important single-phase electrical circuits.
• Offices and commercial premises – to supply single-phase consumers from a three-phase electrical connection.
• Security and communication systems – for alarm systems, video surveillance and communication equipment.
• Heating and ventilation automation – for controllers, circulation equipment and other single-phase devices.
• Refrigeration equipment – for single-phase consumers within refrigeration systems.
• Single-phase pumps – when the pump power supply must be selected from the phases of a three-phase network.
• Gate and alarm systems – for automation and drive control circuits.
• Other single-phase 230V loads – where a three-phase 3P+N electrical network is available.

Automatic Phase Selection for a More Reliable Single-Phase Power Supply

The modular automatic phase switching and imbalance relay, 3P+N, 230V, 63A, is designed for buildings with a three-phase electrical connection where important equipment must be supplied with single-phase 230V power.

The device monitors the L1, L2 and L3 voltages in real time, displays the voltages of all three phases, shows the load current of the selected phase in amperes and uses an indicator light to show which phase is currently active.

If the active phase fails or its voltage exceeds the configured limits, the load is disconnected and the device can automatically select another suitable phase according to the configured operating algorithm. It is a practical solution for homes, offices, security systems, heating and ventilation automation, refrigeration equipment, pumps and other single-phase 230V loads.