Modular | digital voltage and current monitoring | protection | phase sequence imbalance relay | 3-phase | 1-63A | 380V | DIN rail

Modular digital voltage and current monitoring relay – 3-phase, 1-63A, 380V, DIN, phase sequence and imbalance protection

Modular three-phase voltage and current protection relay – an advanced device designed to monitor the electrical network condition and automatically disconnect the load when dangerous parameters occur: over-voltage, under-voltage, over-current, phase loss, phase imbalance or incorrect phase sequence.

• Adjustable over-voltage protection – disconnects the load when the voltage exceeds the set limit.
• Adjustable under-voltage protection – protects equipment from operating at too low network voltage.
• Adjustable over-current protection – allows the current limit to be set according to the load.
• Phase asymmetry protection – disconnects the load when the phase voltage difference becomes too large.
• Phase sequence protection – helps protect motors and other equipment from incorrect phase sequence.
• Phase loss protection – disconnects the load when one of the phases is missing.
• Automatic recovery – the relay can restore operation after the set delay when parameters return to normal.
• Real-time phase voltage display – L1, L2 and L3 status can be monitored on the display.

• Electrical panels – for three-phase input protection against over-voltage, under-voltage and overloads.
• Industrial equipment – for protection of motors, pumps, compressors, fans and other loads.
• Household three-phase systems – for homes or homesteads with three-phase electrical input.
• Commercial facilities – for shops, workshops, warehouses and technical rooms.
• Generator and UPS systems – for voltage stability monitoring and safe disconnection.
• Solar power systems – for network parameter monitoring and protective disconnection.

For household users: suitable for protecting a home three-phase input when you want to protect household appliances, heating equipment, pumps or other three-phase devices from network faults.

For companies and industry: helps protect motors, compressors, pumps, production equipment and other sensitive devices from phase loss, over-voltage, under-voltage and overload.

For engineers / designers: a suitable solution when the project requires adjustable three-phase protection with over-voltage, under-voltage, over-current, phase sequence and imbalance functions.

For electricians: mounted on a DIN rail, with clear parameter settings, allowing convenient adjustment of protection limits according to the specific system.

In practice, this relay is installed in an electrical panel and connected to the three-phase input or to the specific protected load. It monitors L1, L2 and L3 phase voltages, controls over-current and disconnects the load when network parameters become unsafe.

This is especially important for motors, pumps and compressors, because incorrect phase sequence, phase loss or voltage imbalance can cause incorrect rotation direction, overheating or equipment failure.

The relay must be installed according to the specific electrical system diagram. Before installation, it is important to determine whether the version with N wire or without N wire is being used, and to correctly select current, voltage and recovery limits.

• Install only with power disconnected.
• Installation must be performed by a qualified specialist.
• Check whether the network is 3 x 230V + N or 3-phase 380V without N.
• Correctly set over-voltage and under-voltage limits.
• Correctly set the current limit according to the load.
• For motors, check the phase sequence to avoid incorrect rotation direction.
• The relay does not replace a circuit breaker or residual current device, therefore all necessary protections must be used in the panel.

Quick selection guide

Choose the modular three-phase voltage and current monitoring relay when you need over-voltage, under-voltage, over-current, phase loss, phase sequence and imbalance protection in one device.

Three-phase voltage, current, phase sequence and imbalance protection relay

The modular digital voltage and current monitoring relay 3F 1-63A 380V DIN is a professional solution for protecting three-phase electrical systems against over-voltage, under-voltage, over-current, phase loss, phase sequence error and phase imbalance.

With adjustable limits, automatic recovery, real-time voltage display, DIN mounting and wide application, this relay is suitable for electrical panels, industrial equipment, motors, pumps, generators, UPS, solar power systems and other three-phase systems where reliable and flexible protection is required.