Voltage, symmetry and phase sequence control relay RNPP-311M NTRNP311M

Intelligent protection of three-phase electrical installations

The RNPP-311M voltage control, symmetry and phase sequence relay is an advanced device designed for comprehensive protection of three-phase electrical installations. It provides reliable operation in the event of incorrect voltage parameters, protecting connected devices from damage and downtime. The device is particularly useful in industrial applications, but will also work well in commercial buildings and homes with extensive electrical installations.

Functions and capabilities

RNPP-311M offers a wide range of protective functions, including:

• Control of permissible voltage level: monitors minimum and maximum voltage values, disconnecting the load if the set thresholds are exceeded.
• Phase sequence and phase failure control: prevents damage to equipment caused by incorrect phase sequence or a break in one of the phases.
• Voltage symmetry control (phase imbalance): detects asymmetry of interphase voltages, which can lead to overheating of motors and other equipment.
• Automatic restart (AR): after the correct voltage parameters are restored, the device automatically switches on the load after a specified time, minimizing downtime.
• Earthing control: indirect method of controlling the correctness of connection to earth.
• Fault indication: informs about the occurrence of a problem via a light signal on the front panel.
• Versatility: possibility to choose the network voltage (400 V or 415 V) and configure the set of protective functions.

Flexibility and adaptation to needs

The RNPP-311M relay offers wide configuration possibilities, allowing you to adapt its operation to the specific requirements of the installation. The user can adjust:

• Voltage trigger thresholds (minimum and maximum).
• AR time (automatic restart).
• Delay time of protection operation.
• Selection of the device operating mode – full network parameter control, minimum/maximum voltage control, phase presence control, phase sequence and asymmetry control, and other combinations.

Thanks to this, the RNPP-311M can be used in various applications and provides optimal protection for different types of loads. The device reacts to phase failure or voltage drop below 100 V within 0.2 s in all operating modes.

Mounting and application

The RNPP-311M relay is mounted on a DIN rail, which facilitates its installation in electrical switchboards. LED signaling informs about the device's operating status and any failures. The relay is used wherever reliable protection of three-phase electrical installations is required – in industry, commercial construction and in homes with extensive electrical installations. The device is compatible with contactors, which increases safety of use.