Three-phase control relay with PTC control of phase disconnection/asymmetry/sequence

Three-phase phase control relay with disconnection protection and coil temperature control, TENSE - FKV-14P

Product Description

The three-phase phase control relay FKV-14P is designed to protect three-phase electric motors and equipment from critical faults in the power supply network. It provides comprehensive monitoring of phase presence, phase failures, phase disturbances, asymmetry (fixed at 40%), incorrect phase sequence, and excessive temperature of the motor coil. It is equipped with a neutral wire and is intended for DIN rail mounting.

Main Features

• Checks the presence of all three phases

• Phase failure protection

• Detection of phase disturbance (folding)

• Control of fixed voltage asymmetry at 40%

• Protection against incorrect phase sequence

• Control of motor coil temperature

• Optical status indication (LED OUT)

• Automatic restoration of operation when parameters return to allowable range

Operating Principle

• Normal operation: if all three network voltages are present, the phase sequence is correct, and the coil temperature does not exceed allowable values, the relay activates (contacts 15-18 are closed) and the OUT LED lights up.

• Voltage error or asymmetry: if the voltage of any phase deviates by more than 40%, contacts 15-18 open and contacts 15-16 close; the OUT LED does not light.

• Phase sequence error: the relay responds by opening the contacts and turning off the OUT LED.

• Coil temperature exceeding limit: the relay switches off the output until the temperature returns to allowable limits.

• Operation restoration: the relay automatically returns to operating state after parameters normalize.

Technical Specifications

• Device type: phase monitoring relay

• Number of phases: 3 + N

• Asymmetry: 40% (fixed)

• Coil temperature protection: Yes

• Output contacts: 15-18 (closed during operation), 15-16 (closed during fault)

• Indication: LED OUT

• Mounting: DIN rail

• Manufacturer: TENSE (Turkey)

Advantages

• Comprehensive protection of the motor and wiring

• Stable operation thanks to fixed 40% asymmetry

• Easy DIN rail mounting

• Automatic function restoration without operator intervention

• Reliable protection under harsh industrial conditions

Typical Applications

• Three-phase electric motors

• Industrial pumping systems

• Compressors

• Fans

• Machines sensitive to phase sequence and voltage quality