Pollin MKF-12PK Phase Failure, Asymmetry and Sequence Monitoring Relay 2x1P 8A 250V TH35

The Pollin MKF-12PK is a professional monitoring relay engineered to safeguard three-phase electrical systems from critical power supply irregularities. By continuously monitoring for phase failure, phase asymmetry, and incorrect phase sequence, this device acts as a vital protective layer for sensitive industrial and residential equipment. Designed for standard TH35 DIN rail mounting, it integrates seamlessly into modern electrical cabinets, providing a reliable solution for maintaining operational stability and preventing costly hardware damage.

Advantages

This monitoring relay offers robust protection by detecting deviations in power quality before they can cause motor burnout or control system malfunctions. Its dual-output configuration provides flexibility in circuit design, while the high-precision sensing technology ensures that the system reacts promptly to phase loss or voltage imbalances. The compact design and standardized mounting make it an efficient choice for both new installations and retrofitting existing electrical panels, ensuring long-term reliability and reduced maintenance requirements for three-phase machinery.

Suitable for

• Three-phase motor protection
• Industrial automation systems
• HVAC control panels
• Residential power distribution boards
• Pump and compressor control circuits

This device may not be suitable for single-phase electrical systems or applications requiring specialized monitoring functions such as overvoltage or undervoltage protection beyond phase-specific parameters. It is also not intended for use in environments with extreme moisture or corrosive gases without appropriate protective enclosure housing.

Key specifications

• Monitoring functions: Phase failure, phase asymmetry, phase sequence
• Output configuration: 2x1P (two independent changeover contacts)
• Contact rating: 8A at 250V AC
• Mounting type: TH35 DIN rail
• Application: Three-phase systems

Installation should be performed by a qualified professional in accordance with local electrical regulations. The relay is mounted directly onto a standard TH35 rail within a distribution board. Connect the three-phase supply lines to the designated input terminals and wire the output contacts into the control circuit of the equipment being protected. Ensure that all connections are tightened securely and that the wiring matches the provided technical diagram to prevent short circuits or improper operation.

What to consider before purchase

• Verify that your electrical system is a three-phase configuration
• Ensure the load current does not exceed the 8A contact rating
• Check available space on the DIN rail within your enclosure
• Confirm compatibility with your existing control voltage requirements

For optimal performance and safety, regularly inspect the terminal connections for tightness and ensure the device is kept free from dust and debris. If the relay triggers a shutdown, verify the incoming power supply quality before attempting a reset to ensure the underlying electrical fault has been resolved.