Phase Control Relay RКF-3 is an electronic device designed to protect three-phase equipment from critical conditions in the power network.

🧩 Functional Features

• Phase loss detection: identifies the absence of one or more phases
• Phase sequence monitoring: prevents incorrect phase connection
• Phase imbalance detection: monitors voltage asymmetry
• Overvoltage and undervoltage protection: safeguards equipment when voltage goes beyond preset limits
• Adjustable trip thresholds: allows configuration of upper and lower voltage limits
• Adjustable trip delay time: enables setting of delay time before the relay activates
• One alarm output: relay-type, ~230 V, 8 A

🎯 Purpose:
The MZ-694 is designed to protect against surge overvoltages and electromagnetic interference in the following systems:

• 📡 data transmission,
• ⚙️ control and monitoring,
• 📊 measurement,
• 🔌 low-voltage power supply.

The device provides reliable protection of sensitive equipment against overvoltages caused by:

• lightning discharges,
• switching processes in power networks,
• industrial interference.

🔧 Technical Specifications:

• ⚡ Nominal voltage: for low-voltage circuits.
• 🔒 Operating principle: limiting overvoltages to a safe level using varistors, gas discharge elements, and filtering circuits.
• ⏱ Response time: 1 µs (instantaneous response).
• 📏 Protection level: galvanic isolation of signals from interference.
• 🌡 Operating temperature range: from −40 °C to +70 °C.
• 🛠 Design: compact DIN-rail mountable module.

💡 Functional Features:

• 🛡 Protection against lightning surges and transient overvoltages.
• 🔄 Suppression of high-frequency and switching interference.
• ⚡ Preservation of integrity and reliability of signals in communication and control lines.
• 📊 Increased reliability of measurement and control systems.
• 🔌 Protection of low-voltage power supplies against damage.
• 🌐 Application in industrial automation systems (ACS TP), telemetry, energy, and communication systems.