K-ELECTRIC 103066 Adjustable Undervoltage Monitoring Relay, 2 Changeover Contacts, 20-280 V AC/DC

This monitoring relay stands out by offering a self-powered design that draws its supply directly from the measured voltage, eliminating the need for an auxiliary power source. With adjustable threshold, hysteresis, and time delays, it provides flexible undervoltage protection for a wide range of AC and DC systems.

Highlights

• Adjustable undervoltage threshold from 20 to 280 V AC/DC
• Two changeover contacts for control and signaling
• Self-powered from the measuring voltage — no separate supply needed
• DIN rail mounting with a compact 2 TE (35 mm) width

In daily use

The K-ELECTRIC 103066 continuously monitors the voltage in your installation. When the voltage drops below the set threshold, the relay de-energizes after the configured delay, protecting sensitive equipment from undervoltage conditions. Hysteresis prevents rapid switching around the threshold, and independent ON/OFF delays allow fine-tuning for your application.

Full specifications

• Product type: Undervoltage monitoring relay
• Measuring voltage range: 20 - 280 V AC/DC
• Threshold adjustment range: 20 - 280 V AC/DC
• Hysteresis adjustment: 5 - 50% of set value
• Time delay adjustment: 0.1 - 10 s (t_on and t_off)
• Output contacts: 2 changeover (2 NO/NC)
• Contact switching capacity: 250 V AC / 5 A (resistive load)
• Mounting: DIN rail (35 mm), width 2 TE (35 mm)
• Connection: Screw terminals
• Operating temperature: -20 to +50 °C
• LED indicators: Power, relay status, undervoltage

Final note

Ideal for protecting motors, control circuits, and automation systems against undervoltage without the need for an external power supply.