K-ELECTRIC 103067 Single-Phase Voltage Monitoring Relay, 230 V AC, Under/Overvoltage, 1 CO Contact, DIN Rail

Voltage fluctuations can damage sensitive electrical equipment or cause unexpected downtime. The K-ELECTRIC 103067 is a single-phase voltage monitoring relay that protects against both under- and overvoltage conditions. It continuously monitors the supply voltage and switches its output contact when the voltage deviates from the adjustable threshold, helping to prevent equipment failure and reduce maintenance costs.

Who is it for

This relay is intended for electricians, panel builders, and maintenance technicians who need reliable voltage supervision in industrial control panels, HVAC systems, or building automation. It is suitable for protecting motors, compressors, and other single-phase loads from harmful voltage levels.

Main features

• Monitors single-phase AC voltage for under- and overvoltage
• Adjustable monitoring range: 80% to 120% of nominal voltage (0.8–1.2 U_N)
• Nominal supply voltage: 230 V AC, 50/60 Hz
• Output: 1 changeover contact (SPDT), rated 5 A at 250 V AC resistive
• Adjustable response delay time: 0.1 to 10 seconds
• Fixed hysteresis of 5% to prevent relay chatter
• LED status indication
• DIN rail mounting, width 22.5 mm
• Screw terminals for secure wiring

Specifications

• Product type: Voltage monitoring relay
• Monitoring function: Under- and overvoltage
• Number of phases: Single-phase
• Nominal supply voltage: 230 V AC
• Operating frequency: 50/60 Hz
• Monitoring range: 80% to 120% of nominal voltage
• Output contact: 1 changeover (SPDT)
• Contact rating: 5 A at 250 V AC (resistive)
• Hysteresis: 5%
• Response delay: 0.1–10 s adjustable
• Mounting: DIN rail
• Housing width: 22.5 mm
• Terminal type: Screw terminals
• Operating temperature: -20 to +55 °C
• Storage temperature: -40 to +70 °C
• Protection class housing: IP40
• Protection class terminals: IP20
• Status indication: LED
• Reset type: Automatic

Tips

Set the response delay longer than any expected brief voltage dips to avoid nuisance tripping. The 5% hysteresis prevents rapid switching when the voltage hovers near the threshold.