K-ELECTRIC 103061 Undervoltage Monitoring Relay with Phase Sequence Detection, 3 x 400V AC, 1 CO Contact, DIN Rail

The K-ELECTRIC 103061 is a 3-phase monitoring relay that supervises undervoltage, phase sequence, and phase failure. Unlike basic voltage relays, it combines all three functions in one compact DIN-rail module, making it suitable for protecting motors and equipment from incorrect phase rotation or voltage drops.

Highlights

• Monitors undervoltage, phase sequence, and phase failure
• Adjustable undervoltage threshold: 80–95% of nominal voltage
• Self-powered from the monitored 3 x 400V AC supply
• 1 changeover contact rated 8A / 250V AC
• Adjustable response delay: 0.1–10 seconds
• LED indicators for operating status, phase presence, and error
• DIN rail mounting, 35 mm width (2 modules)

In daily use

The relay connects directly to the three phases; no separate supply voltage is required. When all phases are present and the voltage remains above the set threshold, the output relay energises. If a phase is lost, the sequence is reversed, or the voltage drops below the threshold, the relay de-energises after the set delay, protecting downstream equipment. The front LEDs provide immediate status indication.

Full specifications

• Product type: 3-phase monitoring relay
• Monitoring functions: undervoltage, phase sequence, phase failure
• Nominal monitored voltage: 3 x 400V AC
• Undervoltage threshold: adjustable, 80–95% of nominal voltage
• Output contact: 1 changeover (CO), 8A / 250V AC
• Supply voltage: self-powered from L1, L2, L3
• Mounting: DIN rail TS35
• Housing width: 35 mm (2 modules)
• Response delay: adjustable, 0.1–10 s
• Reset: automatic
• Indication: LEDs for status, phase presence, error
• Connection: screw terminals
• Operating temperature: -20°C to +55°C

Final note

The K-ELECTRIC 103061 is a self-powered monitoring relay for three-phase systems, providing undervoltage, phase sequence, and phase failure protection in a compact DIN-rail housing.