Omron Phase, Voltage Monitoring Relay, 3 Phase, SPST, DIN Rail

Omron K8DT-PZ three phase sequence and phase loss monitor protects motors and other equipment from unstable voltages in the power supply system. Detect overvoltages, undervoltages, voltage asymmetry, phase sequence, and phase loss for three-phase power supplies.

Phase loss detection while the motor is operating
Greater resistance to inverter noise
Width of 17.5 mm to reduce space required in panels
Push-In Plus Terminal that reduce wiring work
Double-insertion holes for crossover wiring (all terminals)

• Downsize control panels.
• Reduced wiring.
• Detects errors in Motors and other equipment.
• Use in either over current or under current mode.
• Function as an alarm.
• Set threshold values.
• Alarm output can be set as a relay or transistor output.
• Input signal – Voltage, current, water level electrode and temperature (thermocouple or platinum resistance thermometer) can be input.
• Lower power consumption.
• Side by side mounting is possible.
• Long term contact reliability.
• Reliable in poor noise environments.
• Slim profile 17.5 mm

• Three Phase Voltage Monitoring Relay.
• Asymmetry.
• Phase-Sequence, Phase Loss relay.
• Detects under and over voltages.
• 3-Wire.
• Input range set with a rotary switch.
• Transistor output.
• Input voltage 3-phase, 3-wire 380 to 480 V ac.
• Input load 2.7 Va
• Phase sequence 0.1 s ±0.05 s
• Phase loss 0.1 s maximum.
• Current capacity 10 A (per pole)
• Insertions 50 times.

• Automatic reset
• Protects from unstable voltages in power supply.
• Green LED Power (PWR) power
• Yellow LED output (OUT) output
• Red LED output (ALM) alarm
• One SPDT contact relay.
• DIN Rail Mounted or Screw Mounted.
• Weight 100 g
• Case material PC, UL 94 V-0.
• Colour N1.5
• Protection IP20 (terminals)

A monitoring / measuring relay is a protective control device, various types are available suiting what you wish to monitor. The relays receive input signals then monitor them and then output an alarm signal when a set value is reached (alarm relays). The relays protect your equipment against over voltage and over current faults. Monitoring relays monitor AC power supplies, voltage and current, analogue signals detecting unusual activity in equipment against set alarm thresholds.

• Motor protection relays
• Temperature monitoring relays
• Water level control relays
• Voltage
• Current

EN 60947-5-1, UL 60947-5-1, IP 20 Terminals

Omron K8DT Series Control Relays

Omron K8DT measuring and monitoring relays are part of the Value Design for Panel concept that takes control panel design and manufacturing to a new level. The K8DT series protect important equipment from damage using various measuring and monitoring relays that conform to international safety standards. Low power consumption and low heat generation design offer a long service life.

Space Saving

The K8DT series can help downsize control panels by reducing the width between wiring ducts and void panel space. The slim body allows space to mount more devices in the same size of control panel to increase control panel functionality.

Push-In Plus Terminals

Push-In Plus terminal blocks on all K8DT relays reduce the time and work involved in wiring. The Push-In Plus terminals allow solid and stranded wires with pin terminals or ferrules to be inserted without the need for tools.