Name: Omron K8DT-PH1CN 3-Phase Sequence & Phase Loss Monitoring Relay - INOSAKI
SKU: Omron-K8DT-PH1CN
Price: 54.29 USD
Availability: InStock

Technical Overview

The Omron K8DT-PH1CN is an ultra-slim 17.5mm measuring and monitoring relay designed to detect phase sequence errors and phase loss in 3-phase, 3-wire electrical systems. Operating across a global 200 to 480 VAC range, it provides continuous motor protection by effectively detecting phase loss even while the motor is actively running. The unit utilizes Push-In Plus terminals for fast, tool-free wiring and is engineered with high resistance to inverter noise, making it highly reliable for modern, high-density industrial control panels.

Key Features

Detects phase sequence errors and phase loss in 3-phase 3-wire systems.
Capable of detecting phase loss even while the motor is actively operating.
Ultra-slim 17.5 mm profile significantly reduces required DIN-rail panel space.
Push-In Plus terminals minimize wiring time and support double-insertion holes for crossover wiring.
High resistance to high-frequency inverter noise for reliable operation in VFD-controlled environments.
Global regulatory compliance including UL listing, EN 60947-5-1, and LR maritime certification.

Technical Specification Matrix

Parameter	Value
Input Voltage	3-phase, 200 to 480 VAC (3-wire)
Power Consumption	Approx. 2.6 VA
Output Type	1 x SPDT Relay
Width	17.5 mm
Terminal Type	Push-In Plus
Overvoltage Category	III
Pollution Degree	2

Industrial Applications

1. Industrial HVAC Compressor Motor Protection

Large industrial HVAC compressor units rely on 3-phase motors which are highly vulnerable to phase loss or reversed phase sequence, leading to reverse rotation or severe overheating. The K8DT-PH1CN continuously monitors the 200-480 VAC supply and shuts down the compressor immediately upon detecting a phase anomaly.

Problem Solved

Prevents mechanical damage and winding insulation breakdown in expensive 3-phase compressor motors by detecting phase sequence errors or loss of phase, even during active operation.

3-phase 3-wire200-480 VACPhase loss detectionSPDT RelayMotor protection

2. Material Handling Conveyor Systems

In manufacturing conveyor lines, motor reverse rotation due to incorrect phase sequencing can cause mechanical jams, product damage, or severe safety hazards. The compact 17.5mm Omron relay easily fits into crowded control panels and actively ensures proper phase orientation before allowing the motor starter contactor to engage.

Problem Solved

Eliminates the risk of reverse operation of conveyor belts upon startup or after facility power maintenance by verifying correct 3-phase sequence.

Phase sequence monitoring17.5mm widthPush-In Plus terminalsDIN-rail panel space

3. Maritime and Offshore Pumping Stations

Offshore pumping systems require robust power monitoring to protect critical ballast or cooling water pumps. Supported by its LR (maritime) certification and high resistance to inverter noise, the relay reliably monitors 3-phase power under harsh electrical conditions.

Problem Solved

Provides highly reliable phase loss monitoring in electrically noisy offshore environments where VFDs (Variable Frequency Drives) generate significant inverter noise that might trip standard relays.

LR maritime certifiedInverter noise resistanceOvervoltage category IIIPollution degree 2