Phase-sequence Phase-loss Relay K8AK-PH Three-phase Phase-sequence Phase-loss Relay Using Voltage Detection Method Greater resistance to inverter noise. Distinguishes between correct phases, phase sequence, and phase loss when power is turned ON. Supports phase loss detection when the motor is operating. 5 A (resistive load) at 250 VAC, DPDT x 1. Output status can be monitored using LED indicator. Ideal to prevent reverse operation of motors. Refer to Safety Precautions on page 8. Refer to page 7 for commonly asked questions. For the most recent information on models that have been certified for safety standards, refer to your OMRON website. Ordering Information List of Models Function Rated input voltage* Relay output Model Phase sequence and phase loss 3-phase, 3-wire 200 to 480 VAC DPDT 1 K8AK-PH1 monitoring * The power supply voltage is the same as the rated input voltage. 1K8AK-PH Ratings and Specifications Ratings Rated input voltage 3-phase, 200 to 480 VAC (3-wire) Input load Approx. 4.1 VA Phase sequence 0.1 s0.05 s Operating time Phase loss 0.1 s max. (when the voltage changes rapidly from 100% to 0% of rated voltage) Reset method Automatic reset Indicators Power (PWR): Green, Relay output (RY): Yellow Output relays One DPDT relay (NC operation) Rated load Resistive load 5 A at 250 VAC 5 A at 30 VDC Output relay ratings Minimum load: 24 VDC, 4 mA (reference values) Mechanical life: 10 million operations min. Electrical life: 5 A at 250 VAC or 30 VDC: 50,000 operations 3 A at 250 VAC/30 VDC:100,000 operations Ambient operating temperature 20 to 60C (with no condensation or icing) Storage temperature 25 to 65C (with no condensation or icing) Ambient operating humidity 25% to 85% (with no condensation) Storage humidity 25% to 85% (with no condensation) Altitude 2,000 m max. Terminal screw tightening torque 0.49 to 0.59 Nm Recommended wire 2 Solid wire: 2.5 mm Twisted wires: AWG16, AWG18 Note: 1. Ferrules with insulating sleeves must be used with twisted wires. Terminal wiring method 2. Two wires can be twisted together. Recommended ferrules Al 1,5-8BK (for AWG16) manufactured by Phoenix Contact Al 1-8RD (for AWG18) manufactured by Phoenix Contact Al 0,75-8GY (for AWG18) manufactured by Phoenix Contact Case color N1.5 Case material PC and ABS, UL 94 V-0 Weight Approx. 130 g Mounting Mounts to DIN Track. Dimensions 22.5 90 100 mm (WHD) 2