New Product Three-phase Asymmetry and Phase-sequence Phase-loss Relay K8AK-PA Ideal for 3-phase Voltage Asymmetry Monitoring for Industrial Facilities and Equipment. Greater resistance to inverter noise. Monitor voltage asymmetry, phase sequence, and phase loss for three-phase 3-wire or 4-wire power supplies with just one Unit. Switch setting for 3-phase 3-wire or 3-phase 4-wire power supply. One SPDT output relay, 5 A at 250 VAC (resistive load). World-wide power specifications supported by one Unit (switchable). Relay status can be monitored using LED indicator. For the most recent information on models that have been certified for safety standards, refer to your OMRON website. Refer to Safety Precautions on page 9. Refer to page 8 for commonly asked questions. Ordering Information List of Models Rated input* Model 3-phase 3-wire mode 200, 220, 230, 240 VAC K8AK-PA1 3-phase 4-wire mode 115, 127, 133, 138 VAC 3-phase 3-wire mode 380, 400, 415, 480 VAC K8AK-PA2 3-phase 4-wire mode 220, 230, 240, 277 VAC Note: Three-phase, three-wire or four-wire and the input range are switched using a DIP switch. * The power supply voltage is the same as the rated input voltage. Single K8AK Monitors 3-phase Power Supply with 3 or 4 Wires Monitoring Relays can be used to monitor 3-phase power supplies with 3 or 4 wires simply by changing DIP switch settings. Phase to phase voltage (3 wires) Phase to neutral voltage (4 wires) L1 L2 L3 L1 L2 L3 N 230VAC 400VAC 230VAC 400VAC 400VAC 230VAC A Single K8AK Can Monitor a 3-phase Power Supply Anywhere in the World Reduces Maintenance Parts Inventory SW3 ON OFF ON OFF SW4 ON ON OFF OFF ON P-N 138 V 133 V 127 V 115 V K8AK-PA1 SW2 OFF P-P 240V 230 V 220 V 200 V ON P-N 277 V 240 V 230 V 220 V K8AK-PA2 SW2 OFF P-P 480 V 415 V 400 V 380 V 1K8AK-PA Ratings and Specifications Ratings Three-phase, three-wire Mode: 200, 220, 230 and 240 VAC K8AK-PA1 Three-phase, four-wire Mode: 115, 127, 133 and 138 VAC Rated input volt- age Three-phase, three-wire Mode: 380, 400, 415 and 480 VAC K8AK-PA2 Three-phase, four-wire Mode: 220, 230, 240 and 277 VAC K8AK-PA1: Approx. 4.4 VA Input load K8AK-PA2: Approx. 4.4 VA Operating value setting range (ASY.) Asymmetry set value: 2% to 22% Asymmetry operating value = Rated input voltage Asymmetry set value (%) Operating value The asymmetry operation will function when the potential difference between the highest and lowest voltage phases equals or exceeds the asymmetry operating value. Reset value setting range (HYS.) 5% of operating value (fixed) Reset method Automatic reset Asymmetry 0.1 to 30 s Operating time Phase sequence 0.1 s0.05 s setting range (T) Phase loss 0.1 s max. Power ON lock time (LOCK) 1 s/5 s (Changed with the DIP switch.) Indicators Power (PWR): Green, Relay output (RY): Yellow, Alarm outputs (ALM): Red Output relays One SPDT relay (NC operation) Rated load Resistive load 5 A at 250 VAC 5 A at 30 VDC Maximum switching capacity: 1,250 VA, 150 W Output relay ratings Minimum load: 5 VDC, 10 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