Single-phase Current Relay K8AK-AS Ideal for Current Monitoring for Industrial Facilities and Equipment. Monitor for overcurrents or undercurrents. Use commercially available CTs (CT current on secondary side: 0 to 1 A or 0 to 5 A). Manual resetting and automatically resetting supported by one Relay. Startup lock and operating time can be set separately. One SPDT output relay, 5 A at 250 VAC (resistive load). Output relay can be switched between normally open and normally closed. Output status can be monitored using LED indicator. Inputs are isolated from the power supply. Refer to Safety Precautions on page 9. Refer to page 8 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 Setting range Power supply voltage Model 2 to 20 mA AC/DC, 24 VAC/DC K8AK-AS1 24 VAC/DC 10 to 100 mA AC/DC, 100 to 240 VAC K8AK-AS1 100-240 VAC 50 to 500 mA AC/DC 0.1 to 1 A AC/DC, 24 VAC/DC K8AK-AS2 24 VAC/DC 0.5 to 5 A AC/DC, 100 to 240 VAC K8AK-AS2 100-240 VAC 0.8 to 8 A AC/DC 24 VAC/DC K8AK-AS3 24 VAC/DC 10 to 100 A AC*, 20 to 200 A AC* 100 to 240 VAC K8AK-AS3 100-240 VAC *1 The K8AK-AS3 is designed to be used in combination with an OMRON K8AC-CT200L Current Transformer (CT). (Direct input is not possible.) Accessory (Order Separately) OMRON CT Commercially Available CTs* Applicable CT current on secondary Appearance Input range Model Appearance Applicable Relay Relay side 10 to 100 A AC, 0 to 1 A AC, K8AK-AS3 K8AC-CT200L K8AK-AS2 20 to 200 A AC 0 to 5 A AC * If you use a commercially available CT, do not exceed the overload capacity of the K8AK-AS2. 1K8AK-AS Ratings and Specifications Input Range Connection *1 Model Range Setting range Input impedance Input type Overload capacity terminal 0 to 20 mA AC/DC I1-COM 2 to 20 mA AC/DC, Approx. 5 Direct input 10 to 100 mA AC/ 0 to 100 mA AC/DC I2-COM Approx. 1 Direct input K8AK-AS1 DC, 50 to 500 mA 0 to 500 mA AC/DC I3-COM Approx. 0.2 Direct input AC/DC Continuous input at Approx. 0.12 0 to 1 A AC/DC I1-COM 120% of maximum input (Load : 0.5 VA) Direct input 1 s at 150% 0.1 to 1 A AC/DC, Approx. 0.02 or commer- K8AK-AS2 0 to 5 A AC/DC I2-COM 0.5 to 5 A AC/DC, (Load : 1.5 VA) cially avail- 0.8 to 8 A AC/DC able CT Approx. 0.02 0 to 8 A AC/DC I3-COM (Load : 3 VA) Continuous input at 120% with 0 to 100 A AC I2-COM --- OMRON CT an OMRON CT (K8AC- *2 10 to 100 A AC , CT200L). K8AK-AS3 *2 20 to 200 A AC 30 s at 200% 0 to 200 A AC I3-COM --- OMRON CT 1 s at 600% * CT capacity on primary side. *1 The range is selected using connected terminals. *2 The K8AK-AS3 is designed to be used in combination with an OMRON K8AC-CT200L Current Transformer (CT). (Direct input is not possible.) Ratings 24 VAC/DC Power supply voltage Isolated power supply 100 to 240 VAC 24 VAC/DC: 2.0 VA/1.1 W max. Power consumption 100 to 240 VAC: 4.6 VA max. 10% to 100% of the maximum value of the setting range K8AK-AS1: 2 to 20 mA AC/DC 10 to 100 mA AC/DC 50 to 500 mA AC/DC K8AK-AS2: 0.1 to 1 A AC/DC (Compatible with commercially available CTs.) Operating value setting range (SV) 0.5 to 5 A AC/DC (Compatible with commercially available CTs.) 0.8 to 8 A AC/DC K8AK-AS3: When used with the OMRON CT (K8AC-CT200L). 10 to 100 A AC 20 to 200 A AC Operating value 100% operation at set value Reset value setting range (HYS.) 5% to 50% of operating value Manual reset/automatic reset (switchable) Reset method Note: Manual reset: Turn OFF power supply for 1 s or longer. Operating time setting range (T) 0.1 to 30 s 0 to 30 s Startup lock time setting range (LOCK) (The startup lock timer starts when the input has reached approximately 30% or more of the set value.) Note: Enabled only for overcurrent operation. Note: Enabled only for overcurrent operation. Indicators Power (PWR): Green, Relay output (RY): Yellow, Alarm outputs (ALM): Red Input impedance Refer to Input Range on this page. Output relays One SPDT relay (NO/NC switched using DIP switch.) Rated load Resistive load 5 A at 250 VAC 5 A at 30 VDC Output relay ratings Maximum switching capacity: 1,250 VA, 150 W 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. 0.49 to 0.59 Nm Terminal screw tightening torque 2