K8AK-TS/-PT Temperature monitor Thermistor motor protection relay The K8AK-TS is the temperature monitoring relay based on the thermistor detection and can protect the motor from overheating. The K8AK-PT gives further functionalities such as temperature, 3-phase sequence and loss monitoring and contributes to the overall safety 3-phase motor‘s operation. • DIN 22.5-mm-sized K8AK-PT relays • Side-by-side mounting of K8AK-PT relays • Specially designed for internal motor monitoring, no setting required • Test/Reset button for confirmation of output operation • Monitoring also performed for thermistor disconnections and short circuits • Manual or automatic resetting with the same relay Ordering information Rated input Order code Temperature monitoring 24 VAC/DC K8AK-TS1 24 VAC/DC Phase sequence, phase loss and temperature monitoring 100 to 240 VAC K8AK-PT1 100-240 VAC K8AK-TS1 100-240 VAC Specifications Ambient operating temperature –20 to 60°C (with no condensation or icing) Storage temperature –25 to 65°C (with no condensation or icing) Input frequency 50/60 Hz (AC power supply) Output relays (2 × SPDT, normally closed operation) Resistive load 5 A at 250 VAC or at 30 VDC Maximum contact voltage 250 VAC or 30 VDC Maximum contact current 5 A Maximum switching capacity 1,250 VA, 150 W Mechanical life 10,000,000 operations Electrical life 50,000 operations at 250 VAC or 30 VDC Degree of protection Terminal section: IP20 Case material PC and ABS UL94 V-0 Weight Approx. 150 g Rated input voltage 3-phase, 3-wire mode: 200 to 480 VAC Reset method Manual reset/automatic reset (switchable)*1 Operating time (T) Phase-sequence on three-phase voltage input Phase loss on three-phase voltage input 0.1s ±0.05s 0.1 s max. (when the voltage changes rapidly from 100 to 0% of rated voltage) PTC thermistor input 0.2 s max. Overload capacity Continuous input: 528 V Indicators Power (PWR): Green, PH alarm outputs (ALM): Red, TS alarm outputs (ALM): Red Applicable standards Conforming standards EN 60947-5-1 Installation environment (pollution level 2, installation category III) EMC EN 60947-5-1 Safety standards UL 508 (Recognition), Korean Radio Waves Act (Act 10564), CSA and CCC Size in mm (H × W × D) 90 × 22.5 × 100 *1 Manual reset method: Press the TEST/RESET button. 660
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