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K8AK / K8DS Series

Measuring & Monitoring Relays

K8AK / K8DS Series

DIN 22.5/17.5 Size Lineup of A Wide Range of Measuring and Monitoring Relays

K8AK-AS Single-phase Current Relay

• 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.

K8AK-AW Single-phase Overcurrent/Undercurrent Relays

• Monitor for overcurrents and undercurrents simultaneously.

 Separate settings and outputs supported for overcurrents and 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.

• Two sets of SPDT output contacts, 5 A at 250 VAC (resistive load).

• Output status can be monitored using LED indicator.

• Inputs are isolated from the power supply.

K8AK-VS Single-phase Voltage Relay

• Monitor for overvoltages or undervoltages.

• Manual resetting and automatically resetting supported by one Relay.

• One SPDT output relay, 5 A at 250 VAC (resistive load).

• Output relay can be switched between normally open and normally closed.

• Process control signal (0 to 10 V) and current splitter input supported.

• Output status can be monitored using LED indicator.

• Input frequency of 40 to 500 Hz supported.

• Inputs are isolated from the power supply.

K8AK-VW Single-phase Overvoltage/Undervoltage Relays

• Monitor for overvoltages and undervoltages simultaneously.

 Separate settings and outputs supported for overvoltages and undervoltages.

• Manual resetting and automatically resetting supported by one Relay.

• Pre-alarm Monitoring Mode.

• Two SPDT output relays, 5 A at 250 VAC (resistive load).

• Process control signal (0 to 10 V) and current splitter input supported.

• Output status can be monitored using LED indicator.

• Input frequency of 40 to 500 Hz supported.

• Inputs are isolated from the power supply.

K8DS-PH Phase-sequence Phase-loss Relay

• Lineup includes a 17.5-mm slim, compact model.

• Greater resistance to inverter noise.

• Distinguishes between positive phases, reversed phases, and phase loss when power is turned ON.

• Supports phase loss detection when the motor is operating.

• Output status can be monitored using LED indicator.

• Ideal to prevent reverse operation of motors.

K8AK-PH Phase-sequence Phase-loss Relay

• Greater resistance to inverter noise.

• Distinguishes between positive phases, reversed phases, 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.

K8AK-PW Three-phase Voltage Relay

• Greater resistance to inverter noise.

• Monitor overvoltages and undervoltages for three-phase 3-wire or 4-wire power supplies.

 DIP switch setting for 3-phase 3-wire or 3-phase 4-wire power supply.

• Two SPDT output relays, 5 A at 250 VAC (resistive load).

 Separate outputs possible for overvoltages and undervoltages.

• World-wide power specifications supported by one Unit (switchable using DIP switch).

• Relay status can be monitored using LED indicator.

K8AK-PM Three-phase Phase-sequence Phase-loss Relay

• Greater resistance to inverter noise.

• Monitor overvoltages, undervoltages, 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.

• Two SPDT output relays, 5 A at 250 VAC (resistive load).

 Output overvoltages and undervoltages using separate relays.

• World-wide power specifications supported by one Unit (switchable).

• Output status can be monitored using LED indicator.

K8AK-PA Three-phase Asymmetry and Phase-sequence Phase-loss Relay

• 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.

K8AK-TH Temperature Monitoring Relay

• Excessive temperature increases can be prevented and abnormal temperatures can be monitored.

• Temperature monitoring in slim design with a width of just 22.5 mm.

• Rotary switches simplifies temperature settings.

• Universal-input support for thermocouple or platinum resistance thermometer sensor input.

• Change the output relay between normally open and normally closed operation.

• Alarm status identification with LED indicator.

• Self-holding output.

K8AK-LS Conductive Level Controller

• Self-holding ON or OFF outputs can be selected using selfholding circuit.

• Sensitivity adjustment of operating resistance from 10 to 100 kΩ for application to a wide range of liquids.

• Prevents chattering of relay contacts that occurs with ripples.

• Easy wiring with ferrules.

• Use 2 × 2.5 mm2 solid wire or 2 × 1.5 mm2 ferrules.

• Applicable as a floatless switch.