Omron, K8AK / K8DS Series
Measuring & Monitoring Relays
K8AK / K8DS Series
Brand:
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.

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