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Omron K8AK-TS1 100-240VAC — front face of the 22.5 mm DIN-rail PTC thermistor motor protection relay showing the green PWR LED, the red TS_ALM LED, the front-panel TEST / RESET button, the upper PTC input terminals (T1, T2) and the lower SPDT output terminals (11, 12, 14) plus Y1 reset link

Omron K8AK-TS1 100-240VAC — PTC Motor Thermistor Relay

SKU: K8AK-TS1 100-240VAC

USD 27.00

Omron K8AK-TS1 100-240VAC PTC thermistor motor protection relay, 22.5 mm DIN-rail, SPDT 5 A, manual / auto reset. In stock, China shipping.

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Product Overview

The Omron K8AK-TS1 100-240VAC is a PTC thermistor motor protection relay from the K8AK-TS series, manufactured by Omron Corporation. Hengyixin Automation stocks this relay in Xiamen and ships within 3-5 business days in original Omron packaging with the lot code visible.

The relay watches a single PTC thermistor embedded in the motor windings. When the winding temperature rises, the PTC resistance climbs above the 3,100 Ohm operate level and the SPDT output trips within 0.2 s. The relay also flags a thermistor short circuit below 10 Ohm and an open thermistor. Reset is selectable automatic or manual via the Y1-T2 link.

The 22.5 mm wide DIN-rail housing has a front-panel TEST / RESET button for output confirmation. PWR green LED shows power; TS_ALM red LED shows thermistor fault. 100-240 VAC supply. The K8AK-AS1 24VAC-DC sibling is the matching current monitoring relay in the same K8AK family; the K8DS-PH1 adds 3-phase phase sequence / phase loss monitoring in the K8DS platform.

Key Features

  • K8AK-TS PTC thermistor motor protection relay, single PTC input, 100-240 VAC supply, 22.5 mm DIN-rail housing
  • PTC operate 3,100 Ohm, reset 1,650 Ohm, short-circuit threshold 10 Ohm, 0.2 s operating time
  • One SPDT output relay 5 A at 250 VAC / 5 A at 30 VDC, selectable auto or manual reset via Y1-T2 link
  • Front-panel TEST / RESET button, PWR green LED, TS_ALM red LED, IP20 terminals, -20 to +60 C
  • SKU: K8AK-TS1 100-240VAC
  • Series: Omron K8AK-TS-series thermistor motor protection relay
  • Voltage: 100-240 VAC

Best-Fit Applications

  • Winding-temperature trip on a 3-phase induction motor where the embedded PTC signals a locked-rotor overheat before insulation failure
  • Coolant pump motor protection on a CNC machine tool cabinet where the PTC inside the pump motor drives the relay output to the safety controller
  • Spare replacement on a conveyor panel where the existing K8AK-TS1 has flagged a permanent thermistor fault and the relay must be replaced

Buying Checklist

  • Pick the K8AK-TS1 100-240VAC for a PTC thermistor motor protection relay on a 22.5 mm DIN-rail body with a 100-240 VAC supply.
  • Pick the K8AK-PT1 100-240VAC instead when the relay also needs 3-phase phase-sequence and phase-loss monitoring on the same 22.5 mm housing.
  • Pick the K8AK-TS1 24VAC/DC instead when the cabinet power supply is 24 VDC rather than 100-240 VAC.

Technical Specifications

Manufacturer Omron Corporation (Japan)
Series Omron K8AK-TS-series thermistor motor protection relay
Model / SKU K8AK-TS1 100-240VAC
Function Motor winding temperature monitoring via PTC thermistor input
PTC Operate / Reset Operate 3,100 Ohm, reset 1,650 Ohm, short-circuit 10 Ohm
Operating Time 0.2 s on PTC input error
Output One SPDT relay, 5 A at 250 VAC / 5 A at 30 VDC resistive
Reset Method Automatic (Y1-T2 open) or manual (Y1-T2 closed), front-panel TEST / RESET button
Supply Voltage 100-240 VAC, 50/60 Hz
Indicators PWR green LED, TS_ALM red LED
Power-On Lock 0.6 s
Environment / Mounting 22.5 (W) x 95 (H) x 100 (D) mm, 150 g, IP20, -20 to +60 C, PC + ABS UL 94 V-0 case, DIN-rail

FAQ for K8AK-TS1 100-240VAC

What is the Omron K8AK-TS1 100-240VAC used for?
It is a PTC thermistor motor protection relay for monitoring the winding temperature of a 3-phase motor. The relay reads a single PTC sensor embedded in the windings and trips an SPDT output when the temperature exceeds the PTC operate level.
K8AK-TS1 vs K8AK-PT1 - what is the difference?
The K8AK-TS1 watches the PTC thermistor only. The K8AK-PT1 also watches 3-phase sequence and phase loss on the same 22.5 mm body and the same 100-240 VAC supply. Pick the TS1 for temperature-only and the PT1 for combined temperature plus 3-phase quality.
Does the K8AK-TS1 detect a thermistor short circuit?
Yes. Below 10 Ohm on the PTC input the relay flags a short-circuit fault and trips the output the same way as an over-temperature trip. An open thermistor connection is also detected and latched.
How do I switch from auto reset to manual reset?
Short the Y1 and T2 terminals on the front block to select manual reset. Leave them open for automatic reset. The front-panel TEST / RESET button clears a manual-reset fault when the PTC input returns to the reset level of 1,650 Ohm.
What PTC resistance does the K8AK-TS1 need?
Operate at 3,100 Ohm and reset at 1,650 Ohm. These match the standard Omron PTC thermistor ratings; a motor winding PTC at 25 C typically reads 50-500 Ohm and climbs above 3,000 Ohm at its rated trip temperature.

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