Omron K8AK-TS1 100-240VAC Thermistor Motor Protection Relay

USD 57.51

Thermistor motor protection relay; 100-240 VAC. Specs: PTC input, SPDT contact (5A 250VAC), 22.5mm DIN-rail mount, IP20 rating, and integrated sensor fault diagnostics.

SKU Omron-K8AK-TS1 100-240VAC Category
Industrial Relays > Monitoring Relays

Omron K8AK-TS1 100-240VAC Thermistor Motor Protection Relay

Model Identifier K8AK-TS1 100-240VAC
Official Part Number K8AK-TS1 100-240VAC
GTIN Standard 4548583506633

Technical Overview

The Omron K8AK-TS1 100-240VAC is a professional-grade motor thermistor protection and temperature monitoring relay. Designed to mount seamlessly on a standard DIN rail, this compact 22.5mm unit monitors temperature rise caused by internal motor loss via a PTC thermistor input. It features integrated monitoring for thermistor disconnections and short circuits. With a rugged IP20 housing and an SPDT output rated at 5A, it is a robust solution for preventing thermal damage in 100-240 VAC single-phase or three-phase motor control applications.

Key Features

  • Monitors temperature rise through internal motor loss using a PTC thermistor input
  • Detects thermistor disconnections and short circuits for complete system safety
  • Compact 22.5mm width profile designed for space-saving DIN rail mounting
  • Selectable manual or automatic resetting configurations using the same relay
  • Test/Reset button integrated for easy confirmation of output operation
  • Wide supply voltage range compatibility from 100 to 240 VAC (50/60Hz)

Precision PTC Thermistor Motor Protection with Disconnect and Short-Circuit Monitoring

Technical Specification Matrix

ParameterValue
Supply Voltage100-240 VAC (50/60 Hz)
Input Type1 x PTC Thermistor (Analog)
Output Type1 x SPDT (Digital)
Output Rating250 VAC / 5A; 30 VDC / 5A (Resistive Load)
Operating Temperature-20°C to 60°C
MountingDIN Rail
Dimensions (W x H x D)22.5 mm x 90 mm x 100 mm
IP RatingIP20
Terminal TypeScrew Connection

Industrial Applications

1. Heavy-Duty Pump Motor Protection

In municipal water treatment or industrial fluid handling, large pumps run continuously and are susceptible to overheating due to overload or fluid blockage. The K8AK-TS1 interfaces with the motor's embedded PTC thermistor to directly monitor the internal winding temperature, tripping the SPDT contact before thermal degradation occurs.

Problem Solved

Prevents catastrophic motor failure in continuous-duty pumping systems by reliably detecting dangerous temperature spikes and cutting power, effectively substituting inferred overload protection with direct thermal measurement.

PTC ThermistorMotor ProtectionSPDT RelayOverheating PreventionDIN Rail Mount

2. Industrial Conveyor Belt Motor Safeguard

Long conveyor systems in manufacturing plants often experience variable mechanical loads resulting in localized motor heating. The K8AK-TS1 100-240VAC provides immediate intervention if the motor exceeds safe thermal limits, while also diagnosing control circuit issues like thermistor wire breaks or short circuits.

Problem Solved

Reduces unplanned downtime on factory floors by monitoring the exact motor temperature and diagnosing sensor-side wiring faults (short circuits or disconnections) before a fire or breakdown happens.

Thermistor Short-Circuit Detection100-240 VACMotor WindingsThermal OverloadIndustrial Automation

3. HVAC Compressor Thermal Overload Monitoring

Large commercial HVAC systems rely on compressors that can overheat due to refrigerant starvation, short cycling, or heavy loads. By implementing the K8AK-TS1, the control panel can directly supervise the PTC thermal inputs from the compressor, shutting down the contactor immediately upon reaching critical limits.

Problem Solved

Protects expensive HVAC compressor motors from burning out due to internal overheating, ensuring uninterrupted climate control operations and eliminating manual reset delays with its configurable auto-reset capabilities.

Compressor ProtectionPTC InputThermal OverloadHVAC Control PanelAuto-Reset Control
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