K8AK-TH | Omron, Europe


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  • K8AK-TH Temperature Monitoring Relay Datasheet
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Protect your heating application

This temperature monitoring relay was designed specially for monitoring abnormal temperatures to prevent excessive temperature increase and to protect equipment. K8AK-TH provides temperature monitoring in slim design with a width of just 22.5mm.

Simple function settings using DIP switchSelectable alarm latch and SV setting protectionMulti-input support for thermocouple or Pt100 and Pt1000 sensor inputChangeover relay: fail-safe selectableAlarm status identification with LED
Specifications & ordering info

Ordering information

Input type

Temperature setting range

Setting unit

Supply voltage

Size in mm (H×W×D)

Order code

Pt100 and Pt1000

0 to 999°C/F


100 to 240 VAC


K8AK-TH11S AC100-240




0 to 1,800°C
0 to 3,200 °F 1


100 to 240 VAC

K8AK-TH12S AC100-240





100 to 240 VAC 50/60 Hz

24 VAC 50/60 Hz or 24 VDC

Allowable voltage range

85 to 110% of power supply voltage

Power consumption

5 VA max.

2 W max. (24 VDC), 4 VA max. (24 VAC)

Sensor inputs


Thermocouple: K, J, T, E; platinum-resistance thermometer: Pt100, Pt1000


Thermocouple: K, J, T, E, B, R, S, PLII

Output relay

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

External inputs
(for latch setting)

Contact input

ON: 1 kΩ max., OFF: 100 kΩ min.

Non-contact input

ON residual voltage: 1.5 V max., OFF leakage current: 0.1 mA max.

Leakage current: Approx. 10 mA

Setting method

Rotary switch setting (set of three switches)


Power (PWR): Green LED, relay output (ALM): Red LED

Other functions

Alarm mode (upper limit/lower limit), output normally ON/OFF selection, output latch, setting protection,
fail-safe operation selectable, temperature unit °C/°F

Ambient operating temperature

-20 to 55°C (with no condensation or icing)

Storage temperature

-25 to 65°C (with no condensation or icing)

Setting accuracy

±1% of full scale

Hysteresis width


Output relays

(1 × 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 5 A, 250 VAC or 30 VDC

Sampling cycle

100 ms


160 g

Degree of protection


Memory protection

Non-volatile memory (number or writes: 1,000,000)

Safety standards

Approved standards

EN 61010-1 (Pollution level 2, overvoltage category II)

Application standards

EN 61326-1, UL 61010-1, Korean Radio Waves Act (Act 10564), CSA:CAN/CSA C22.2 No.14, CCC: GB14048.5

Crimp terminals

Two solid wires of 2.5 mm2 or two ferrules of 1.5 mm2 with insulation sleeves can be tightened together

Case material

PC and ABS


Mounted to DIN-rail

Size in mm (H×W×D)


1. Setting range depending on sensor type selected

1. Setting range depending on sensor type selected


Protect your heating application

If a temperature sensor is damaged or the SSR is short circuited in a furnace, the controller has no means of stopping rises in temperature. An internal alarm can help, but there is still some risk if the controller fails. This risk is eliminated by the built-in redundancy of the K8AK-TH alarm unit which can automatically switch off the power to the furnace.

Prevent overheating in cabinets

Temperature rises due to heat dissipation from SSRs within a cabinet can be too high for efficient operation. Simple ON/OFF control with the K8AK-TH can protect against overheating without the necessity and expense of running the fans continuously.

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