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Small white rectangular sensor with surface-mount tabs and two wire leads

Winland Electronics

Winland Electronics WLTA40 Low Temp Sensor 39.5°F/4.17°C 24V 200mA

SKU CH-FPKY-ZMJQ2

A surface-mount sensor that opens its contacts at 39.5 °F (4.17 °C) to trigger a 24 V alarm panel or dialer

  • Main materialHAWA
  • Product weight0.07
  • Triggers alarm when temperature falls below 39.5°F
  • Activates alarm panels dialers or wireless systems
  • Rated for 24 VAC or VDC at 200 mA
  • Fixed single set point at 39.5°F / 4.17°C
  • Surface mount NC contact opens on low temperature

Preset Low-Temperature Sensor

The Winland Electronics WLTA40 is a surface-mount control sensor that opens its contacts when the ambient temperature falls below 39.5 degrees Fahrenheit (4.17 degrees Celsius). It is intended for installers and property managers who need a fixed, single-point trigger to activate an alarm panel, dialler or wireless alarm system. The device operates at 24 VAC or 24 VDC with a current rating of 200 mA.

Power And Wiring Check

Verify that the control circuit can supply 24 VAC or 24 VDC at up to 200 mA before connecting the sensor. Confirm that the alarm panel, dialler or wireless transmitter accepts a normally-closed contact opening on temperature drop. Ensure the mounting surface allows the sensor to measure ambient air accurately without local heat sources affecting the reading.

Surface-Mount Build And Daily Use

The unit weighs 0.07 units and uses HAWA material for its housing, providing a compact profile suited to wall or ceiling mounting. Its fixed 39.5 °F set point requires no field adjustment, so the sensor delivers consistent activation once installed. The normally-closed contact logic means a wiring fault or power loss also opens the circuit, giving a fail-safe indication to the connected alarm system.

How it compares

Measured against everything we stock in Sensors, Buzzers & Control Modules, at today’s prices. Recalculated every night.

Price $23.99
Cheaper than about 60% of the 89 comparable items (median $29.99).

Specifications

Product
Brand nameWinland Electronics
Size & build
Main materialHAWA

Questions about this item

What comes in the box with the WLTA40 sensor and is any extra hardware required?

The sensor itself is supplied; mounting hardware and the 24 V power source for the alarm circuit are not included.

Should I choose the 24 VAC or 24 VDC version for my alarm panel?

The single WLTA40 model is rated for both 24 VAC and 24 VDC at 200 mA, so either supply type works.

What does the 39.5 °F trigger point mean once the unit is installed?

When the ambient temperature falls to 39.5 °F (4.17 °C) the normally closed contacts open, sending a signal to the connected alarm panel or dialer.

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