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Thermal Management for Enclosures
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Wednesday, June 20, 2018
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Electronic Hygrotherm

The KSHTC Hygrotherm senses the ambient temperature and relative air humidity. Depending on which contact combination is chosen, it then turns on or off a connected device if either the temperature is below, or the humidity above the set point. The integrated LED in each adjustment knob is lit, indicating the active function.



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120-230 VAC, 50/60 Hz
°F / %RH
120-230 VAC, 50/60 Hz
°C / %RH
24-48 VDC
°C / %RH

* Contact Kooltronic for quantity pricing.

  • Controls both temperature and humidity
  • Optical function displays
  • DIN rail mountable
  • High switching capacity


Temperature range:
32-140°F (0-60°C) adjustable
Humidity range: 50-90% RH adjustable
Switching difference (temperature):
Approximately 3.6°F (2K) ± 1K tolerance
Switching difference (humidity): Approximately 4% RH ± 1% tolerance
Response time: Approximately 5 seconds
Contact type: Change-over contact
Relay output (max. switching capacity): 0. 6A @ DC60 V*
Max. inrush current AC 30 A for 10 sec.
Service life: >30,000 cycles
Function control light: LED
Connections: 5-pole terminal for AWG 14 max. (2.5 mm)**
Mounting: Clip for 35mm DIN rail (EN 60715)
Housing: Plastic, UL94V-0
Weight: Approximately 3.5 oz (100g)
Mounting position: Vertical
Operating temperature: -40 to 140°F (-40 to 60°C)
Storage temperature: -40 to 140°F (-40 to 60°C)
Protection type: IP20
*Not UL confirmed.
**When connecting with stranded wires, wire end ferrules must be used.
Contacts 1 & 2: Supply voltage 
Relay output: Contacts 3 & 5 and contacts 4 & 5 (see table below)
close at...
open at...
use for
3 and 5
humidity rise or temperature drop
humidity drop or temperature rise
heaters, de-humidifiers, low-temp alarms
4 and 5
humidity drop or temperature rise
humidity rise or temperature drop
cooling, humidifiers, high-temp alarms
DIMENSIONS (click and drag to pan)
Dimensions, inches [mm], are for reference only and subject to change.
Specifications are subject to change without notice. Suitability of this product for its intended use and any associated risks must be determined by the end customer/buyer in its final application.

Specify model number.



Series 21 Data Sheet
View Data Sheet
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