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Mechanical Hygrostat

The KSMH50 and KSMH65 have been designed to control the relative air humidity inside of enclosures. When connected to an enclosure heater, (de-humidifier), it will turn the heater on at the preset humidity setpoint in order to raise the dew point. This helps prevent damage and malfunction of electronic components caused by condensation and corrosion. These units can also be used to control cooling fans, warning lights or other devices.


Mechanical Hygrostat

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50% RH setpoint
65% RH setpoint

* Contact Kooltronic for quantity pricing.


Switching tolerance:
±5% RH
Switching difference (hysteresis):
4% RH (±3% tolerance)
Permissible air velocity: 50 ft/sec (15m/s)
Contact type: Contact maker (normally open)
Contact resistance: <10mΩ
Service life: 50,000 cycles
Minimum switching capacity:
100mA @ AC/DC 20 V
Maximum switching capacity: 5A @ AC 250 V (resistive load)
  0.2A @ AC 250 V
  (inductive load at cos φ = 0.8)
  DC 20W
EMI/EMC compliance: EN 55014-1-2, EN 61000-3-2, EN 61000-3-3
Connection: 2-pole terminal, AWG 14 max. (2.5 mm²)
Mounting: Clip for 35mm DIN rail (EN 50022)
Housing: Plastic, UL94V-0
Weight: 1.4 oz (40g)
Operating temperature: 32 to 140°F (0 to 60°C)
Storage temperature: -4°F to 176°F (-20 to 80°C)
Protection type: IP20
Application examples: Electrical & Electronic enclosures
  Telecommunication systems
  Display panels
  Ticket dispensers
  Automatic teller machines (ATM's)
  Access & Parking control systems
Agency approvals: CE, UL submitted for approval
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.



Contact type
Change-over contact


Series 21 Data Sheet
View Data Sheet
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