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Mechanical Thermostat - KSMT

The KSMT Mechanical Thermostat is designed to control the air temperature inside of enclosures and control panels. It can be used for enclosure heaters, cooling equipment (e.g. filter fans), or signal devices.


An integrated resistor (RF) can be connected to increase accuracy when these units are used with an enclosure heater (contact Kooltronic for quantity pricing).

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Select Model Type

ModelVoltageAdjustment Range
KSMTF120 VAC50-140°F
KSMT120 VAC10-60°C
K2SMTF230 VAC50-140°F
K2SMT230 VAC10-60°C

TECHNICAL DATA

Model Number:
Voltage:
Adjustment Range:
KSMTF50-140°F
KSMT10-60°C
K2SMTF50-140°F
K2SMT10-60°C
TECHNICAL DATA
Sensor element:
Thermostatic bi-metal
Contact type:
Change-over, snap-action contact
Switching difference (hysteresis):
Approx. 4K (7.2°F), 0.5K (1°F) with RF
Contact resistance:<10mΩ
Maximum switching capacity:
Break contact 10A resistive/4A inductive @ 250 VAC
 Make contact 5A resistive/2A inductive @ 250 VAC
EMI/EMC conformity:EN 55014-1-2, EN 61000-3-2, EN 61000-3-3
Connections:4-pole terminal for AWG 14 max. (2.5 mm²)
Mounting:Clip for 35mm DIN rail (EN 50022)
Housing:Plastic, UL94V-0
Weight:3.5 oz (100 g)
Protection type:IP20
Operating/storage temperature:-49 to 158°F (-45 to 70°C)

  • Standard Features
  • Arrangement
• Wide adjustment range
• Available with °F or °C scale
• Change-over contact
• High switching capacity
• DIN rail mountable
Click on image for larger view
General Arrangement Thumbnail
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Thermostat KSMT general arrangement drawing
Dimensions, inches [mm], are for reference only and subject to change.

Dimensions, inches [mm], are for reference only and subject to change.
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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.

*Optional connection of terminal "N" will cause the RF heating resistor to work, thus reducing the difference between actual enclosure temperature and the temperature reading inside the thermostat (switch-off temperature).

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Tuesday, August 11, 2026  
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Kooltronic, Inc.
30 Pennington-Hopewell Road
Pennington, NJ 08534 USA
609-466-3400
800-321-KOOL
609-466-1114 (fax)
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