Small Thermostat
KTO 111 / KTS 111

  • Safe wiring with Push-In terminals  
  • Faster and tool-free wiring  
  • Improved air intakes for ventilation
  • Easy adjustability of switch temperature setting  
  • for use in up to 5,000 m altitude  

The mechanical thermostats KTO 111 and KTS 111 are two state regulators for use up to 5,000 meters in altitude, thanks to optimized air gap and increased creepage distance. By use of Push-In terminals the thermostat is wired tool-free. The Push-In terminals provide constant pressure on the wires to prevent them from coming loose (e.g. during transport).  

Thermostat (NC): Thermostat opens on temperature rise – for regulating heaters or for switching signal devices. Comes with red temperature dial.

Thermostat (NO): Thermostat closes on temperature rise – for regulating filter fans and heat exchangers or for switching signal devices. Comes with blue temperature dial.

Switching difference12.6 °F ±7 °F tolerance (7 K ±4 K)
Sensor elementthermostatic bimetal
Contact typesnap-action contact
Service life100,000 cycles verified
Max. operating voltage, frequency rangeAC 250 V, 50-60 Hz
Max. inrush currentAC 16 A for 10 sec.
Connection12 Push-In clamps
solid/stranded wire - AWG 14 max. (2.5 mm²)
Housingplastic, UL 94V-0, light grey
Mountingclip for 35 mm DIN rail, EN 60715
Dimensions2.4 x 1.3 x 1.6" (60 x 33 x 41 mm)
Weightapprox. 1.4 oz. (40 g)
Mounting positionvariable
Operating/Storage temperature-49 to +176 °F (-45 to +80 °C)
Operating/Storage humiditymax. 90 % RH (non-condensing)
Protection type/Protection classIP20 / II
Overvoltage category/AltitudeII: up to 5,000 m; III: up to 2,000 m

1 Stripped length of solid wire: 0.4 to 0.5" (10-12 mm). When connecting with wires, wire end ferrules must be used (square or trapezoid crimp). Length of wire end ferrule: 0.4" or 0.5" (10 or 12 mm).

Important note: The contact system of the regulator is subjected to environmental influences, thus the contact resistance may change. This can lead to a voltage drop and / or self-heating of the contacts.


Setting range
Part No.
(NC)
Part No.
(NO)
Switching
current²/
AC 250 V
capacity 
AC 120 V
max.
DC 24-72 V
Approvals
+32 to +140 °F11100.9-0011101.9-0010 (2) A15 (2) A30 WVDEUL File No. E164102EAC
submitted
+14 to +122 °F11100.9-0111101.9-0110 (2) A15 (2) A30 WVDEUL File No. E164102EAC
submitted
0 to +60 °C11100.0-0011101.0-0010 (2) A15 (2) A30 WVDEUL File No. E164102EAC
submitted
-10 to +50 °C11100.0-0111101.0-0110 (2) A15 (2) A30 WVDEUL File No. E164102EAC
submitted
+20 to +80 °C11100.0-0211101.0-023 (2) A3 (2) A30 WVDEUL File No. E164102EAC
submitted

2 The level of switching current has an influence on the tolerance accuracy;

DIMENSIONED DRAWING

Small Thermostat KTO 111 / KTS 111