Compact Thumbwheel Thermostat
STO 011 / STS 011

  • Adjustable thumbwheel setting
  • Compact design
  • Small hysteresis
  • High switching capacity
  • DIN rail mountable

The ST 011 thermostat is an SPST regulator with small hysteresis. The housing design ensures optimized air circulation around the sensor element.

Thermostat NC (normally closed): Thermostat opens on temperature rise (red thumbwheel) - for regulating heaters or for switching signal devices when temperature has fallen below the minimum value.

Thermostat NO (normally open): Thermostat closes on temperature rise (blue thumbwheel) - for regulating filter fans, heat exchangers, cooling devices or for switching signal devices when temperature limit has been exceeded.

Switching difference7 °F (4 K) ± 5.4 °F (3 K) tolerance
Sensor elementthermostatic bimetal
Contact typesnap-action contact
Service life> 100,000 cycles
Max. switching capacity15 A resistive / 2 A inductive @ AC 120 V
10 A resistive / 2 A inductive @ AC 250 V
DC 30 W (DC 24-72 V)
Max. inrush currentAC 16 A for 10 sec.
Connection2-pole terminal, clamping torque 1 Nm max.:
solid/stranded1 wire - AWG 14 max. (2.5 mm²)
Housingplastic, UL 94V-0, light grey
Mountingclip for 35 mm DIN rail, EN 60715
Mounting positionvariable
Operating / Storage temperature-49 to +176 °F (-45 to +80 °C)
Operating / Storage humiditymax. 90 %RH (non-condensing)
Dimensions2.76 x 1.3 x 1.65” (70 x 33 x 42 mm)
Weightapprox. 1.8 oz. (50 g)
Protection typeIP20
ApprovalsUL File No. E164102, VDE, EAC

¹ When connecting with stranded wires, wire end ferrules must be used.

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.

Convenient minimum setpoint symbol on the NC thermostat to assure enclosure temperature remains above freezing.


Part No. (NC)Part No. (NO)Setting range
01115.9-0001116.9-00+32 to +140 °F
01115.0-0001116.0-000 to +60 °C

To top

Dimensioned Drawing

Small Compact Thermostat ST 011

To top