Small Compact Thermostat
STO 011 / STS 011

  • Thumbwheel setting dial
  • Small hysteresis
  • High switching capacity
  • Anti frost assurance
  • Optimized housing for better air flow

The mechanical thermostat is a two state regulator with small hysteresis. The setting wheel has an anti frost assurance. The housing ensures an optimized air circulation around the bimetal.

STO 011: Thermostat (NC); contact breaker for regulating heaters. The contact opens when temperature is rising.

STS 011: Thermostat (NO); contact maker for regulating of filter fans and heat exchangers or for switching signal devices when temperature limit has been exceeded. The contact closes when temperature is rising.

Technical Data

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Switch temperature difference4K (±3K tolerance)
Sensor elementthermostatic bimetal
Contact typesnap-action contact
Service life> 100,000 cycles
Max. switching capacity250VAC, 10 (2) A / 120VAC, 15 (2) A
DC 30W at 24VDC to 72VDC
Max. inrush currentAC 16A for 10 sec.
Connection2-pole terminal, clamping torque 1Nm max.:
rigid/stranded1 wire 2.5mm² (AWG 14)
Mountingclip for 35mm DIN rail, EN 60715
Casingplastic according to UL94V-0, light grey
Dimensions70 x 33 x 42mm
Weightapprox. 50g
Fitting positionvariable
Operating/Storage temperature-45 to +80°C (-49 to +176°F)
Operating/Storage humiditymax. 90% RH (non-condensing)
Protection typeIP20
ApprovalsVDE, UL File No. E164102, 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.

Anti frost assurance

The anti frost assurance is a symbol on the setting scale of the NC thermostat
(STO 011) at +11°C. This setting assures closing of the switching contact before 0°C.

Setting rangeArt. No. Contact breaker (NC)Art. No. Contact maker (NO)
0 to +60°C01115.0-0001116.0-00
+32 to +140°F01115.9-0001116.9-00

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Technical Drawing

Small Compact Thermostat STO 011 / STS 011

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