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.

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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