Small Compact Thermostat STO 011 / STS 011 Series
- 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 anit 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 filter fans and heat exchangers or for switching signal devises when temperature limit has been exceeded. The contact closes when temperature is rising.
Technical Data
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| Switch temperature difference | 4K (±3K tolerance) |
| Sensor element | thermostatic bimetal |
| Contact type | snap-action contact |
| Service life | > 100,000 cycles |
| Max. switching capacity | 250VAC, 10 (2) A |
| 120VAC, 15 (2) A | |
| 30WDC at 24VDC to 72VDC | |
| Max. inrush current | 16AAC for 10 sec. |
| Connection¹ | 2-pole terminal for 2.5mm² (AWG 13), torque 1 Nm max. |
| Mounting | clip for 35mm DIN rail, EN 60715 |
| Casing | plastic according to UL94 V-0, light grey |
| Dimensions | 70 x 33 x 42mm |
| Weight | approx. 50g |
| Fitting position | variable |
| Operating / Storage temperature | -45 °C to +80 °C (-49 to +176°F) |
| Operating / Storage humidity | max. 90% RH (non-condensing) |
| Protection type | IP20 |
| Approvals | VDE + UL submitted |
¹ When connecting with 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 insurance
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 range | Art. No. Contact breaker (NC) | Art. No. Contact maker (NO) |
| 0 to +60°C | 01115.0-00 | 01116.0-00 |
| +32 to +140°F | 01115.9-00 | 01116.9-00 |
