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RTKSA-204.200

Frost protection thermostat, 6 m, IP40, hysteresis 1.5 K, STW, indoor setting

The RTKSA frost protection regulators have been specially developed for air or water-side frost protection of hot water heating coils and heat exchangers in ventilation, heating or air conditioning systems. The capillaries are active along their entire length. The device responds when the minimum response length of the capillary (30 cm) reaches the set scale value. In the event of a sensor break, contact 1-2 is permanently open and contact 1-4 is permanently closed. Unlocking is no longer possible. Note: Mounting clamps, thermowells and protective coils are not included in the scope of delivery and must be ordered separately. Air-side application: For frost protection of heating registers, the capillary is clamped in front of the heating register to be protected with mounting clamps. The JZ-05/6M (metal) or JZ-05/6 K (plastic) mounting clamps must be used for this purpose.


Number of outputs2, 2
Number of control ranges1
Output signalswitching
External settingNo
Operationinternal setpoint adjuster
Electric connectionPush-in clamp
Electronic controlNo
With explosion protectionNo
Colouranthracite
Sensor elementcapillary tube
Function type (systems engineering)STB
Device versionsurface-mounted unit
Internal settingYes
Contact interlockingNo
Bearing temperature–30 … 80 °C
Capillary length6 m
Max. air humidity (non-condensing)95 % r.H.
Sensor materialCu
Max. Sensor temperature120 °C
Max. switching voltage230 VAC, 50/60 Hz / 230 VDC
Max. switching current16 (2,5) A, 0,25 A
Min. switching voltage24 VAC, 50 Hz / 24 VDC
Min. switching currentat 24 V (AC/DC) min. 100 mA
Mounting/attachment
Control range-10 … 15 °C, -10 … 15 °C
Heating control functionYes
Cooling control functionYes
Switching differentialHeating/cooling: 1,5 K
Switching difference, can be adjustedNo
Switching element
Switching contacttwo-way contact
Potential free switching contactYes
Protection classIP40
Protection classI
Safety and EMCin accordance with DIN EN 60730
ScaleDegree Celsius
Dimensions (W x H x D)53 mm x 146,8 mm x 62,9 mm

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