Thermostats & Hygrostats for Electrical Enclosures

Control type temperature, relative humidity, temperature and relative humidity

Choose temperature, humidity or combined control before comparing the model code.

Contact logic NO and NC in one casing; NC heater side and NO fan/cooling side, normally open contact closes above set temperature for cooling/fan control

Match NO, NC or change-over output to the heater, fan, alarm or humidity-control circuit.

Load check 25A AC, 10A available, min 20V AC/DC 100mA; max 250V AC 5A

Review voltage and switching current before connecting heaters, fans or signal loads.

Wiring check 4-pole terminal; terminals 11/12 and 23/24; max clamping torque 0.5Nm, 2-pole product drawing; table family wording mentions 4-pole terminal; max clamping torque 0.5Nm

Compare terminal count, wiring photo and DIN-rail space for replacement work.

Heater control

Start with NC thermostat or humidity-control logic when the heater should switch on during cold or damp conditions.

heaterNC contacthumidity risk

Fan or filter fan control

Use NO temperature control when a fan or cooling load should start after cabinet temperature rises.

fan loadNO contacttemperature setpoint

Combined control

Use dual or electronic control paths when one cabinet needs heating, ventilation and humidity review together.

change-overdual dialDIN rail

Thermostat and hygrostat comparison

Model	Device type	Contact logic	Setting range	Switching capacity	Connection
SG.ZR011	dual thermostat	NO and NC in one casing; NC heater side and NO fan/cooling side	two separate adjustable temperature dials available, approx 0C-60C scale	25A AC, 10A available	4-pole terminal; terminals 11/12 and 23/24; max clamping torque 0.5Nm
SG.KTS011 (NO)	mechanical thermostat	normally open contact closes above set temperature for cooling/fan control	single adjustable temperature dial available, approx 0C-60C scale	25A AC, 10A available	2-pole product drawing; table family wording mentions 4-pole terminal; max clamping torque 0.5Nm
SG.KTO011 (NC)	mechanical thermostat	normally closed contact closes below set temperature for heater control	single adjustable temperature dial available, approx 0C-60C scale	25A AC, 10A available	2-pole product drawing; table family wording mentions 4-pole terminal; max clamping torque 0.5Nm
SG.MFR012	mechanical hygrostat	change-over snap-action contact	adjustable relative humidity dial available, approx 20%-90%RH scale	min 20V AC/DC 100mA; max 250V AC 5A	3-pole terminal; max clamping torque 0.5Nm
SG.ETF012	electronic hygrotherm	change-over relay; NC and NO output capacities available	temperature and humidity adjustable; two dials available	NC 240V AC 6(1)A; NO 240V AC 8(1.6)A; NC 120V AC 6(1)A; NO 120V AC 8(1.6)A; 24V DC 4A	5-pole terminal; max clamping torque 0.5Nm
SG.ETR011	electronic thermostat	change-over relay	large setting range; dial appears approx -40C to +60C	240V AC 8(1.6)A; 120V AC 8(1.6)A; 24V DC 4A	5-pole terminal; max clamping torque 0.5Nm
SG.EFR012	electronic hygrostat	change-over relay	adjustable and preset relative humidity; dial appears approx 40%-90%RH	240V AC 8(1.6)A; 120V AC 8(1.6)A; 24V DC 4A; AC/DC 100W at 24V DC line available	5-pole terminal; max clamping torque 0.5Nm

Model range at a glance

Compare available models by voltage, output, airflow, dimensions and application notes, then send the exact model and project conditions for quotation.

7models

22spec categories

Quotedetails

Docsrequest

Voltage

240V AC / 120V AC / 24V DC relay-output options available20V AC/DC minimum switching capacity available; max 250V AC240V AC / 120V AC / 24V AC/DC relay-output options available

Power

relay output: 240V AC 8(1.6)A; 120V AC 8(1.6)A; 24V DC 4A; AC/DC 100W at 24V DC line availablemax switching capacity 25A AC; 10A availablemin switching capacity 20V AC/DC 100mA; max switching capacity 250V AC 5Arelay output: NC 240V AC 6(1)A; NO 240V AC 8(1.6)A; NC 120V AC 6(1)A; NO 120V AC 8(1.6)A; 24V DC 4Arelay output: 240V AC 8(1.6)A; 120V AC 8(1.6)A; 24V DC 4A

Airflow

permissible air velocity 15m/sec

Dimensions

64.5x42x38mm67x50x46mm60x33x43mm67x50x38mm77x60x43mm

IP / environment

IP20IP20 / class II

Applications

electronic hygrostat for relative humidity control of a connected heater to reduce condensation riskdual thermostat for separate heater and fan/cooling control in one enclosurenormally open thermostat for fan, cooling equipment or signal device control when temperature rises above setpointnormally closed thermostat for cabinet heater control when temperature falls below setpointmechanical hygrostat for condensation prevention by controlling heaters or fans around relative humidity setpointelectronic hygrotherm for temperature and humidity control of heaters or fans to reduce condensation risk

Best-fit buying situations

fan controlheater controlhumidity responsetemperature and humidity control cabinet

Series Quote details

controlled deviceNO or NC contactswitching capacitytemperature or humidity rangemounting methodwiring requirementquantity

Purchasing notes

Choose thermostat for temperature and hygrostat for humidity.
NO/NC logic must match the load behavior.
Check switching capacity before wiring to fans or heaters.

Documents to request

datasheetwiring diagramcontact ratingmounting information

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