220v Temperature Controller Digital Thermostat Microcomputer Refrigeration Cooling Defrosting Controller for Freezer Display

220v Temperature Controller Digital Thermostat Microcomputer Refrigeration Cooling Defrosting Controller for Freezer DisplaySH-251C: Non-touch screen, Dual Sensor, 30ASH3B21: Touchscreen, Single Sensor, 16ASH3B23: Touchscreen, Dual Sensor, 16ASH-251C:Power supply: 230VAC+10% 50/60HzRated current of the relays: 30A/250VACUse temperature:-5°C~55°CRelative humidity:10%~90% RH (not condensing)Storage temperature: -30°C~85°CProduct: Length 81x Width 36 x Depth 76(mm)Mounting size: Length 71 x Width 29 (mm)Temperature controlling range: NTC probe: -50...150°C(-50...302°F)Display resolution: 1°C/0.1°C (With the switch mode between integer and decimal)Accuracy: NTC: +0.5°C(-30°C-50°C),others,+1°CProbe type: NTC(-50°C~150°C)SH3B21:Power supply: 230 VAC (+10 % -15%), 50... 60 Hz(±3 Hz), 2 VA.Rated current of the relays: 16A/250VACDimensions: 78.0 x 36.0 x 37.0 mmShell protection rating: IP54Operating temperature: from 0 to 55 °C (from 32 to 131°F).Storage temperature: from -25 to 70 °C (from -13 to 158°F).Humidity for use: from 10 to 90 % relative humidity without condensate.SH3B23:Power supply: 230 VAC (+10 % -15%), 50... 60 Hz(±3 Hz), 2 VA.Rated current of the relays: 16A/250VACShell protection rating: IP54Operating temperature: from 0 to 55 °C (from 32 to 131°F).Storage temperature: from -25 to 70 °C (from -13 to158 °F).Humidity for use: from 10 to 90 % relative humidity without condensate.