On / Off Temperature Controllers

On-off temperature controllers (also called signallers), are simple temperature control devices. An optimal temperature is preset and when it's exceeded the output switches off. When the temperature falls below the optimal preset, the output switches on. The output value has only an 'on' or 'off' option, with no middle state.

What are on-off temperature controllers used for?

On-off temperature controllers are used for monitoring purposes in heating environments. They prevent rapid increases in temperature that may cause damage to contactors and valves by cutting off the power. These controllers are often used where there isn't a need for precision temperature control. They are beneficial in applications where the system can't handle continuous interruptions. On-off controllers are found in temperature alarms and thermostats.

Types of on-off temperature controllers

A typical example of an on-off temperature controller is the thermostat in a heating system. If the temperature drops below the preset level, the heating system will switch on, and vice versa. Another example is that of a limit controller. It protects a system against overheating or overcooling by shutting down the power if the temperature exceeds a preset level.


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Description Price Input Type Output Type Number of Inputs Number of Outputs Supply Voltage Range Size Minimum Operating Temperature Maximum Operating Temperature Panel Depth IP Rating Mounting Type Series Termination Type
RS Stock No. 914-8482
Mfr. Part No.SRT-N118-1A21-1-4-001
BrandSimex
TWD8,377.00
Each
units
Thermocouple Relay 3 2 230 V ac -210 → +1200 (Type J) °C, -200 → +1000 (Type E) °C, -200 → +1300 (Type N) °C, -200 → +1370 (Type K) °C, -200 → +400 (Type T) °C, -50 → +1768 (Type R) °C, -50 → +1768 (Type S) °C, +250 → +1820 (Type B) °C 110 x 80mm 0°C +50°C 67mm IP67 Wall Mount - Screw
RS Stock No. 467-131
Mfr. Part No.701061/822-32/000
BrandJumo
TWD9,509.00
Each
units
RTD 4 Relay - 3 12 24 V ac/dc - 76 x 36 mmmm 0°C +55°C - - Panel Mount eTRON M100 -
RS Stock No. 497-8979
Mfr. Part No.701050/811-31
BrandJumo
TWD4,404.00
Each
units
RTD 1 Relay - 1 12 → 24 V dc - 93.5 x 22.5mm 0°C +55°C 61.6mm IP20 DIN Rail eTRON -
RS Stock No. 497-9017
Mfr. Part No.701060/811-05
BrandJumo
TWD4,958.00
Each
units
RTD 1 Relay - 1 115 V ac - - 0°C +55°C - - Panel Mount eTRON -
RS Stock No. 809-1039
Mfr. Part No.TC4830-54-110/230VAC
BrandTempatron
TWD3,241.00
Each
units
PT100 - - - 110 → 230 V ac - 48 x 48mm -10°C +50°C 89mm - 1/16 DIN - -
RS Stock No. 124-1050
BrandRS PRO
TWD2,704.00
Each
units
NTC Relay 2 3 24 V ac/dc -60 → +150 °C 77 x 35mm 0°C +50°C 61mm IP20, IP65 Panel Mount - Screw
New
RS Stock No. 198-1173
BrandRS PRO
TWD4,078.00
Each
units
Thermocouple Analogue Relay - 2 - - 48 mm x 48 mm - - - - - - -
RS Stock No. 809-1032
Mfr. Part No.TC4830-03-110/230VAC
BrandTempatron
TWD3,324.00
Each
units
K Type Thermocouple - - - 110 → 230 V ac - 48 x 48mm -10°C +50°C 89mm - 1/16 DIN - -
RS Stock No. 877-1479
Mfr. Part No.IC+ 915 230V 8A TCJ/K PT100
BrandEliwell
TWD4,997.00
Each
units
RTD, Thermocouple Digital, Relay 1 2 230 V - 74 x 32mm -5°C +55°C 59mm IP65 Panel Mount ICPlus Screw
RS Stock No. 339-0097
Mfr. Part No.DTC410-01-MH
BrandTempatron
TWD5,601.00
Each
units
Thermocouple - - - 90 → 260 V ac -99 → +999 °C 48 x 48mm -10°C +50°C 84.5mm - - - -
RS Stock No. 117-6659
Mfr. Part No.EMPLUS 600 NTC-PTC 230Vac
BrandEliwell
TWD2,930.00
Each
units
Analogue - 1 - 230 V - 74 x 32mm -5°C +55°C 59mm - Panel Mount EMPLUS 600 Lead Wire
RS Stock No. 344-568
Mfr. Part No.TC4810-04-110/240VAC
BrandTempatron
TWD3,902.00
Each
units
K Type Thermocouple - - - 110 240 V ac 0 +800 °C 48 x 48mm -10°C +50°C 89mm - 1/16 DIN - -
RS Stock No. 809-1048
Mfr. Part No.FTST200K-110/240VAC
BrandTempatron
TWD4,032.00
Each
units
K Type Thermocouple - - - 230 V ac - 48 x 48mm -10°C +50°C 112mm - - - -
RS Stock No. 500-1143
Mfr. Part No.701050/821-31
BrandJumo
TWD4,404.00
Each
units
Thermocouple 1 Relay - 1 12-24 V dc, 24 V ac 0 → 500 °C 90 x 22.5mm 0°C +500°C - - DIN Rail eTRON -
RS Stock No. 509-0884
Mfr. Part No.DR 985 PTC
BrandEliwell
TWD10,370.00
Each
units
PTC - - - 230 V ac - 70 x 85mm -5°C +55°C 61mm - - DR 985 -
RS Stock No. 894-6985
Mfr. Part No.RE55 0411008
BrandLumel
TWD5,037.00
Each
units
PT100/1 Relay, Transistor 1 1 85 253 V ac/dc 0 +250 °C 96 x 96mm 0°C +50°C 65mm IP20, IP40 Panel Mount RE55 Plug-In, Screw
RS Stock No. 877-1463
Mfr. Part No.IC+ 902 230V 8A + NTC
BrandEliwell
TWD2,848.00
Each
units
NTC, PTC Relay 1 1 230 V - 74 x 32mm -5°C +55°C 59mm IP65 Panel Mount ICPlus Screw
RS Stock No. 809-0991
Mfr. Part No.DN33Z9MR20
BrandCarel
TWD7,724.00
Each
units
NTC, PT100, PTC - - 4 24 V ac, 30 V dc Carel DN33 110 x 70mm -10°C +60°C 60mm - - DN33 -
RS Stock No. 613-7798
Mfr. Part No.701540/831-02
BrandJumo
TWD5,156.00
Each
units
Current 1 Relay - 1 230 V ac - 76 x 36 mmmm 0°C +55°C - IP20, IP65 Panel Mount di eco -
RS Stock No. 798-4104
Mfr. Part No.40T-72-4-01-RR-00-9
BrandGefran
TWD10,415.00
Each
units
Thermocouple Relay - 2 11 27 V dc, 18 27 V ac - 72 x 36mm 0°C +50°C 54mm IP65 - 40T72 -