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. 746-3170
Mfr. Part No.E5LC6
BrandOmron
TWD10,800.00
Each
units
- - - - - - - - - - - - E5L -
RS Stock No. 877-1454
Mfr. Part No.IC+ 902 12V 8A + NTC
BrandEliwell
TWD2,514.00
Each
units
NTC, PTC Relay 1 1 12 V - 74 x 32mm -50°C +110°C 59mm IP65 Panel Mount ICPlus Screw
RS Stock No. 420-047
Mfr. Part No.DR4010 PTC+PTC
BrandEliwell
TWD8,853.00
Each
units
PTC - - - 90 240 V ac -55 +150 °C 70 x 85mm -5°C +55°C 61mm - - DR 4000 -
RS Stock No. 339-0132
Mfr. Part No.DTC410-02-MH
BrandTempatron
TWD5,347.00
Each
units
RTD - - - 90 260 V ac -99 +400 °C 48 x 48mm -10°C +50°C 84.5mm - - - -
RS Stock No. 791-5980
Mfr. Part No.6.564.010.000
BrandKubler
TWD7,274.00
Each
units
RTD, Thermocouple - - - 90 260 V ac - 96 x 48mm -20°C +65°C 90.5mm - - CODIX 564 -
RS Stock No. 328-1101
Mfr. Part No.E5C2-R20K AC100-240 0-200
BrandOmron
TWD5,810.00
Each
units
K Type Thermocouple - - - 100 240 V ac 0 200 °C 48 x 48mm -10°C +55°C 86.7mm - - E5C2 -
RS Stock No. 913-9927
Mfr. Part No.WE00S1EN00
BrandCarel
TWD6,499.00
Each
units
Digital 1 Relay 1 1 230 V ac - 290 x 128mm - - - IP65 Wall Mount - Screw
RS Stock No. 376-3704
Mfr. Part No.TC4810-05-110/230VAC
BrandTempatron
TWD4,016.00
Each
units
K Type Thermocouple Relay - 1 110 230 V ac - 48 x 48mm -10°C +50°C 89mm IP40 1/16 DIN - -
RS Stock No. 500-1036
Mfr. Part No.701050/821-02
BrandJumo
TWD4,205.00
Each
units
Thermocouple 1 Relay - 1 230 V ac 0 → 500 °C 90 x 22.5mm 0°C +500°C - - DIN Rail eTRON -
RS Stock No. 124-1076
BrandRS PRO
TWD1,878.00
Each
units
NTC - 1 - 24 V ac/dc -60 → +150 °C 77 x 35mm 0°C +50°C 61mm IP20, IP65 Panel Mount - Screw
RS Stock No. 875-1226
BrandRS PRO
TWD6,555.00
Each
units
Linear, RTD, Thermocouple Relay 1 2 24 V ac/dc - 72 x 72mm 0°C +50°C 87.5mm IP65, NEMA 4X 1/8 DIN RS PRO Screw
RS Stock No. 906-7721
Mfr. Part No.TSF-4040
TWD3,922.00
Each
units
S Type Thermocouple, Type J, Type K SPDT Relay 1 1 24 V ac/dc - 76.2 x 33.99mm 0°C +65°C 60.33mm IP64 Panel Mount TSF -
RS Stock No. 877-1466
Mfr. Part No.IC+ 902 230V 15A + NTC
BrandEliwell
TWD2,984.00
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. 497-8985
Mfr. Part No.701050/811-05
BrandJumo
TWD4,771.00
Each
units
RTD 1 Relay - 1 115 V ac - 93.5 x 22.5mm 0°C +55°C 61.6mm IP20 DIN Rail eTRON -
RS Stock No. 809-1023
Mfr. Part No.TC4810-02-24VAC/DC
BrandTempatron
TWD4,539.00
Each
units
Thermocouple - - - 24 V ac/dc - 48 x 48mm -10°C +50°C 89mm - 1/16 DIN - -
RS Stock No. 198-801
Mfr. Part No.LR09601-105
TWD3,730.00
Each
units
PT100 Relay 1 1 115 V ac, 230 V ac - 96 x 96mm -10°C +50°C 53mm IP50 Panel Mount STATOP -
RS Stock No. 198-839
Mfr. Part No.LR09604-100
TWD5,495.00
Each
units
Thermocouple Relay 1 1 90 260 V ac - 96 x 96mm -10°C +50°C 53mm IP50 Panel Mount STATOP -
RS Stock No. 762-2133
Mfr. Part No.ID+961-230V+NTC
BrandEliwell
TWD5,362.00
Each
units
NTC, PTC, RTD Digital 1 1 230 V -50 → +99 °C 74 x 32mm -5°C +55°C 60mm IP65 - IDPlus -
RS Stock No. 668-3036
Mfr. Part No.701530/888-22
BrandJumo
TWD7,723.00
Each
units
Current, RTD, Thermocouple, Voltage 1 Logic, 1 Relay - 2 20 53 V ac/dc -200 +850 °C 48 x 24mm 0°C +55°C 100mm - Panel Mount di 32 -
RS Stock No. 841-7958
Mfr. Part No.6.564.010.309
BrandKubler
TWD10,026.00
Each
units
MV, PT100, Resistance, Thermocouple - - - 10 30 V dc - 96 x 48mm -20°C +65°C 90.5mm - - CODIX 564 -