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. 877-1479
Mfr. Part No.IC+ 915 230V 8A TCJ/K PT100
BrandEliwell
MYR661.16
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. 328-1139
Mfr. Part No.E5C2-R20K AC100-240 0-600
BrandOmron
MYR671.52
Each
units
K Type Thermocouple - - - 100 240 V ac 0 600 °C 48 x 48mm -10°C +55°C 86.7mm - - E5C2 -
RS Stock No. 442-0694
Mfr. Part No.6.531.012.300
BrandKubler
MYR650.21
Each
units
Ni100, PT100 - - - 10 30 V dc - 48 x 24 (1/32 DIN)mm -20°C +65°C 59mm IP65 - CODIX 531 -
RS Stock No. 746-3170
Mfr. Part No.E5LC6
BrandOmron
MYR471.41
Each
units
- - - - - - - - - - - - E5L -
RS Stock No. 906-7728
Mfr. Part No.TSS2-2400
MYR419.71
Each
units
NTC, PTC SPDT Relay 1 2 24 V ac/dc - 76.2 x 36.12mm 0°C +70°C 61.91mm IP64 Panel Mount TSS2 -
RS Stock No. 339-0097
Mfr. Part No.DTC410-01-MH
BrandTempatron
MYR810.34
Each
units
Thermocouple - - - 90 260 V ac -99 +999 °C 48 x 48mm -10°C +50°C 84.5mm - - - -
RS Stock No. 798-4104
Mfr. Part No.40T-72-4-01-RR-00-9
BrandGefran
MYR1,378.08
Each
units
Thermocouple Relay - 2 11 27 V dc, 18 27 V ac - 72 x 36mm 0°C +50°C 54mm IP65 - 40T72 -
RS Stock No. 339-0132
Mfr. Part No.DTC410-02-MH
BrandTempatron
MYR810.34
Each
units
RTD - - - 90 260 V ac -99 +400 °C 48 x 48mm -10°C +50°C 84.5mm - - - -
RS Stock No. 339-0075
Mfr. Part No.DTC410-01-ML
BrandTempatron
MYR810.34
Each
units
Thermocouple - - - 10 32 V ac/dc -99 +999 °C 48 x 48mm -10°C +50°C 84.5mm - - - -
RS Stock No. 809-0975
Mfr. Part No.IREVC7HN00
BrandCarel
MYR842.64
Each
units
NTC - - - 230 V ac - 76.2 x 34.7mm - - 79.5mm - - IR33+ -
RS Stock No. 809-0988
Mfr. Part No.IREVF0EN00
BrandCarel
MYR617.43
Each
units
NTC - - - 230 V ac - 76.2 x 34.7mm - - 79.5mm - - IR33+ -
RS Stock No. 535-0754
Mfr. Part No.E5C2-R20K AC100-240 0-800
BrandOmron
MYR671.52
Each
units
K Type Thermocouple - - - 100 240 V ac 0 800 °C 48 x 48mm -10°C +55°C 86.7mm - - E5C2 -
RS Stock No. 497-8985
Mfr. Part No.701050/811-05
BrandJumo
MYR582.74
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. 913-9977
Mfr. Part No.PB00Y0EV30
BrandCarel
MYR623.73
Each
units
- 3 Relay 1 3 230 V ac - - - - - - Panel Mount - Screw
RS Stock No. 500-1092
Mfr. Part No.701060/822-31
BrandJumo
MYR932.28
Each
units
J L K Thermocouple 2 Relay - 2 24 V ac, 12 24 V dc - - 0°C +55°C - - Panel Mount eTRON -
RS Stock No. 762-2149
Mfr. Part No.ID+974-12V+NTC
BrandEliwell
MYR1,174.95
Each
units
NTC, PTC, RTD Digital 2 1 12 V -55 → +140 °C 74 x 32mm -5°C +55°C 60mm IP65 - IDPlus -
RS Stock No. 809-0979
Mfr. Part No.IREVS0EN00
BrandCarel
MYR572.16
Each
units
NTC - - - 230 V ac - 76.2 x 34.7mm - - 79.5mm - - IR33+ -
RS Stock No. 745-7933
Mfr. Part No.PJEZS0P000
BrandCarel
MYR446.57
Each
units
NTC - - - 230 V ac -50 → +90 °C 36 x 81mm - - 61mm - - PJ Easy -
RS Stock No. 535-0811
Mfr. Part No.E5C2-R40K AC100-240 0-800
BrandOmron
MYR622.62
Each
units
K Type Thermocouple Relay - 1 100 240 V ac - 48 x 48mm -10°C +55°C 86.7mm IP00, IP40, IP66 - E5C2 -
RS Stock No. 746-3111
Mfr. Part No.E5C2-R20J AC100-240 0-200
BrandOmron
MYR671.52
Each
units
J Type Thermocouple - - - 100 240 V ac 0 +200 °C 48 x 48mm - - 86.7mm - - E5C2 -
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