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. 328-1101
Mfr. Part No.E5C2-R20K AC100-240 0-200
BrandOmron
MYR671.52
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. 613-7805
Mfr. Part No.701060/821-02
BrandJumo
MYR1,482.03
Each
units
Thermocouple 1 Relay - 1 230 V ac - - 0°C +55°C - - Panel Mount eTRON -
RS Stock No. 497-8963
Mfr. Part No.701060/811-02
BrandJumo
MYR727.79
Each
units
RTD 1 Relay - 1 230 V ac - 76 x 36mm 0°C +55°C 56mm - Panel Mount eTRON -
RS Stock No. 613-7798
Mfr. Part No.701540/831-02
BrandJumo
MYR481.44
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. 497-9017
Mfr. Part No.701060/811-05
BrandJumo
MYR673.36
Each
units
RTD 1 Relay - 1 115 V ac - - 0°C +55°C - - Panel Mount eTRON -
RS Stock No. 420-035
Mfr. Part No.DR4020 TCJ-K-R-S-T
BrandEliwell
MYR1,841.88
Each
units
Thermocouple - - - 90 240 V ac -40 +1600 °C 70 x 85mm -5°C +55°C 61mm - - DR 4000 -
RS Stock No. 809-0966
Mfr. Part No.IREVS0LN00
BrandCarel
MYR485.70
Each
units
NTC - - - 24 V ac - 76.2 x 34.7mm - - 79.5mm - - IR33+ -
RS Stock No. 328-1088
Mfr. Part No.E5C2-R20P-D AC100-240 -50-50
BrandOmron
MYR623.05
Each
units
RTD - - - 100 → 240 V ac -50 → +50 °C 48 x 48mm -10°C +55°C 86.7mm - - E5C2 -
RS Stock No. 809-1001
Mfr. Part No.IR33S0EN00
BrandCarel
MYR526.10
Each
units
NTC - - - 230 V ac - 76.2 x 34.4mm -10°C +60°C 70.5mm - - IR33 -
RS Stock No. 328-1173
Mfr. Part No.E5C2-R40K AC100-240 0-400
BrandOmron
MYR623.05
Each
units
K Type Thermocouple Relay - 1 100 → 240 V ac - 48 x 48 (1/16 DIN)mm -10°C +55°C 86.7mm IP00, IP40, IP66 - E5C2 -
RS Stock No. 894-6985
Mfr. Part No.RE55 0411008
BrandLumel
MYR666.58
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. 762-2137
Mfr. Part No.ID+971-12V+NTC
BrandEliwell
MYR763.27
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. 535-0710
Mfr. Part No.E5C2-R20K AC100-240 0-400
BrandOmron
MYR671.52
Each
units
K Type Thermocouple - - - 100 → 240 V ac 0 → 400 °C 48 x 48mm -10°C +55°C 86.7mm - - E5C2 -
RS Stock No. 746-3170
Mfr. Part No.E5LC6
BrandOmron
MYR1,839.19
Each
units
- - - - - - - - - - - - E5L -
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. 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. 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. 500-1036
Mfr. Part No.701050/821-02
BrandJumo
MYR660.79
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. 390-7904
Mfr. Part No.40T-48-4-00-RR-0-0-0-1
BrandGefran
MYR1,484.36
Each
units
Thermocouple PT100 Relay - 2 100 V ac, 240 V ac - 48 x 48mm - - 99mm IP65 - 40T48 -
RS Stock No. 481-7824
Mfr. Part No.PA201.004AX01
BrandBaumer
MYR534.91
Each
units
- - - - 100 → 300 V dc, 85 → 265 V ac - - - - - - - PA201 -
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