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. 511-7478
Mfr. Part No.IR33C0LR00
BrandCarel
MYR683.84
Each
units
NTC - - - 12 → 24 V ac -50 → +90 °C 76.2 x 34.2mm -10°C +50°C 94mm - - IR33 -
RS Stock No. 348-144
Mfr. Part No.FTST400K-110/240VAC
BrandTempatron
MYR580.12
Each
units
Thermocouple - - - 110 → 240 V ac 0 → +400 °C 48 x 48mm -10°C +50°C 112mm - - - -
RS Stock No. 500-1143
Mfr. Part No.701050/821-31
BrandJumo
MYR660.15
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. 877-1463
Mfr. Part No.IC+ 902 230V 8A + NTC
BrandEliwell
MYR526.70
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. 877-1454
Mfr. Part No.IC+ 902 12V 8A + NTC
BrandEliwell
MYR413.34
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. 479-6698
Mfr. Part No.ID 985 LX-12V-8A-PTC
BrandEliwell
MYR1,222.29
Each
units
PTC Relay - 4 12 V ac/dc -50 → +140 °C 74 x 32mm -5°C +55°C 60mm IP65 Panel Mount ID 985LX Screw
RS Stock No. 877-1466
Mfr. Part No.IC+ 902 230V 15A + NTC
BrandEliwell
MYR463.65
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. 511-7440
Mfr. Part No.IR33S0LR00
BrandCarel
MYR518.06
Each
units
NTC - - - 12 → 24 V ac/dc -50 → +90 °C 76.2 x 34.2mm -10°C +50°C 94mm - - IR33 -
RS Stock No. 500-1165
Mfr. Part No.701060/832-31
BrandJumo
MYR732.07
Each
units
Current 2 Relay - 2 12 → 24 V dc, 24 V ac - 76 x 36mm 0°C +55°C 56mm - Panel Mount eTRON -
RS Stock No. 913-9986
Mfr. Part No.PJEZY00000
BrandCarel
MYR487.20
Each
units
Digital 2 Relay 1 2 230 V ac - 81 x 36mm - - - IP65 Panel Mount - Screw
RS Stock No. 745-7942
Mfr. Part No.PJEZS0A000
BrandCarel
MYR520.08
Each
units
NTC - - - 230 V ac -50 → +90 °C 36 x 81mm - - 61mm - - PJ Easy -
RS Stock No. 328-1101
Mfr. Part No.E5C2-R20K AC100-240 0-200
BrandOmron
MYR647.69
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. 613-7798
Mfr. Part No.701540/831-02
BrandJumo
MYR772.91
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. 497-8963
Mfr. Part No.701060/811-02
BrandJumo
MYR732.07
Each
units
RTD 1 Relay - 1 230 V ac - 76 x 36mm 0°C +55°C 56mm - Panel Mount eTRON -
RS Stock No. 613-7805
Mfr. Part No.701060/821-02
BrandJumo
MYR1,607.88
Each
units
Thermocouple 1 Relay - 1 230 V ac - - 0°C +55°C - - Panel Mount eTRON -
RS Stock No. 420-035
Mfr. Part No.DR4020 TCJ-K-R-S-T
BrandEliwell
MYR2,064.86
Each
units
Thermocouple - - - 90 → 240 V ac -40 → +1600 °C 70 x 85mm -5°C +55°C 61mm - - DR 4000 -
RS Stock No. 762-2137
Mfr. Part No.ID+971-12V+NTC
BrandEliwell
MYR855.67
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. 875-1214
BrandRS PRO
MYR1,090.06
Each
units
Linear, RTD, Thermocouple Relay 1 2 100 → 240 V ac - 48 x 96mm 0°C +50°C 86.6mm IP65, NEMA 4X 1/8 DIN (H) RS PRO Screw
RS Stock No. 535-0710
Mfr. Part No.E5C2-R20K AC100-240 0-400
BrandOmron
MYR630.34
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. 328-1173
Mfr. Part No.E5C2-R40K AC100-240 0-400
BrandOmron
MYR647.69
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 -