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. 511-7440
Mfr. Part No.IR33S0LR00
BrandCarel
$184.32
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. 511-7478
Mfr. Part No.IR33C0LR00
BrandCarel
$222.86
Each
units
NTC - - - 12 → 24 V ac -50 → +90 °C 76.2 x 34.2mm -10°C +50°C 94mm - - IR33 -
RS Stock No. 497-8991
Mfr. Part No.701050/811-02
BrandJumo
$267.83
Each
units
RTD 1 Relay - 1 230 V ac - 93.5 x 22.5mm 0°C +55°C 61.6mm IP20 DIN Rail eTRON -
RS Stock No. 535-0710
Mfr. Part No.E5C2-R20K AC100-240 0-400
BrandOmron
$237.45
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. 809-1007
Mfr. Part No.IR33S0ER00
BrandCarel
$266.28
Each
units
NTC - - - 115 → 230 V ac - 76.2 x 101mm -10°C +60°C 80mm - - IR33 -
RS Stock No. 124-1054
BrandRS PRO
$105.76
Each
units
NTC Relay 1 1 230 V ac -60 → +150 °C 77 x 35mm 0°C +50°C 61mm IP20, IP65 Panel Mount - Screw
RS Stock No. 809-0997
Mfr. Part No.PJEZS0G000
BrandCarel
$196.32
Each
units
NTC - - - 230 V ac - 81 x 36mm -10°C +50°C 58mm - - PJ Easy -
RS Stock No. 783-4724
Mfr. Part No.PZD0C0P001
BrandCarel
$220.59
Each
units
NTC - - - 115 V ac, 230 V ac - 81 x 36mm -10°C +50°C 58mm - - PZD -
RS Stock No. 913-9986
Mfr. Part No.PJEZY00000
BrandCarel
$124.05
Each
units
Digital 2 Relay 1 2 230 V ac - 81 x 36mm - - - IP65 Panel Mount - Screw
RS Stock No. 124-1075
BrandRS PRO
$85.78
Each
units
NTC - 1 - 230 V ac -60 → +150 °C 77 x 35mm 0°C +50°C 61mm IP20, IP65 Panel Mount - Screw
RS Stock No. 124-1076
BrandRS PRO
$80.49
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. 124-1045
BrandRS PRO
$72.98
Each
units
NTC Relay 1 1 230 V ac -60 → +150 °C 77 x 35mm 0°C +50°C 61mm IP20, IP65 Panel Mount - Screw
RS Stock No. 124-1048
BrandRS PRO
$78.57
Each
units
NTC Relay 1 2 24 V ac/dc -60 → +150 °C 77 x 35mm 0°C +50°C 61mm IP20, IP65 Panel Mount - Screw
RS Stock No. 124-1058
BrandRS PRO
$141.35
Each
units
PT100 Relay 1 2 230 V ac -200 → +600 (PT100) °C, -99.9 → +300 (PT100) °C 77 x 35mm 0°C +50°C 73mm IP20, IP65 Panel Mount - Screw
RS Stock No. 124-1060
BrandRS PRO
$122.03
Each
units
J Type Thermocouple, K Type Thermocouple, R Type Thermocouple, S Type Thermocouple, T Type Thermocouple Relay 1 1 24 V ac 0 → +1300 (K Type Thermocouple) °C, 0 → +1700 (R Type Thermocouple) °C, 0 → +1700 (S Type Thermocouple) °C, 0 → +400 (T Type Thermocouple) °C, 0 → +600 (J Type Thermocouple) °C 77 x 35mm 0°C +50°C 73mm IP20, IP65 Panel Mount - Screw
RS Stock No. 746-3170
Mfr. Part No.E5LC6
BrandOmron
$130.59
Each
units
- - - - - - - - - - - - E5L -
RS Stock No. 877-1454
Mfr. Part No.IC+ 902 12V 8A + NTC
BrandEliwell
$125.50
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. 809-1001
Mfr. Part No.IR33S0EN00
BrandCarel
$176.45
Each
units
NTC - - - 230 V ac - 76.2 x 34.4mm -10°C +60°C 70.5mm - - IR33 -
RS Stock No. 124-1053
BrandRS PRO
$72.26
Each
units
NTC Relay 1 1 24 V ac/dc -60 → +150 °C 77 x 35mm 0°C +50°C 61mm IP20, IP65 Panel Mount - Screw
RS Stock No. 877-1463
Mfr. Part No.IC+ 902 230V 8A + NTC
BrandEliwell
$125.34
Each
units
NTC, PTC Relay 1 1 230 V - 74 x 32mm -5°C +55°C 59mm IP65 Panel Mount ICPlus Screw
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