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 Priced to Clear Series
RS Stock No. 124-1059
BrandRS PRO
£57.59
Each
Units
J Type Thermocouple, K Type Thermocouple, R Type Thermocouple, S Type Thermocouple, T Type Thermocouple Relay 1 1 230 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 - -
RS Stock No. 124-1060
BrandRS PRO
£57.59
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 - -
RS Stock No. 124-1058
BrandRS PRO
£57.59
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 - -
RS Stock No. 124-1057
BrandRS PRO
£44.92
Each
Units
NTC Relay 1 - 230 V ac - 54 x 94mm 0°C +50°C 68mm IP65 DIN Rail - -
RS Stock No. 124-1049
BrandRS PRO
£59.84
Each
Units
NTC Relay 2 3 230 V ac -60 → +150 °C 77 x 35mm 0°C +50°C 61mm IP20, IP65 Panel Mount - -
RS Stock No. 875-1232
BrandRS PRO
£74.28
Each
Units
PT100 Relay 1 1 230 V ac 0 → +400 °C 96 x 96mm 0°C +50°C 96mm IP65, NEMA 4X 1/4 DIN - RS PRO
RS Stock No. 124-1052
BrandRS PRO
£64.82
Each
Units
J Type Thermocouple Relay 1 1 24 V ac -30 → +400 °C 77 x 35mm 0°C +50°C 61mm IP20, IP65 Panel Mount - -
RS Stock No. 124-1053
BrandRS PRO
£44.88
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 - -
RS Stock No. 124-1048
BrandRS PRO
£46.04
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 - -
RS Stock No. 875-1292
BrandRS PRO
£77.25
Each
Units
Digital Current 1 1 100 → 240 V ac - 72 x 72mm 0°C +50°C 95.5mm IP65, NEMA 4X 1/8 DIN - RS PRO
RS Stock No. 124-1045
BrandRS PRO
£44.88
Each
Units
NTC Relay 1 1 230 V ac -60 → +150 °C 77 x 35mm 0°C +50°C 61mm IP20, IP65 Panel Mount - -
RS Stock No. 124-1044
BrandRS PRO
£63.16
Each
Units
- Relay - 1 230 V ac - 96 x 96mm 0°C +400°C 50mm IP65 Panel Mount - -
RS Stock No. 124-1055
BrandRS PRO
£53.18
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 - -
RS Stock No. 124-1054
BrandRS PRO
£44.88
Each
Units
NTC Relay 1 1 230 V ac -60 → +150 °C 77 x 35mm 0°C +50°C 61mm IP20, IP65 Panel Mount - -
RS Stock No. 875-1214
BrandRS PRO
£163.42
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
RS Stock No. 124-1050
BrandRS PRO
£59.84
Each
Units
NTC Relay 2 3 24 V ac/dc -60 → +150 °C 77 x 35mm 0°C +50°C 61mm IP20, IP65 Panel Mount - -
RS Stock No. 124-1047
BrandRS PRO
£49.04
Each
Units
NTC Relay 1 2 230 V ac -60 → +150 °C 77 x 35mm 0°C +50°C 61mm IP20, IP65 Panel Mount - -
RS Stock No. 875-1226
BrandRS PRO
£152.70
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
RS Stock No. 124-1051
BrandRS PRO
£63.16
Each
Units
J Type Thermocouple Relay 1 1 230 V ac -30 → +400 °C 77 x 35mm 0°C +50°C 61mm IP20, IP65 Panel Mount - -
RS Stock No. 875-1239
BrandRS PRO
£65.36
Each
Units
J Type Thermocouple Relay 1 1 230 V ac 0 → +800 °C 72 x 72mm 0°C +50°C 95.5mm IP65, NEMA 4X 1/8 DIN - RS PRO
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