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. 877-1454
Mfr. Part No.IC+ 902 12V 8A + NTC
BrandEliwell
TWD2,634.00
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. 791-5980
Mfr. Part No.6.564.010.000
BrandKubler
TWD7,619.00
Each
units
RTD, Thermocouple - - - 90 260 V ac - 96 x 48mm -20°C +65°C 90.5mm - - CODIX 564 -
RS Stock No. 328-1101
Mfr. Part No.E5C2-R20K AC100-240 0-200
BrandOmron
TWD4,366.00
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. 913-9927
Mfr. Part No.WE00S1EN00
BrandCarel
TWD5,432.00
Each
units
Digital 1 Relay 1 1 230 V ac - 290 x 128mm - - - IP65 Wall Mount - Screw
RS Stock No. 339-0132
Mfr. Part No.DTC410-02-MH
BrandTempatron
TWD5,601.00
Each
units
RTD - - - 90 → 260 V ac -99 → +400 °C 48 x 48mm -10°C +50°C 84.5mm - - - -
RS Stock No. 746-3170
Mfr. Part No.E5LC6
BrandOmron
TWD3,573.00
Each
units
- - - - - - - - - - - - E5L -
RS Stock No. 420-047
Mfr. Part No.DR4010 PTC+PTC
BrandEliwell
TWD9,273.00
Each
units
PTC - - - 90 240 V ac -55 +150 °C 70 x 85mm -5°C +55°C 61mm - - DR 4000 -
RS Stock No. 762-2137
Mfr. Part No.ID+971-12V+NTC
BrandEliwell
TWD5,768.00
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. 875-1264
BrandRS PRO
TWD2,430.00
Each
units
Thermocouple SSR 1 1 230 V ac 0 → +800 °C 35 x 77mm 0°C +50°C 62.5mm IP65, NEMA 4X 1/16 DIN RS PRO Screw
RS Stock No. 762-2146
Mfr. Part No.ID+971-230V+NTC
BrandEliwell
TWD9,280.00
Each
units
NTC, PTC, RTD Digital 2 1 230 V -55 → +140 °C 74 x 32mm -5°C +55°C 60mm IP65 - IDPlus -
RS Stock No. 798-4104
Mfr. Part No.40T-72-4-01-RR-00-9
BrandGefran
TWD10,415.00
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. 875-1267
BrandRS PRO
TWD2,538.00
Each
units
RTD, Thermocouple Relay 1 1 230 V ac -50 → +100 °C 35 x 77mm 0°C +50°C 62.5mm IP65, NEMA 4X 1/16 DIN RS PRO Screw
RS Stock No. 762-2149
Mfr. Part No.ID+974-12V+NTC
BrandEliwell
TWD8,879.00
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. 809-0966
Mfr. Part No.IREVS0LN00
BrandCarel
TWD3,671.00
Each
units
NTC - - - 24 V ac - 76.2 x 34.7mm - - 79.5mm - - IR33+ -
RS Stock No. 809-0988
Mfr. Part No.IREVF0EN00
BrandCarel
TWD4,508.00
Each
units
NTC - - - 230 V ac - 76.2 x 34.7mm - - 79.5mm - - IR33+ -
RS Stock No. 875-1214
BrandRS PRO
TWD7,348.00
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. 442-0694
Mfr. Part No.6.531.012.300
BrandKubler
TWD4,764.00
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. 198-637
Mfr. Part No.LR04841-100
TWD3,873.00
Each
units
J Type Thermocouple Relay 1 1 200 260 V ac - 48 x 48 (1/16 DIN)mm -10°C +50°C 86mm IP50 Panel Mount STATOP -
RS Stock No. 745-7945
Mfr. Part No.PJEZS6P000
BrandCarel
TWD3,342.00
Each
units
PTC - - - 230 V ac -50 → +90 °C 36 x 81mm - - 61mm - - PJ Easy -
RS Stock No. 339-0097
Mfr. Part No.DTC410-01-MH
BrandTempatron
TWD5,601.00
Each
units
Thermocouple - - - 90 → 260 V ac -99 → +999 °C 48 x 48mm -10°C +50°C 84.5mm - - - -