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. 798-4104
Mfr. Part No.40T-72-4-01-RR-00-9
BrandGefran
HK$2,649.62
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. 467-181
Mfr. Part No.701061/800-32/000
BrandJumo
HK$1,459.52
Each
units
RTD 3 Relay - 4 12 24 V ac/dc - 76 x 36 mmmm 0°C +55°C - - Panel Mount eTRON M100 -
RS Stock No. 809-1023
Mfr. Part No.TC4810-02-24VAC/DC
BrandTempatron
HK$1,155.21
Each
units
Thermocouple - - - 24 V ac/dc - 48 x 48mm -10°C +50°C 89mm - 1/16 DIN - -
RS Stock No. 809-1039
Mfr. Part No.TC4830-54-110/230VAC
BrandTempatron
HK$853.20
Each
units
PT100 - - - 110 → 230 V ac - 48 x 48mm -10°C +50°C 89mm - 1/16 DIN - -
RS Stock No. 437-0909
Mfr. Part No.40T96-4-00-RR00-301 (EX 40T96-4-00-RR031
BrandGefran
HK$3,155.50
Each
units
- Relay - 1 100 240 V ac/dc Gefran 40 96 x 48mm - - 92mm IP65 - 40T96 -
RS Stock No. 877-1463
Mfr. Part No.IC+ 902 230V 8A + NTC
BrandEliwell
HK$724.72
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. 509-0884
Mfr. Part No.DR 985 PTC
BrandEliwell
HK$2,638.41
Each
units
PTC - - - 230 V ac - 70 x 85mm -5°C +55°C 61mm - - DR 985 -
RS Stock No. 124-1058
BrandRS PRO
HK$658.80
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. 809-0957
Mfr. Part No.PJS5C0HF00
BrandCarel
HK$1,065.64
Each
units
NTC - - - 115 V ac - 59 x 67mm -10°C +50°C 156mm - - Easy XL -
RS Stock No. 420-035
Mfr. Part No.DR4020 TCJ-K-R-S-T
BrandEliwell
HK$3,541.37
Each
units
Thermocouple - - - 90 240 V ac -40 +1600 °C 70 x 85mm -5°C +55°C 61mm - - DR 4000 -
RS Stock No. 198-845
Mfr. Part No.LR09601-100
HK$1,035.32
Each
units
J Type Thermocouple Relay 1 1 115 V ac, 230 V ac - 96 x 96mm -10°C +50°C 53mm IP50 Panel Mount STATOP -
RS Stock No. 906-7728
Mfr. Part No.TSS2-2400
HK$806.98
Each
units
NTC, PTC SPDT Relay 1 2 24 V ac/dc - 76.2 x 36.12mm 0°C +70°C 61.91mm IP64 Panel Mount TSS2 -
RS Stock No. 809-1001
Mfr. Part No.IR33S0EN00
BrandCarel
HK$1,011.52
Each
units
NTC - - - 230 V ac - 76.2 x 34.4mm -10°C +60°C 70.5mm - - IR33 -
RS Stock No. 809-1041
Mfr. Part No.FTST1200K-110/240VAC
BrandTempatron
HK$1,025.71
Each
units
K Type Thermocouple - - - 230 V ac - 48 x 48mm -10°C +50°C 112mm - - - -
RS Stock No. 809-1017
Mfr. Part No.TC4810-53-110/230VAC
BrandTempatron
HK$1,099.04
Each
units
PT100 - - - 110 → 230 V ac - 48 x 48mm -10°C +50°C 89mm - 1/16 DIN - -
RS Stock No. 809-0953
Mfr. Part No.PJS5C0HE00
BrandCarel
HK$1,111.57
Each
units
NTC - - - 230 V ac - 59 x 67mm -10°C +50°C 156mm - - Easy XL -
RS Stock No. 500-1036
Mfr. Part No.701050/821-02
BrandJumo
HK$1,120.43
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. 875-1232
BrandRS PRO
HK$849.76
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 Screw
RS Stock No. 913-9983
Mfr. Part No.PJEZC0M000
BrandCarel
HK$1,326.12
Each
units
Digital 3 Relay 1 3 230 V ac - 81 x 36mm - - - IP65 Panel Mount - Screw
RS Stock No. 124-1048
BrandRS PRO
HK$526.71
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
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