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. 500-1092
Mfr. Part No.701060/822-31
BrandJumo
HK$1,294.66
Each
units
J L K Thermocouple 2 Relay - 2 12 → 24 V dc, 24 V ac - - 0°C +55°C - - Panel Mount eTRON -
RS Stock No. 339-0104
Mfr. Part No.DTC410-02-ML
BrandTempatron
HK$1,424.97
Each
units
RTD - - - 10 32 V ac/dc -99 +400 °C 48 x 48mm -10°C +50°C 84.5mm - - - -
RS Stock No. 613-7782
Mfr. Part No.701540/821-02
BrandJumo
HK$953.98
Each
units
Thermocouple 1 Relay - 1 230 V ac - 76 x 36 mmmm 0°C +55°C - IP20, IP65 Panel Mount di eco -
RS Stock No. 500-1165
Mfr. Part No.701060/832-31
BrandJumo
HK$1,294.66
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. 877-1466
Mfr. Part No.IC+ 902 230V 15A + NTC
BrandEliwell
HK$798.97
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. 348-1761
Mfr. Part No.40T-48-4-00-RR-0-0-0-0
BrandGefran
HK$2,735.19
Each
units
- Relay - 2 11 27 V ac/dc - 48 x 48mm - - 99mm IP65 - 40T48 -
RS Stock No. 390-7932
Mfr. Part No.40T96-4-00-RR00-001 (EX 40T96-4-00-RR001
BrandGefran
HK$2,835.75
Each
units
- Relay - - 100 240 V ac - 108 x 48mm - - 105mm IP65 - 40T96 -
RS Stock No. 437-0915
Mfr. Part No.40T96-4-24-RRR0-301 (EX 40T96-4-24-RRR31
BrandGefran
HK$3,645.81
Each
units
- Relay - 3 100 240 V ac/dc Gefran 40 108 x 48mm - - 105mm IP65 - 40T96 -
RS Stock No. 746-3114
Mfr. Part No.E5C2-R20J AC100-240 0-300
BrandOmron
HK$1,110.82
Each
units
J Type Thermocouple - - - 100 → 240 V ac 0 → +300 °C 48 x 48mm - - 86.7mm - - E5C2 -
RS Stock No. 500-1115
Mfr. Part No.701060/822-02
BrandJumo
HK$1,294.66
Each
units
J L K Thermocouple 2 Relay - 2 230 V ac - - 0°C +55°C - - Panel Mount eTRON -
RS Stock No. 668-3033
Mfr. Part No.701531/888-25
BrandJumo
HK$2,776.83
Each
units
Current, RTD, Thermocouple, Voltage 1 Logic, 2 Relay - 3 20 → 30 V ac/dc -200 → +850 °C 48 x 96mm 0°C +55°C 100mm - Panel Mount di 08 -
RS Stock No. 906-7721
Mfr. Part No.TSF-4040
HK$1,040.58
Each
units
S Type Thermocouple, Type J, Type K SPDT Relay 1 1 24 V ac/dc - 76.2 x 33.99mm 0°C +65°C 60.33mm IP64 Panel Mount TSF -
RS Stock No. 124-1050
BrandRS PRO
HK$687.86
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 - Screw
RS Stock No. 198-637
Mfr. Part No.LR04841-100
HK$990.00
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. 198-839
Mfr. Part No.LR09604-100
HK$1,471.39
Each
units
Thermocouple Relay 1 1 90 260 V ac - 96 x 96mm -10°C +50°C 53mm IP50 Panel Mount STATOP -
RS Stock No. 875-1292
BrandRS PRO
HK$883.74
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 Screw
RS Stock No. 914-8482
Mfr. Part No.SRT-N118-1A21-1-4-001
BrandSimex
HK$2,131.16
Each
units
Thermocouple Relay 3 2 230 V ac -210 → +1200 (Type J) °C, -200 → +1000 (Type E) °C, -200 → +1300 (Type N) °C, -200 → +1370 (Type K) °C, -200 → +400 (Type T) °C, -50 → +1768 (Type R) °C, -50 → +1768 (Type S) °C, +250 → +1820 (Type B) °C 110 x 80mm 0°C +50°C 67mm IP67 Wall Mount - Screw
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. 467-131
Mfr. Part No.701061/822-32/000
BrandJumo
HK$2,430.58
Each
units
RTD 4 Relay - 3 12 24 V ac/dc - 76 x 36 mmmm 0°C +55°C - - Panel Mount eTRON M100 -
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 -
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