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. 809-1017
Mfr. Part No.TC4810-53-110/230VAC
BrandTempatron
HK$12,553.91
Each
units
PT100 - - - 110 → 230 V ac - 48 x 48mm -10°C +50°C 89mm - 1/16 DIN - -
RS Stock No. 420-035
Mfr. Part No.DR4020 TCJ-K-R-S-T
BrandEliwell
HK$3,558.18
Each
units
Thermocouple - - - 90 240 V ac -40 +1600 °C 70 x 85mm -5°C +55°C 61mm - - DR 4000 -
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. 736-5039
Mfr. Part No.D280-110-0000D-000
BrandP.M.A
HK$2,560.27
Each
units
B Type Thermocouple, C Type Thermocouple, Current, D Type Thermocouple, E Type Thermocouple, J Type Thermocouple, K Type Thermocouple, L Type Thermocouple, N Type Thermocouple, PT1000 Type Resistance Transducer, R Type Thermocouple, S Type Thermocouple, T Type Thermocouple, Voltage - - - 90 → 250 V ac -500 → 500 mV, -200 → +200 (Pt1000 Type Resistance Transducer) °C, -200 → +400 (T Type Thermocouple) °C, -200 → +850 (Pt100 Type Resistance Transducer) °C, -100 → +1000 (E Type Thermocouple) °C, -100 → +1200 (J Type Thermocouple) °C, -100 → +1300 (N Type Thermocouple) °C, -100 → +1350 (K Type Thermocouple) °C, -100 → +900 (L Type Thermocouple) °C, -25 → 1150 mV, -25 → 90 mV, -5 → 5 V, -2.5 → 115 mV, 0 → +1760 (R Type Thermocouple) °C, 0 → +1760 (S Type Thermocouple) °C, 0 → +1820 (B Type Thermocouple) °C, 0 → +2315 (C Type Thermocouple) °C, 0 → +2315 (D Type Thermocouple) °C, 0 → 10 V, 0 → 20 mA 48 x 96mm 0°C +60°C 118mm - - D280-1 -
RS Stock No. 746-3111
Mfr. Part No.E5C2-R20J AC100-240 0-200
BrandOmron
HK$1,110.82
Each
units
J Type Thermocouple - - - 100 240 V ac 0 +200 °C 48 x 48mm - - 86.7mm - - E5C2 -
RS Stock No. 328-1101
Mfr. Part No.E5C2-R20K AC100-240 0-200
BrandOmron
HK$1,110.82
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. 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. 791-5980
Mfr. Part No.6.564.010.000
BrandKubler
HK$1,938.28
Each
units
RTD, Thermocouple - - - 90 260 V ac - 96 x 48mm -20°C +65°C 90.5mm - - CODIX 564 -
RS Stock No. 736-5026
Mfr. Part No.D280-111-0000D-000
BrandP.M.A
HK$2,704.53
Each
units
B Type Thermocouple, C Type Thermocouple, Current, D Type Thermocouple, E Type Thermocouple, J Type Thermocouple, K Type Thermocouple, L Type Thermocouple, N Type Thermocouple, PT1000 Type Resistance Transducer, R Type Thermocouple, S Type Thermocouple, T Type Thermocouple, Voltage - - - 18 → 30 V dc, 24 V ac -500 → 500 mV, -200 → +200 (Pt1000 Type Resistance Transducer) °C, -200 → +400 (T Type Thermocouple) °C, -200 → +850 (Pt100 Type Resistance Transducer) °C, -100 → +1000 (E Type Thermocouple) °C, -100 → +1200 (J Type Thermocouple) °C, -100 → +1300 (N Type Thermocouple) °C, -100 → +1350 (K Type Thermocouple) °C, -100 → +900 (L Type Thermocouple) °C, -25 → 1150 mV, -25 → 90 mV, -5 → 5 V, -2.5 → 115 mV, 0 → +1760 (R Type Thermocouple) °C, 0 → +1760 (S Type Thermocouple) °C, 0 → +1820 (B Type Thermocouple) °C, 0 → +2315 (C Type Thermocouple) °C, 0 → +2315 (D Type Thermocouple) °C, 0 → 10 V, 0 → 20 mA 48 x 96mm 0°C +60°C 118mm - - D280-1 -
RS Stock No. 809-1029
Mfr. Part No.TC4810-01-24VAC/DC
BrandTempatron
HK$1,178.43
Each
units
Thermocouple - - - 24 V ac/dc - 48 x 48mm -10°C +50°C 89mm - 1/16 DIN - -
RS Stock No. 335-4653
Mfr. Part No.4T-96-4-00-0
BrandGefran
HK$2,285.60
Each
units
- - - - 11 27 V ac/dc - 96 x 48mm - - 105mm IP65 - 4T -
RS Stock No. 198-851
Mfr. Part No.LR09604-106
HK$1,596.79
Each
units
K Type Thermocouple Relay 1 1 90 260 V ac - 96 x 96mm -10°C +50°C 53mm IP50 Panel Mount STATOP -
RS Stock No. 344-552
Mfr. Part No.TC4810-02-110/240VAC
BrandTempatron
HK$980.69
Each
units
K Type Thermocouple - - - 110 240 V ac 0 +400 °C 48 x 48mm -10°C +50°C 89mm - 1/16 DIN - -
RS Stock No. 124-1055
BrandRS PRO
HK$611.25
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. 914-8473
Mfr. Part No.SRT-N118-1321-1-4-001
BrandSimex
HK$1,471.64
Each
units
Thermoresistance 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. 809-1035
Mfr. Part No.TC4830-53-110/230VAC
BrandTempatron
HK$421.00
Each
units
PT100 - - - 110 → 230 V ac - 48 x 48mm -10°C +50°C 89mm - 1/16 DIN - -
RS Stock No. 875-1239
BrandRS PRO
HK$751.28
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 Screw
RS Stock No. 420-047
Mfr. Part No.DR4010 PTC+PTC
BrandEliwell
HK$2,370.35
Each
units
PTC - - - 90 240 V ac -55 +150 °C 70 x 85mm -5°C +55°C 61mm - - DR 4000 -
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