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. 124-1053
BrandRS PRO
HK$513.39
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 - Screw
RS Stock No. 124-1059
BrandRS PRO
HK$658.80
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 - Screw
RS Stock No. 124-1076
BrandRS PRO
HK$500.43
Each
units
NTC - 1 - 24 V ac/dc -60 → +150 °C 77 x 35mm 0°C +50°C 61mm IP20, IP65 Panel Mount - Screw
RS Stock No. 913-9977
Mfr. Part No.PB00Y0EV30
BrandCarel
HK$1,022.05
Each
units
- 3 Relay 1 3 230 V ac - - - - - - Panel Mount - Screw
RS Stock No. 124-1073
BrandRS PRO
HK$704.05
Each
units
Current, Voltage - 4 - 230 V ac - 77 x 35mm 0°C +50°C 71mm IP20, IP65 Panel Mount - Screw
RS Stock No. 736-5020
Mfr. Part No.D280-110-1000D-000
BrandP.M.A
HK$3,389.33
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. 328-1139
Mfr. Part No.E5C2-R20K AC100-240 0-600
BrandOmron
HK$1,110.82
Each
units
K Type Thermocouple - - - 100 240 V ac 0 600 °C 48 x 48mm -10°C +55°C 86.7mm - - E5C2 -
RS Stock No. 500-1109
Mfr. Part No.701060/832-02
BrandJumo
HK$1,294.66
Each
units
Current 2 Relay - 2 230 V ac - - 0°C +55°C - - Panel Mount eTRON -
RS Stock No. 798-3435
BrandRS PRO
HK$706.99
Each
units
NTC Relay 1 3 10 30 V dc -58 +212 °F, -50 +100 °C 76 x 34.5mm 0°C +50°C 65mm NEMA 4X DIN Rail RS PRO Screw
RS Stock No. 745-7933
Mfr. Part No.PJEZS0P000
BrandCarel
HK$791.53
Each
units
NTC - - - 230 V ac -50 → +90 °C 36 x 81mm - - 61mm - - PJ Easy -
RS Stock No. 762-2133
Mfr. Part No.ID+961-230V+NTC
BrandEliwell
HK$1,428.97
Each
units
NTC, PTC, RTD Digital 1 1 230 V -50 → +99 °C 74 x 32mm -5°C +55°C 60mm IP65 - IDPlus -
RS Stock No. 875-1239
BrandRS PRO
HK$493.47
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. 791-5984
Mfr. Part No.6.564.010.300
BrandKubler
HK$2,042.84
Each
units
RTD, Thermocouple - - - 10 30 V dc - 96 x 48mm -20°C +65°C 90.5mm - - CODIX 564 -
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. 467-147
Mfr. Part No.701061/820-32/236
BrandJumo
HK$1,954.18
Each
units
RTD 4 Relay - 4 12 24 V ac/dc - 76 x 36 mmmm 0°C +55°C - - Panel Mount eTRON M100 -
RS Stock No. 875-1264
BrandRS PRO
HK$618.33
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. 809-1026
Mfr. Part No.TC4810-54-110/230VAC
BrandTempatron
HK$1,101.93
Each
units
PT100 - - - 110 → 230 V ac - 48 x 48mm -10°C +50°C 89mm - 1/16 DIN - -
RS Stock No. 745-7945
Mfr. Part No.PJEZS6P000
BrandCarel
HK$850.11
Each
units
PTC - - - 230 V ac -50 → +90 °C 36 x 81mm - - 61mm - - PJ Easy -
RS Stock No. 535-0710
Mfr. Part No.E5C2-R20K AC100-240 0-400
BrandOmron
HK$1,081.08
Each
units
K Type Thermocouple - - - 100 → 240 V ac 0 → 400 °C 48 x 48mm -10°C +55°C 86.7mm - - E5C2 -
RS Stock No. 511-7440
Mfr. Part No.IR33S0LR00
BrandCarel
HK$903.38
Each
units
NTC - - - 12 → 24 V ac/dc -50 → +90 °C 76.2 x 34.2mm -10°C +50°C 94mm - - IR33 -
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