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庫存編號 500-1165
製造零件編號701060/832-31
BrandJumo
HK$1,261.50
單位
Current 2 Relay - 2 12 → 24 V dc, 24 V ac - 76 x 36mm 0°C +55°C 56mm - Panel Mount eTRON -
RS庫存編號 877-1460
製造零件編號IC+ 915 12V 8A TCJ/K PT100
BrandEliwell
HK$1,357.82
單位
RTD, Thermocouple Digital, Relay 1 2 12 V - 74 x 32mm -5°C +55°C 59mm IP65 Panel Mount ICPlus Screw
RS庫存編號 344-546
製造零件編號TC4810-01-110/240VAC
BrandTempatron
HK$999.66
單位
K Type Thermocouple - - - 110 → 240 V ac 0 → +200 °C 48 x 48mm -10°C +50°C 89mm - 1/16 DIN - -
RS庫存編號 390-7932
製造零件編號40T96-4-00-RR00-001 (EX 40T96-4-00-RR001
BrandGefran
HK$2,835.75
單位
- Relay - - 100 240 V ac - 108 x 48mm - - 105mm IP65 - 40T96 -
RS庫存編號 762-2146
製造零件編號ID+971-230V+NTC
BrandEliwell
HK$1,721.20
單位
NTC, PTC, RTD Digital 2 1 230 V -55 → +140 °C 74 x 32mm -5°C +55°C 60mm IP65 - IDPlus -
RS庫存編號 117-6658
製造零件編號EMPLUS 600 PT100/TCJ-K 230Vac
BrandEliwell
HK$742.30
單位
Analogue - 1 - 230 V ac -150 → +650 (PT100) °C, -40 → +750 (TCJ-K) °C 74 x 32mm -5°C +55°C 59mm - Panel Mount EMPLUS 600 Lead Wire
RS庫存編號 390-7904
製造零件編號40T-48-4-00-RR-0-0-0-1
BrandGefran
HK$2,735.19
單位
Thermocouple PT100 Relay - 2 100 V ac, 240 V ac - 48 x 48mm - - 99mm IP65 - 40T48 -
RS庫存編號 344-619
製造零件編號TC4810-52-110/240VAC
BrandTempatron
HK$999.66
單位
PT100 - - - 110 → 240 V ac 0 → +100 °C 48 x 48mm -10°C +50°C 89mm - 1/16 DIN - -
RS庫存編號 745-7939
製造零件編號PJEZSNP000
BrandCarel
HK$809.04
單位
NTC - - - 230 V ac -50 → +90 °C 36 x 81mm - - 61mm - - PJ Easy -
RS庫存編號 736-5017
製造零件編號D280-112-1000D-000
BrandP.M.A
HK$3,871.87
單位
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庫存編號 198-1169
BrandRS PRO
HK$2,288.00
單位
Thermocouple Analogue Relay 1 2 230 V - 86 mm x 35 mm 0°C +50°C - IP20 DIN Rail - -
RS庫存編號 613-7805
製造零件編號701060/821-02
BrandJumo
HK$2,770.70
單位
Thermocouple 1 Relay - 1 230 V ac - - 0°C +55°C - - Panel Mount eTRON -
RS庫存編號 376-3704
製造零件編號TC4810-05-110/230VAC
BrandTempatron
HK$994.94
單位
K Type Thermocouple Relay - 1 110 → 230 V ac - 48 x 48mm -10°C +50°C 89mm IP40 1/16 DIN - -
RS庫存編號 745-7942
製造零件編號PJEZS0A000
BrandCarel
HK$882.71
單位
NTC - - - 230 V ac -50 → +90 °C 36 x 81mm - - 61mm - - PJ Easy -
RS庫存編號 124-1053
BrandRS PRO
HK$515.83
單位
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庫存編號 497-9017
製造零件編號701060/811-05
BrandJumo
HK$1,261.50
單位
RTD 1 Relay - 1 115 V ac - - 0°C +55°C - - Panel Mount eTRON -
RS庫存編號 736-5020
製造零件編號D280-110-1000D-000
BrandP.M.A
HK$3,389.33
單位
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庫存編號 467-147
製造零件編號701061/820-32/236
BrandJumo
HK$1,840.58
單位
RTD 4 Relay - 4 12 → 24 V ac/dc - 76 x 36 mmmm 0°C +55°C - - Panel Mount eTRON M100 -
RS庫存編號 809-1054
製造零件編號MINITHERM6-MCU-230V
BrandTempatron
HK$331.65
單位
NTC - - - 230 V ac - 70 x 45mm -20°C +65°C 22mm - - - -
全新
RS庫存編號 201-1663
製造零件編號00718287
BrandJumo
HK$1,316.11
單位
PT100, Thermocouple Analogue Relay 5 2 230 V - 90mm x 21.5mmmm - - - - - eTRON T100 -