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 479-6698
製造零件編號ID 985 LX-12V-8A-PTC
BrandEliwell
HK$2,039.92
單位
PTC Relay - 4 12 V ac/dc -50 → +140 °C 74 x 32mm -5°C +55°C 60mm IP65 Panel Mount ID 985LX Screw
RS庫存編號 786-4766
BrandRS PRO
HK$577.50
單位
J Type Thermocouple Relay 1 1 230 V ac 0 → +800 °C 77 x 35mm 0°C +50°C 58.5mm NEMA 4X DIN Rail RS PRO Screw
RS庫存編號 877-1454
製造零件編號IC+ 902 12V 8A + NTC
BrandEliwell
HK$635.00
單位
NTC, PTC Relay 1 1 12 V - 74 x 32mm -50°C +110°C 59mm IP65 Panel Mount ICPlus Screw
RS庫存編號 809-1007
製造零件編號IR33S0ER00
BrandCarel
HK$1,269.44
單位
NTC - - - 115 → 230 V ac - 76.2 x 101mm -10°C +60°C 80mm - - IR33 -
RS庫存編號 497-8991
製造零件編號701050/811-02
BrandJumo
HK$1,115.79
單位
RTD 1 Relay - 1 230 V ac - 93.5 x 22.5mm 0°C +55°C 61.6mm IP20 DIN Rail eTRON -
RS庫存編號 875-1214
BrandRS PRO
HK$1,098.37
單位
Linear, RTD, Thermocouple Relay 1 2 100 → 240 V ac - 48 x 96mm 0°C +50°C 86.6mm IP65, NEMA 4X 1/8 DIN (H) RS PRO Screw
RS庫存編號 894-6985
製造零件編號RE55 0411008
BrandLumel
HK$1,327.00
單位
PT100/1 Relay, Transistor 1 1 85 → 253 V ac/dc 0 → +250 °C 96 x 96mm 0°C +50°C 65mm IP20, IP40 Panel Mount RE55 Plug-In, Screw
RS庫存編號 442-0694
製造零件編號6.531.012.300
BrandKubler
HK$1,204.21
單位
Ni100, PT100 - - - 10 → 30 V dc - 48 x 24 (1/32 DIN)mm -20°C +65°C 59mm IP65 - CODIX 531 -
RS庫存編號 497-9001
製造零件編號701060/811-31
BrandJumo
HK$1,041.05
單位
RTD 1 Relay - 1 12 → 24 V dc, 24 V ac - 76 x 36mm 0°C +55°C 56mm - Panel Mount eTRON -
RS庫存編號 894-6982
製造零件編號RE55 0412008
BrandLumel
HK$1,194.30
單位
PT100/1 Relay, Transistor 1 1 85 → 253 V ac/dc 0 → +250 °C 96 x 96mm 0°C +50°C 65mm IP20, IP40 Panel Mount RE55 Plug-In, Screw
RS庫存編號 762-2137
製造零件編號ID+971-12V+NTC
BrandEliwell
HK$1,125.16
單位
NTC, PTC, RTD Digital 2 1 12 V -55 → +140 °C 74 x 32mm -5°C +55°C 60mm IP65 - IDPlus -
RS庫存編號 348-144
製造零件編號FTST400K-110/240VAC
BrandTempatron
HK$947.20
單位
Thermocouple - - - 110 → 240 V ac 0 → +400 °C 48 x 48mm -10°C +50°C 112mm - - - -
RS庫存編號 344-546
製造零件編號TC4810-01-110/240VAC
BrandTempatron
HK$825.55
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 762-2146
製造零件編號ID+971-230V+NTC
BrandEliwell
HK$1,715.90
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 339-0104
製造零件編號DTC410-02-ML
BrandTempatron
HK$1,298.00
單位
RTD - - - 10 → 32 V ac/dc -99 → +400 °C 48 x 48mm -10°C +50°C 84.5mm - - - -
RS庫存編號 117-6659
製造零件編號EMPLUS 600 NTC-PTC 230Vac
BrandEliwell
HK$716.10
單位
Analogue - 1 - 230 V - 74 x 32mm -5°C +55°C 59mm - Panel Mount EMPLUS 600 Lead Wire
RS庫存編號 328-1088
製造零件編號E5C2-R20P-D AC100-240 -50-50
BrandOmron
HK$1,155.08
單位
RTD - - - 100 → 240 V ac -50 → +50 °C 48 x 48mm -10°C +55°C 86.7mm - - E5C2 -
RS庫存編號 877-1466
製造零件編號IC+ 902 230V 15A + NTC
BrandEliwell
HK$762.09
單位
NTC, PTC Relay 1 1 230 V - 74 x 32mm -5°C +55°C 59mm IP65 Panel Mount ICPlus Screw
RS庫存編號 500-1165
製造零件編號701060/832-31
BrandJumo
HK$1,041.05
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 613-7782
製造零件編號701540/821-02
BrandJumo
HK$947.89
單位
Thermocouple 1 Relay - 1 230 V ac - 76 x 36 mmmm 0°C +55°C - IP20, IP65 Panel Mount di eco -