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 497-8979
製造零件編號701050/811-31
BrandJumo
HK$1,120.43
單位
RTD 1 Relay - 1 12 → 24 V dc -200 °C → 600 °C 93.5 x 22.5mm 0°C +55°C 61.6mm IP20 DIN Rail eTRON -
RS庫存編號 877-1463
製造零件編號IC+ 902 230V 8A + NTC
BrandEliwell
HK$659.49
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 613-7798
製造零件編號701540/831-02
BrandJumo
HK$908.52
單位
Current 1 Relay - 1 230 V ac - 76 x 36 mmmm 0°C +55°C - IP20, IP65 Panel Mount di eco -
RS庫存編號 500-1143
製造零件編號701050/821-31
BrandJumo
HK$1,137.71
單位
Thermocouple 1 Relay - 1 12-24 V dc, 24 V ac 0 → 500 °C 90 x 22.5mm 0°C +500°C 61.6mm IP20 DIN Rail eTRON -
RS庫存編號 328-1167
製造零件編號E5C2-R40K AC100-240 0-200
BrandOmron
HK$1,110.82
單位
K Type Thermocouple Relay - 1 100 → 240 V ac - 48 x 48mm -10°C +55°C 86.7mm IP00, IP40, IP66 - E5C2 -
RS庫存編號 809-1004
製造零件編號DN33A9MR20
BrandCarel
HK$1,965.16
單位
NTC, PT100, PTC - - 4 24 V ac, 30 V dc Carel DN33 110 x 70mm -10°C +60°C 60mm - - DN33 -
RS庫存編號 328-1139
製造零件編號E5C2-R20K AC100-240 0-600
BrandOmron
HK$1,110.82
單位
K Type Thermocouple - - - 100 → 240 V ac 0 → 600 °C 48 x 48mm -10°C +55°C 86.7mm - - E5C2 -
RS庫存編號 913-9970
製造零件編號PB00F0EP30
BrandCarel
HK$1,107.16
單位
- 3 Relay 1 3 230 V ac - - - - - - Panel Mount - Faston, Screw
RS庫存編號 875-1267
BrandRS PRO
HK$645.67
單位
RTD, Thermocouple Relay 1 1 230 V ac -50 → +100 °C 35 x 77mm 0°C +50°C 62.5mm IP65, NEMA 4X 1/16 DIN RS PRO Screw
RS庫存編號 198-328
製造零件編號LR09604-110
HK$1,517.82
單位
PT100 Relay 1 1 90 → 260 V ac - 96 x 96mm -10°C +50°C 53mm IP50 Panel Mount STATOP -
RS庫存編號 198-615
製造零件編號LR04841-101
HK$959.10
單位
K 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庫存編號 497-8985
製造零件編號701050/811-05
BrandJumo
HK$1,120.43
單位
RTD 1 Relay - 1 115 V ac - 93.5 x 22.5mm 0°C +55°C 61.6mm IP20 DIN Rail eTRON -
RS庫存編號 344-625
製造零件編號TC4830-52-110/230VAC
BrandTempatron
HK$1,063.45
單位
- Relay - 1 110 → 230 V ac - 48 x 48mm - - 91mm IP40 1/16 DIN - -
RS庫存編號 124-1058
BrandRS PRO
HK$661.94
單位
PT100 Relay 1 2 230 V ac -200 → +600 (PT100) °C, -99.9 → +300 (PT100) °C 77 x 35mm 0°C +50°C 73mm IP20, IP65 Panel Mount - Screw
RS庫存編號 198-1171
BrandRS PRO
HK$789.36
單位
RTD Analogue Relay 1 2 230 V ac - 72mm x 72mm 0°C +50°C - IP20, IP65 - - -
RS庫存編號 344-552
製造零件編號TC4810-02-110/240VAC
BrandTempatron
HK$980.69
單位
K Type Thermocouple - - - 110 → 240 V ac 0 → +400 °C 48 x 48mm -10°C +50°C 89mm - 1/16 DIN - -
RS庫存編號 535-0748
製造零件編號E5C2-R20K AC100-240 0-1200
BrandOmron
HK$1,110.82
單位
- - - - - - - - - - - - - -
全新
RS庫存編號 201-1666
製造零件編號00721352
BrandJumo
HK$1,164.25
單位
PT100, Thermocouple Analogue Relay 5 2 12 → 24 Vdc, 24 Vac - 90mm x 21.5mm - - - - - eTRON T100 -
RS庫存編號 335-4653
製造零件編號4T-96-4-00-0
BrandGefran
HK$2,273.63
單位
- - - - 11 → 27 V ac/dc - 96 x 48mm - - 105mm IP65 - 4T -
RS庫存編號 798-3435
BrandRS PRO
HK$706.99
單位
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