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 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 124-1060
BrandRS PRO
HK$535.73
單位
J Type Thermocouple, K Type Thermocouple, R Type Thermocouple, S Type Thermocouple, T Type Thermocouple Relay 1 1 24 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庫存編號 124-1055
BrandRS PRO
HK$487.52
單位
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庫存編號 124-1050
BrandRS PRO
HK$576.62
單位
NTC Relay 2 3 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 124-1048
BrandRS PRO
HK$409.10
單位
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庫存編號 124-1052
BrandRS PRO
HK$589.30
單位
J Type Thermocouple Relay 1 1 24 V ac -30 → +400 °C 77 x 35mm 0°C +50°C 61mm IP20, IP65 Panel Mount - Screw
RS庫存編號 875-1292
BrandRS PRO
HK$690.70
單位
Digital Current 1 1 100 → 240 V ac - 72 x 72mm 0°C +50°C 95.5mm IP65, NEMA 4X 1/8 DIN RS PRO Screw
RS庫存編號 124-1054
BrandRS PRO
HK$417.88
單位
NTC Relay 1 1 230 V ac -60 → +150 °C 77 x 35mm 0°C +50°C 61mm IP20, IP65 Panel Mount - Screw
RS庫存編號 124-1051
BrandRS PRO
HK$672.09
單位
J Type Thermocouple Relay 1 1 230 V ac -30 → +400 °C 77 x 35mm 0°C +50°C 61mm IP20, IP65 Panel Mount - Screw
RS庫存編號 124-1074
BrandRS PRO
HK$621.85
單位
Current, Voltage None 4 - 24 V ac - 77 x 35mm 0°C +50°C 71mm IP20, IP65 Panel Mount - Screw
RS庫存編號 798-3435
BrandRS PRO
HK$477.27
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
RS庫存編號 124-1046
BrandRS PRO
HK$393.49
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 875-1267
BrandRS PRO
HK$521.92
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 875-1226
BrandRS PRO
HK$1,067.93
單位
Linear, RTD, Thermocouple Relay 1 2 24 V ac/dc - 72 x 72mm 0°C +50°C 87.5mm IP65, NEMA 4X 1/8 DIN RS PRO Screw
RS庫存編號 124-1056
BrandRS PRO
HK$487.52
單位
NTC Relay 1 2 230 V ac -60 → +150 °C 77 x 35mm 0°C +50°C 61mm IP20, IP65 Panel Mount - Screw
RS庫存編號 124-1047
BrandRS PRO
HK$450.01
單位
NTC Relay 1 2 230 V ac -60 → +150 °C 77 x 35mm 0°C +50°C 61mm IP20, IP65 Panel Mount - Screw
RS庫存編號 124-1076
BrandRS PRO
HK$384.83
單位
NTC - 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 124-1075
BrandRS PRO
HK$442.06
單位
NTC - 1 - 230 V ac -60 → +150 °C 77 x 35mm 0°C +50°C 61mm IP20, IP65 Panel Mount - Screw
RS庫存編號 124-1073
BrandRS PRO
HK$589.30
單位
Current, Voltage - 4 - 230 V ac - 77 x 35mm 0°C +50°C 71mm IP20, IP65 Panel Mount - Screw
RS庫存編號 124-1045
BrandRS PRO
HK$417.88
單位
NTC Relay 1 1 230 V ac -60 → +150 °C 77 x 35mm 0°C +50°C 61mm IP20, IP65 Panel Mount - Screw