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. 479-6698
Mfr. Part No.ID 985 LX-12V-8A-PTC
BrandEliwell
HK$2,074.53
Each
units
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 Stock No. 877-1454
Mfr. Part No.IC+ 902 12V 8A + NTC
BrandEliwell
HK$669.93
Each
units
NTC, PTC Relay 1 1 12 V - 74 x 32mm -50°C +110°C 59mm IP65 Panel Mount ICPlus Screw
RS Stock No. 894-6985
Mfr. Part No.RE55 0411008
BrandLumel
HK$1,327.00
Each
units
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 Stock No. 809-1007
Mfr. Part No.IR33S0ER00
BrandCarel
HK$1,270.07
Each
units
NTC - - - 115 → 230 V ac - 76.2 x 101mm -10°C +60°C 80mm - - IR33 -
RS Stock No. 875-1214
BrandRS PRO
HK$1,869.52
Each
units
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 Stock No. 497-8991
Mfr. Part No.701050/811-02
BrandJumo
HK$1,120.43
Each
units
RTD 1 Relay - 1 230 V ac - 93.5 x 22.5mm 0°C +55°C 61.6mm IP20 DIN Rail eTRON -
RS Stock No. 442-0694
Mfr. Part No.6.531.012.300
BrandKubler
HK$1,244.48
Each
units
Ni100, PT100 - - - 10 → 30 V dc - 48 x 24 (1/32 DIN)mm -20°C +65°C 59mm IP65 - CODIX 531 -
RS Stock No. 894-6982
Mfr. Part No.RE55 0412008
BrandLumel
HK$1,281.62
Each
units
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 Stock No. 497-9001
Mfr. Part No.701060/811-31
BrandJumo
HK$1,294.66
Each
units
RTD 1 Relay - 1 12 → 24 V dc, 24 V ac - 76 x 36mm 0°C +55°C 56mm - Panel Mount eTRON -
RS Stock No. 762-2137
Mfr. Part No.ID+971-12V+NTC
BrandEliwell
HK$1,467.52
Each
units
NTC, PTC, RTD Digital 2 1 12 V -55 → +140 °C 74 x 32mm -5°C +55°C 60mm IP65 - IDPlus -
RS Stock No. 117-6658
Mfr. Part No.EMPLUS 600 PT100/TCJ-K 230Vac
BrandEliwell
HK$738.80
Each
units
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 Stock No. 783-4724
Mfr. Part No.PZD0C0P001
BrandCarel
HK$1,169.17
Each
units
NTC - - - 115 V ac, 230 V ac - 81 x 36mm -10°C +50°C 58mm - - PZD -
RS Stock No. 117-6659
Mfr. Part No.EMPLUS 600 NTC-PTC 230Vac
BrandEliwell
HK$745.43
Each
units
Analogue - 1 - 230 V - 74 x 32mm -5°C +55°C 59mm - Panel Mount EMPLUS 600 Lead Wire
RS Stock No. 437-0915
Mfr. Part No.40T96-4-24-RRR0-301 (EX 40T96-4-24-RRR31
BrandGefran
HK$3,645.81
Each
units
- Relay - 3 100 → 240 V ac/dc Gefran 40 108 x 48mm - - 105mm IP65 - 40T96 -
RS Stock No. 344-546
Mfr. Part No.TC4810-01-110/240VAC
BrandTempatron
HK$994.94
Each
units
K Type Thermocouple - - - 110 → 240 V ac 0 → +200 °C 48 x 48mm -10°C +50°C 89mm - 1/16 DIN - -
RS Stock No. 500-1165
Mfr. Part No.701060/832-31
BrandJumo
HK$1,294.66
Each
units
Current 2 Relay - 2 12 → 24 V dc, 24 V ac - 76 x 36mm 0°C +55°C 56mm - Panel Mount eTRON -
RS Stock No. 500-1092
Mfr. Part No.701060/822-31
BrandJumo
HK$1,294.66
Each
units
J L K Thermocouple 2 Relay - 2 12 → 24 V dc, 24 V ac - - 0°C +55°C - - Panel Mount eTRON -
RS Stock No. 348-144
Mfr. Part No.FTST400K-110/240VAC
BrandTempatron
HK$994.94
Each
units
Thermocouple - - - 110 → 240 V ac 0 → +400 °C 48 x 48mm -10°C +50°C 112mm - - - -
RS Stock No. 877-1466
Mfr. Part No.IC+ 902 230V 15A + NTC
BrandEliwell
HK$795.19
Each
units
NTC, PTC Relay 1 1 230 V - 74 x 32mm -5°C +55°C 59mm IP65 Panel Mount ICPlus Screw
RS Stock No. 339-0104
Mfr. Part No.DTC410-02-ML
BrandTempatron
HK$1,424.97
Each
units
RTD - - - 10 → 32 V ac/dc -99 → +400 °C 48 x 48mm -10°C +50°C 84.5mm - - - -