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. 500-1109
Mfr. Part No.701060/832-02
BrandJumo
kr 1 285,43
Each
Units
Current 2 Relay - 2 230 V ac - - 0°C +55°C - - Panel Mount eTRON -
RS Stock No. 124-1058
BrandRS PRO
kr 746,37
Each
Units
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 Stock No. 124-1060
BrandRS PRO
kr 746,37
Each
Units
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 Stock No. 877-1460
Mfr. Part No.IC+ 915 12V 8A TCJ/K PT100
BrandEliwell
kr 1 292,96
Each
Units
RTD, Thermocouple Digital, Relay 1 2 12 V - 74 x 32mm -5°C +55°C 59mm IP65 Panel Mount ICPlus Screw
RS Stock No. 745-7933
Mfr. Part No.PJEZS0P000
BrandCarel
kr 952,47
Each
Units
NTC - - - 230 V ac -50 → +90 °C 36 x 81mm - - 61mm - - PJ Easy -
RS Stock No. 745-7936
Mfr. Part No.PJEZMNN0E0
BrandCarel
kr 743,42
Each
Units
NTC - - - 230 V ac -50 → +90 °C 36 x 81mm - - 34mm - - PJ Easy -
RS Stock No. 745-7945
Mfr. Part No.PJEZS6P000
BrandCarel
kr 952,47
Each
Units
PTC - - - 230 V ac -50 → +90 °C 36 x 81mm - - 61mm - - PJ Easy -
RS Stock No. 117-6659
Mfr. Part No.EMPLUS 600 NTC-PTC 230Vac
BrandEliwell
kr 926,75
Each
Units
Analogue - 1 - 230 V - 74 x 32mm -5°C +55°C 59mm - Panel Mount EMPLUS 600 Lead Wire
RS Stock No. 877-1454
Mfr. Part No.IC+ 902 12V 8A + NTC
BrandEliwell
kr 725,37
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. 479-6698
Mfr. Part No.ID 985 LX-12V-8A-PTC
BrandEliwell
kr 2 047,74
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. 877-1479
Mfr. Part No.IC+ 915 230V 8A TCJ/K PT100
BrandEliwell
kr 1 350,44
Each
Units
RTD, Thermocouple Digital, Relay 1 2 230 V - 74 x 32mm -5°C +55°C 59mm IP65 Panel Mount ICPlus Screw
RS Stock No. 117-6658
Mfr. Part No.EMPLUS 600 PT100/TCJ-K 230Vac
BrandEliwell
kr 874,88
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. 497-8963
Mfr. Part No.701060/811-02
BrandJumo
kr 1 285,43
Each
Units
RTD 1 Relay - 1 230 V ac - 76 x 36mm 0°C +55°C 56mm - Panel Mount eTRON -
RS Stock No. 762-2146
Mfr. Part No.ID+971-230V+NTC
BrandEliwell
kr 2 225,76
Each
Units
NTC, PTC, RTD Digital 2 1 230 V -55 → +140 °C 74 x 32mm -5°C +55°C 60mm IP65 - IDPlus -
RS Stock No. 736-5026
Mfr. Part No.D280-111-0000D-000
BrandP.M.A
kr 3 026,93
Each
Units
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 - - - 18 → 30 V dc, 24 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 Stock No. 497-8991
Mfr. Part No.701050/811-02
BrandJumo
kr 1 159,31
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. 328-1139
Mfr. Part No.E5C2-R20K AC100-240 0-600
BrandOmron
kr 1 415,00
Each
Units
K Type Thermocouple - - - 100 240 V ac 0 600 °C 48 x 48mm -10°C +55°C 86.7mm - - E5C2 -
RS Stock No. 875-1264
BrandRS PRO
kr 644,26
Each
Units
Thermocouple SSR 1 1 230 V ac 0 → +800 °C 35 x 77mm 0°C +50°C 62.5mm IP65, NEMA 4X 1/16 DIN RS PRO Screw
RS Stock No. 913-9986
Mfr. Part No.PJEZY00000
BrandCarel
kr 982,39
Each
Units
Digital 2 Relay 1 2 230 V ac - 81 x 36mm - - - IP65 Panel Mount - Screw
RS Stock No. 497-9017
Mfr. Part No.701060/811-05
BrandJumo
kr 1 285,43
Each
Units
RTD 1 Relay - 1 115 V ac - - 0°C +55°C - - Panel Mount eTRON -
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