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. 906-7728
Mfr. Part No.TSS2-2400
MYR393.66
Each
units
NTC, PTC SPDT Relay 1 2 24 V ac/dc - 76.2 x 36.12mm 0°C +70°C 61.91mm IP64 Panel Mount TSS2 -
RS Stock No. 328-1139
Mfr. Part No.E5C2-R20K AC100-240 0-600
BrandOmron
MYR623.05
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. 339-0132
Mfr. Part No.DTC410-02-MH
BrandTempatron
MYR810.34
Each
units
RTD - - - 90 → 260 V ac -99 → +400 °C 48 x 48mm -10°C +50°C 84.5mm - - - -
RS Stock No. 877-1479
Mfr. Part No.IC+ 915 230V 8A TCJ/K PT100
BrandEliwell
MYR645.91
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
MYR389.19
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. 481-7824
Mfr. Part No.PA201.004AX01
BrandBaumer
MYR512.39
Each
units
- - - - 100 → 300 V dc, 85 → 265 V ac - - - - - - - PA201 -
RS Stock No. 198-615
Mfr. Part No.LR04841-101
MYR482.94
Each
units
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 Stock No. 746-3170
Mfr. Part No.E5LC6
BrandOmron
MYR471.41
Each
units
- - - - - - - - - - - - E5L -
RS Stock No. 913-9983
Mfr. Part No.PJEZC0M000
BrandCarel
MYR667.28
Each
units
Digital 3 Relay 1 3 230 V ac - 81 x 36mm - - - IP65 Panel Mount - Screw
RS Stock No. 198-845
Mfr. Part No.LR09601-100
MYR507.46
Each
units
J Type Thermocouple Relay 1 1 115 V ac, 230 V ac - 96 x 96mm -10°C +50°C 53mm IP50 Panel Mount STATOP -
RS Stock No. 668-3036
Mfr. Part No.701530/888-22
BrandJumo
MYR984.81
Each
units
Current, RTD, Thermocouple, Voltage 1 Logic, 1 Relay - 2 20 → 53 V ac/dc -200 → +850 °C 48 x 24mm 0°C +55°C 100mm - Panel Mount di 32 -
RS Stock No. 809-0979
Mfr. Part No.IREVS0EN00
BrandCarel
MYR572.16
Each
units
NTC - - - 230 V ac - 76.2 x 34.7mm - - 79.5mm - - IR33+ -
RS Stock No. 745-7945
Mfr. Part No.PJEZS6P000
BrandCarel
MYR455.58
Each
units
PTC - - - 230 V ac -50 → +90 °C 36 x 81mm - - 61mm - - PJ Easy -
RS Stock No. 198-637
Mfr. Part No.LR04841-100
MYR518.52
Each
units
J 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 Stock No. 746-3111
Mfr. Part No.E5C2-R20J AC100-240 0-200
BrandOmron
MYR610.06
Each
units
J Type Thermocouple - - - 100 → 240 V ac 0 → +200 °C 48 x 48mm - - 86.7mm - - E5C2 -
RS Stock No. 344-546
Mfr. Part No.TC4810-01-110/240VAC
BrandTempatron
MYR531.08
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. 736-5020
Mfr. Part No.D280-110-1000D-000
BrandP.M.A
MYR1,656.48
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 - - - 90 → 250 V ac 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, -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, -2.5 → 115 mV, -200 → +200 (Pt1000 Type Resistance Transducer) °C, -200 → +400 (T Type Thermocouple) °C, -200 → +850 (Pt100 Type Resistance Transducer) °C, -25 → 1150 mV, -25 → 90 mV, -5 → 5 V, -500 → 500 mV 48 x 96mm 0°C +60°C 118mm - - D280-1 -
RS Stock No. 376-3704
Mfr. Part No.TC4810-05-110/230VAC
BrandTempatron
MYR586.64
Each
units
K Type Thermocouple Relay - 1 110 → 230 V ac - 48 x 48mm -10°C +50°C 89mm IP40 1/16 DIN - -
RS Stock No. 437-0909
Mfr. Part No.40T96-4-00-RR00-301 (EX 40T96-4-00-RR031
BrandGefran
MYR1,705.60
Each
units
- Relay - 1 100 → 240 V ac/dc Gefran 40 96 x 48mm - - 92mm IP65 - 40T96 -
RS Stock No. 736-5004
Mfr. Part No.D280-113-0000D-000
BrandP.M.A
MYR1,663.38
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 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, -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, -2.5 → 115 mV, -200 → +200 (Pt1000 Type Resistance Transducer) °C, -200 → +400 (T Type Thermocouple) °C, -200 → +850 (Pt100 Type Resistance Transducer) °C, -25 → 1150 mV, -25 → 90 mV, -5 → 5 V, -500 → 500 mV 48 x 96mm 0°C +60°C 118mm - - D280-1 -
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