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. 198-615
Mfr. Part No.LR04841-101
TWD3,873.00
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. 500-1036
Mfr. Part No.701050/821-02
BrandJumo
TWD4,404.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 497-9001
Mfr. Part No.701060/811-31
BrandJumo
TWD4,958.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 124-1056
BrandRS PRO
TWD2,402.00
Each
units
NTC Relay 1 2 230 V ac -60 → +150 °C 77 x 35mm 0°C +50°C 61mm IP20, IP65 Panel Mount - Screw
New
RS Stock No. 198-1170
BrandRS PRO
TWD2,962.00
Each
units
Thermocouple Analogue Relay 1 2 230 V - 72mm x 72mm - - - - - - -
RS Stock No. 809-0957
Mfr. Part No.PJS5C0HF00
BrandCarel
TWD4,188.00
Each
units
NTC - - - 115 V ac - 59 x 67mm -10°C +50°C 156mm - - Easy XL -
RS Stock No. 877-1466
Mfr. Part No.IC+ 902 230V 15A + NTC
BrandEliwell
TWD3,125.00
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. 913-9986
Mfr. Part No.PJEZY00000
BrandCarel
TWD3,285.00
Each
units
Digital 2 Relay 1 2 230 V ac - 81 x 36mm - - - IP65 Panel Mount - Screw
RS Stock No. 124-1075
BrandRS PRO
TWD1,976.00
Each
units
NTC - 1 - 230 V ac -60 → +150 °C 77 x 35mm 0°C +50°C 61mm IP20, IP65 Panel Mount - Screw
RS Stock No. 500-1137
Mfr. Part No.701050/831-31
BrandJumo
TWD4,404.00
Each
units
Voltage 1 Relay - 1 24 V ac, 230 V ac -50 → +180 °C 90 x 22.5mm 0°C +55°C - - DIN Rail eTRON -
New
RS Stock No. 198-1176
BrandRS PRO
TWD4,250.00
Each
units
Thermocouple Analogue Relay 1 2 230 V - 96mm x 96mm - - - - - - -
RS Stock No. 841-7989
Mfr. Part No.6.533.012.300
BrandKubler
TWD6,471.00
Each
units
Current, Voltage - - - 10 30 V dc - 48 x 24mm -20°C +65°C 59mm - - CODIX 533 -
RS Stock No. 809-1004
Mfr. Part No.DN33A9MR20
BrandCarel
TWD7,724.00
Each
units
NTC, PT100, PTC - - 4 24 V ac, 30 V dc Carel DN33 110 x 70mm -10°C +60°C 60mm - - DN33 -
New
RS Stock No. 198-1172
BrandRS PRO
TWD4,078.00
Each
units
Thermocouple Analogue Relay - 2 - - 48 mm x 48 mm - - - - - - -
RS Stock No. 497-8985
Mfr. Part No.701050/811-05
BrandJumo
TWD4,771.00
Each
units
RTD 1 Relay - 1 115 V ac - 93.5 x 22.5mm 0°C +55°C 61.6mm IP20 DIN Rail eTRON -
RS Stock No. 348-144
Mfr. Part No.FTST400K-110/240VAC
BrandTempatron
TWD3,911.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 481-7830
Mfr. Part No.PA201.005AX01
BrandBaumer
TWD4,321.00
Each
units
- - - - 10 → 70 V dc, 21 → 53 V ac - - - - - - - PA201 -
RS Stock No. 481-7824
Mfr. Part No.PA201.004AX01
BrandBaumer
TWD4,321.00
Each
units
- - - - 85 → 265 V ac, 100 → 300 V dc - - - - - - - PA201 -
RS Stock No. 809-0979
Mfr. Part No.IREVS0EN00
BrandCarel
TWD3,861.00
Each
units
NTC - - - 230 V ac - 76.2 x 34.7mm - - 79.5mm - - IR33+ -
RS Stock No. 736-5014
Mfr. Part No.D280-112-0000D-000
BrandP.M.A
TWD12,184.00
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 -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 -