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. 613-7782
Mfr. Part No.701540/821-02
BrandJumo
TWD3,750.00
Each
units
Thermocouple 1 Relay - 1 230 V ac - 76 x 36 mmmm 0°C +55°C - IP20, IP65 Panel Mount di eco -
RS Stock No. 497-9017
Mfr. Part No.701060/811-05
BrandJumo
TWD4,958.00
Each
units
RTD 1 Relay - 1 115 V ac - - 0°C +55°C - - Panel Mount eTRON -
RS Stock No. 809-0953
Mfr. Part No.PJS5C0HE00
BrandCarel
TWD5,340.00
Each
units
NTC - - - 230 V ac - 59 x 67mm -10°C +50°C 156mm - - Easy XL -
RS Stock No. 124-1060
BrandRS PRO
TWD2,602.00
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. 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. 509-0884
Mfr. Part No.DR 985 PTC
BrandEliwell
TWD10,370.00
Each
units
PTC - - - 230 V ac - 70 x 85mm -5°C +55°C 61mm - - DR 985 -
RS Stock No. 348-1783
Mfr. Part No.40T96-4-00-RR00-000 (EX 40T96-4-00-RR000
BrandGefran
TWD11,199.00
Each
units
- Relay - 2 11 → 27 V ac/dc - 108 x 48mm - - 105mm IP65 - 40T96 -
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. 535-0811
Mfr. Part No.E5C2-R40K AC100-240 0-800
BrandOmron
TWD4,366.00
Each
units
K Type Thermocouple Relay - 1 100 240 V ac - 48 x 48mm -10°C +55°C 86.7mm IP00, IP40, IP66 - E5C2 -
RS Stock No. 117-6659
Mfr. Part No.EMPLUS 600 NTC-PTC 230Vac
BrandEliwell
TWD2,930.00
Each
units
Analogue - 1 - 230 V - 74 x 32mm -5°C +55°C 59mm - Panel Mount EMPLUS 600 Lead Wire
RS Stock No. 762-2133
Mfr. Part No.ID+961-230V+NTC
BrandEliwell
TWD5,617.00
Each
units
NTC, PTC, RTD Digital 1 1 230 V -50 → +99 °C 74 x 32mm -5°C +55°C 60mm IP65 - IDPlus -
RS Stock No. 328-1088
Mfr. Part No.E5C2-R20P-D AC100-240 -50-50
BrandOmron
TWD4,366.00
Each
units
RTD - - - 100 240 V ac -50 +50 °C 48 x 48mm -10°C +55°C 86.7mm - - E5C2 -
RS Stock No. 875-1267
BrandRS PRO
TWD2,538.00
Each
units
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 Stock No. 736-5039
Mfr. Part No.D280-110-0000D-000
BrandP.M.A
TWD10,111.00
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 -
RS Stock No. 809-1054
Mfr. Part No.MINITHERM6-MCU-230V
BrandTempatron
TWD1,304.00
Each
units
NTC - - - 230 V ac - 70 x 45mm -20°C +65°C 22mm - - - -
RS Stock No. 745-7939
Mfr. Part No.PJEZSNP000
BrandCarel
TWD3,180.00
Each
units
NTC - - - 230 V ac -50 → +90 °C 36 x 81mm - - 61mm - - PJ Easy -
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
New
RS Stock No. 198-1175
BrandRS PRO
TWD4,250.00
Each
units
Thermocouple Analogue Relay 1 2 230 V - 96mm x 96mm - - - - - - -
RS Stock No. 906-7721
Mfr. Part No.TSF-4040
TWD3,952.00
Each
units
S Type Thermocouple, Type J, Type K SPDT Relay 1 1 24 V ac/dc - 76.2 x 33.99mm 0°C +65°C 60.33mm IP64 Panel Mount TSF -
RS Stock No. 500-1036
Mfr. Part No.701050/821-02
BrandJumo
TWD4,404.00
Each
units
Thermocouple 1 Relay - 1 230 V ac 0 → 500 °C 90 x 22.5mm 0°C +500°C - - DIN Rail eTRON -