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. 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. 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. 511-7440
Mfr. Part No.IR33S0LR00
BrandCarel
HK$862.43
Each
units
NTC - - - 12 → 24 V ac/dc -50 → +90 °C 76.2 x 34.2mm -10°C +50°C 94mm - - IR33 -
RS Stock No. 809-0994
Mfr. Part No.PJEZC0P000
BrandCarel
HK$1,027.31
Each
units
NTC - - - 230 V ac - 81 x 36mm -10°C +50°C 58mm - - PJ Easy -
RS Stock No. 511-7478
Mfr. Part No.IR33C0LR00
BrandCarel
HK$1,172.83
Each
units
NTC - - - 12 → 24 V ac -50 → +90 °C 76.2 x 34.2mm -10°C +50°C 94mm - - IR33 -
RS Stock No. 913-9974
Mfr. Part No.PB00H0HB00
BrandCarel
HK$1,618.42
Each
units
Digital 5 Relay 1 5 230 V ac - 167 x 36mm -10°C +65°C - IP65 Panel Mount PB00 Screw
RS Stock No. 809-0997
Mfr. Part No.PJEZS0G000
BrandCarel
HK$1,040.47
Each
units
NTC - - - 230 V ac - 81 x 36mm -10°C +50°C 58mm - - PJ Easy -
RS Stock No. 913-9927
Mfr. Part No.WE00S1EN00
BrandCarel
HK$1,430.23
Each
units
Digital 1 Relay 1 1 230 V ac - 290 x 128mm - - - IP65 Wall Mount - Screw
RS Stock No. 511-7456
Mfr. Part No.IR33Y0LR00
BrandCarel
HK$1,005.69
Each
units
NTC - - - 12 → 24 V ac -50 → +90 °C 76.2 x 34.2mm -10°C +50°C 94mm - - IR33 -
RS Stock No. 745-7942
Mfr. Part No.PJEZS0A000
BrandCarel
HK$882.71
Each
units
NTC - - - 230 V ac -50 → +90 °C 36 x 81mm - - 61mm - - PJ Easy -
RS Stock No. 809-1004
Mfr. Part No.DN33A9MR20
BrandCarel
HK$1,965.16
Each
units
NTC, PT100, PTC - - 4 24 V ac, 30 V dc Carel DN33 110 x 70mm -10°C +60°C 60mm - - DN33 -
RS Stock No. 913-9983
Mfr. Part No.PJEZC0M000
BrandCarel
HK$1,326.12
Each
units
Digital 3 Relay 1 3 230 V ac - 81 x 36mm - - - IP65 Panel Mount - Screw
RS Stock No. 809-0991
Mfr. Part No.DN33Z9MR20
BrandCarel
HK$1,965.16
Each
units
NTC, PT100, PTC - - 4 24 V ac, 30 V dc Carel DN33 110 x 70mm -10°C +60°C 60mm - - DN33 -
RS Stock No. 809-0985
Mfr. Part No.PJEZY0H000
BrandCarel
HK$804.92
Each
units
NTC - - - 230 V ac - 81 x 36mm -10°C +50°C 58mm - - PJ Easy -
RS Stock No. 745-7945
Mfr. Part No.PJEZS6P000
BrandCarel
HK$850.11
Each
units
PTC - - - 230 V ac -50 → +90 °C 36 x 81mm - - 61mm - - PJ Easy -
RS Stock No. 913-9986
Mfr. Part No.PJEZY00000
BrandCarel
HK$835.58
Each
units
Digital 2 Relay 1 2 230 V ac - 81 x 36mm - - - IP65 Panel Mount - Screw
RS Stock No. 745-7939
Mfr. Part No.PJEZSNP000
BrandCarel
HK$809.04
Each
units
NTC - - - 230 V ac -50 → +90 °C 36 x 81mm - - 61mm - - PJ Easy -
RS Stock No. 809-0988
Mfr. Part No.IREVF0EN00
BrandCarel
HK$982.65
Each
units
NTC - - - 230 V ac - 76.2 x 34.7mm - - 79.5mm - - IR33+ -
RS Stock No. 913-9970
Mfr. Part No.PB00F0EP30
BrandCarel
HK$1,107.16
Each
units
- 3 Relay 1 3 230 V ac - - - - - - Panel Mount - Faston, Screw
RS Stock No. 809-1001
Mfr. Part No.IR33S0EN00
BrandCarel
HK$1,011.52
Each
units
NTC - - - 230 V ac - 76.2 x 34.4mm -10°C +60°C 70.5mm - - IR33 -