Building on the success of our popular heavy duty time switch, this unit provides the only plug-in thermostat solution in the UK for high power and inductive loads. Simply plug the unit in between the heater and the supply socket and when the temperature falls below the set threshold, power to the socket is turned on. The unit can also be user set to turn on when the temperature threshold is exceeded, to control cooling fans. Wide temperature range of -15C to +45C, with a hysteresis of 0.5-5C.
Thermostats use a relay, which is a cheap, compact way of controlling resistive loads. Resistive loads do not contain a motor and require a steady amount of current, even on start up e.g. lights.
In contrast, inductive loads contain a motor or coil e.g. fan heaters. When an inductive load is first powered up, it draws a much larger start up current, typically 2.5-3 times its normal operating current. For example a 500w heater may briefly draw 1250-1500w when it starts up. The main issue is actually caused when the relay contacts open to turn the tool off. The stored inductive energy in the motor coil is discharged, resulting in a damaging arc across the terminals, which can eventually cause the relay to fail.
To overcome this issue, instead of using the relay within the thermostat to switch the load directly, our units connect it to a high quality contactor, which then switches the load.
Contactors work using the same principle as a relay, but they are much larger and far better suited to switching higher current inductive loads. The picture below shows the sheer size difference between a typical contactor (left) and relay (right); when it comes to switching inductive loads, contact size really does make a difference.
Contactor rating:
| Unit | Resistive | Inductive |
| 230v 16/32A | 40A (AC-7a) | 15A (AC-7b) |
| 415v 16/32A | 63A (AC-7a) | 20A (AC-7b) |
Where there is a requirement to measure the temperature some distance away from the unit, our Wi-Fi sensor can be used in conjunction with the heavy duty Wi-Fi switch as an alternative solution.
Specification:
- Select from a range of IEC60309 connectors.
- Temperature range -15C to +45C.
- Hysteresis 0.5-5C.
- Dial selects cooling or heating mode, together with a manual override to permanently off or on.
- Gewiss robust IP55 weatherproof DIN enclosure. Dimensions W105mm x H170mm x D98mm). 415v 32A unit uses a larger enclosure W180mm x H180mm x D98mm.
- 0.3m in/out of industrial specification H07RN-F rubber cable, specifically manufactured for harsh environments with high mechanical, chemical, water and UV resistance. Flexibility and performance is retained over a wide temperature range (-25 to 55°C). Find out what’s so special about this cable.
- Please contact us for custom cable lengths or connectors.
- PAT tested.
Manual:
- Click here to download the manual.
Connector Options:
Please use the guide below to ensure that the correct connectors are ordered, using the colour and diameter if unsure.
| Connector | Details |
 |
230v 16A CEE7/7 European
|
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230v 16A IEC 60309
|
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230v 32A IEC 60309
|
|
|
415v 16A IEC 60309
|
 |
415v 32A Red Sockets (IEC 60309)
|
