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  • New item   -211.97€Temperature-based transformer fan motor speed controller | 5A | 230VAC | surface-mounted | IP54 | Sentera Controls | GTT-1-50L22
    New item   -211.97€Temperature-based transformer fan motor speed controller | 5A | 230VAC | surface-mounted | IP54 | Sentera Controls | GTT-1-50L22 1
    New item   -211.97€Temperature-based transformer fan motor speed controller | 5A | 230VAC | surface-mounted | IP54 | Sentera Controls | GTT-1-50L22 2
    New item   -211.97€Temperature-based transformer fan motor speed controller | 5A | 230VAC | surface-mounted | IP54 | Sentera Controls | GTT-1-50L22 3
    New item   -211.97€Temperature-based transformer fan motor speed controller | 5A | 230VAC | surface-mounted | IP54 | Sentera Controls | GTT-1-50L22 4

    Temperature-based transformer fan motor speed controller | 5A | 230VAC | surface-mounted | IP54 | Sentera Controls | GTT-1-50L22

    Code: GTT-1-50L22
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  • Product description

    Temperature-based transformer fan motor speed controller | 5A | 230VAC | surface-mounted | IP54 | Sentera Controls | GTT-1-50L22

    GTT-1-50L22 – Sentera Controls temperature-based transformer fan speed controller for single-phase 230 VAC motors (fans and pumps) up to 5 A. With an integrated 4 m PT500 capillary sensor, two Schuko sockets and a supply cable with plug – connected without terminal wiring.

    Key idea:
    “Plug in and it works”: the fan or pump is plugged into the controller's socket, the sensor is placed in the controlled space, and the desired temperature is set with the potentiometer. In automatic mode the speed changes according to temperature; in manual mode a step is selected.
    What it is for GTT-1-50L22:
    This model is designed for more powerful fans (up to 5 A) – roof or duct fans in warehouses, workshops, halls or a group of fans.
    Max. load current
    5 A
    Control
    According to temperature 15–35 °C / manual
    Connection
    Plug + 2 Schuko sockets
    Protection
    IP54, surface mounting

    Operating principle

    The controller is fixed to the wall via the integrated mounting plate and supplied via a 1.5 m cable with a Euro plug (230 VAC / 16 A). The load is connected to two parallel Schuko IP54 sockets (250 VAC / 16 A), and the PT500 capillary sensor (4 m) is routed into the controlled space.

    The heart of the controller is an autotransformer with several taps (steps). Each step supplies the motor with a different fixed voltage, while the output voltage remains SINUSOIDAL, as in the mains. As a result, the motor runs quietly even at low speed – the transformer speed controller is also suitable for motors that hum or heat up with an electronic (semiconductor) controller.

    The 7-position selector switch selects: 0 – off, manual steps (output voltages in sequence 0-(80)-110-140-170-190-230 VAC; the 80 VAC tap is not connected at the factory) or A – automatic mode. In automatic mode the controller changes the motor voltage in steps according to the sensor temperature: setpoint 15–35 °C via potentiometer, proportional band 5 °C, hysteresis 0.5 °C.

    Control is in steps, not stepless: the speed changes in jumps between fixed voltages. Engineer's note: the speed at each step depends on the motor and fan characteristics, so after commissioning it is worth checking that the motor reliably starts at the lowest step used.

    Benefits GTT-1-50L22?
    A ready-to-use temperature-based ventilation controller: sensor, plug and sockets are already fitted, and the sinusoidal voltage ensures quiet motor operation.

    Technical specifications

    Product type Temperature-based transformer fan speed controller
    Manufacturer / code Sentera Controls / GTT-1-50L22
    Series GTT-1 (3.5 / 5 / 7.5 / 12 A)
    Supply voltage 230 VAC, 50–60 Hz
    Max. load current 5 A
    Output voltage steps 0 – (80) – 110 – 140 – 170 – 190 – 230 VAC (80 VAC tap not connected)
    Output voltage waveform Sinusoidal (autotransformer)
    Modes 7-position selector switch: off, manual steps, automatic
    Temperature setpoint 15–35 °C, potentiometer
    Proportional band / hysteresis 5 °C / 0.5 °C
    Temperature sensor Integrated PT500 capillary, 4 m, 500 Ω at 0 °C, measuring range -30…+70 °C
    Load connection 2 parallel Schuko IP54 sockets, 250 VAC / 16 A
    Supply connection 1.5 m cable with Euro plug, 230 VAC / 16 A
    Fuse 5×20 mm, T-8.0 A-H
    Housing plastic, ABS, UL94-V0, grey RAL 7035
    Protection class IP54 (EN 60529), for indoor use only
    Operating environment 0…+35 °C, < 95 % rH non-condensing
    Dimensions (unit) 341×256×156 mm
    Weight 5.60 kg net / 6.35 kg gross
    Compliance LVD 2014/35/EU, EMC (EN 61326), RoHS 2011/65/EU, WEEE 2012/19/EU

    Manufacturer documentation

    ✔ Recommended by Elektrotechnikos sprendimai

    Original manufacturer documentation – technical data, wiring diagrams and installation instructions.

    Main functions

    • Automatic mode according to temperature – the speed changes in steps according to the PT500 sensor measurement.
    • Manual mode – a fixed step is selected with the selector switch; there is an off position.
    • Integrated 4 m capillary sensor – no separate sensor needs to be purchased or connected.
    • Plug and Schuko sockets – connection without terminal wiring – two parallel sockets for the load.
    • Sinusoidal output voltage – quiet motor operation even at low speed.

    Where is it used?

    • Greenhouses
    • Farm buildings, livestock housing
    • Residential houses, technical rooms
    • Temperature-based control of fans and pumps with single-phase 230 VAC motors

    On-demand operation

    For the farmer and greenhouse owner.
    Ventilation adapts to the temperature by itself – just plug it in and set the temperature.
    For the electrician.
    Factory-fitted cable with plug, Schuko sockets and integrated sensor – minimal installation.
    For the ventilation installer.
    Automatic and manual mode in one device, sinusoidal voltage – quiet operation.

    Application guide: how it is used in practice

    Typical GTT-1-50L22 applications:

    Site What is connected Result Installer's note
    Greenhouse Fan → Schuko socket; sensor – in the plant zone As the temperature rises, the fan runs faster Protect the sensor from direct sunlight
    Livestock room 1–2 fans → both sockets Automatic temperature-based ventilation The total current must not exceed 5 A
    Plant room Extract fan → socket Heat is removed from the equipment Operating environment – up to +35 °C
    Testing / commissioning Selector switch – manual step Fan operation is checked at each step After the check, return to position A

    How to select the controller current

    Rated current of the motor(s) Recommended model
    up to 3.5 A GTT-1-35L22 (3.5 A)
    3.5–5 A GTT-1-50L22 (5 A) ← this model
    5–7.5 A GTT-1-75L22 (7.5 A)
    7.5–12 A GTT-1120L22 (12 A)
    Rule: controller max. current ≥ rated current of the motor (or the sum of several motors) from the motor nameplate. For a transformer controller the motor starting current is already taken into account by the manufacturer, so no additional margin is needed. Connect several fans only with AC motors of the same type that are voltage-controllable.
    When to choose another solution: an electric heater also needs to be controlled – GTTE1 series; a water heater valve and Modbus – GTH21 series; time-based control – ST2R1 series; stepless 0-10 VDC control – electronic EVS-1 series.

    Pros

    • Integrated 4 m PT500 capillary sensor
    • Plug and 2 Schuko sockets – quick connection
    • Automatic and manual mode
    • Sinusoidal output voltage – quiet motor operation
    • Suitable for fans and pumps
    • IP54 enclosure

    Cons / limitations

    • Step, not stepless control
    • Heavy weight (5.60 kg)
    • Temperature setpoint only 15–35 °C
    • Operating environment 0…+35 °C, indoor use only
    • No 0-10 VDC input, Modbus or TK terminals
    • Single-phase voltage-controllable AC motors only; not suitable for EC fans

    Safety and installation notes

    • Installation and connection must be carried out by a qualified electrician with the power disconnected.
    • Always connect the protective earth (PE).
    • The total rated current of the connected motors must not exceed 5 A.
    • Replace the fuse only with one of the same type and rated current as specified in the datasheet.
    • The controller is intended for indoor use only, in clean air free of aggressive and flammable gases.
    • Operating environment 0…+35 °C; do not break the capillary or bend it to a tight radius.
    • Connected to an earthed 230 VAC socket protected by a suitable circuit breaker.

    Quick selection guide

    5 A
    230 VAC
    According to temperature
    PT500 4 m
    IP54
    Suitable when you need:
    • temperature-based control of a fan or pump up to 5 A;
    • greenhouses, farm and technical premises;
    • quick connection without terminal wiring.
    Check before use:
    • the motor rated current and whether it is voltage-controllable;
    • whether the required temperature falls within 15–35 °C;
    • whether the fan cable has a Schuko plug;
    • the ambient temperature (0…+35 °C).
    Important reminder: GTT-1-50L22 does not control EC fans or three-phase motors.

    FAQ

    Is the sensor included?
    Yes, an integrated 4 m PT500 capillary sensor.
    In what temperature range does it operate?
    Temperature setpoint 15–35 °C, proportional band 5 °C, hysteresis 0.5 °C.
    Can it control a pump?
    Yes, the datasheet lists single-phase 230 VAC voltage-controllable pumps and fans.
    Is an electrician required for connection?
    The load is connected to the Schuko sockets and the controller via a plug; however, we recommend entrusting preparation and checking of the fan cable to an electrician.
    Can it be used in manual mode?
    Yes, a fixed step or off is selected with the selector switch.

    Temperature-based transformer fan motor speed controller | 5A | 230VAC | surface-mounted | IP54 | Sentera Controls | GTT-1-50L22

    Sentera GTT-1-50L22 – temperature-based transformer fan speed controller, up to 5 A, 230 VAC, integrated PT500 4 m sensor, setpoint 15–35 °C, plug and 2 Schuko sockets, IP54.

    Illustrative image may have been created using AI. The appearance of the product may differ slightly from the image shown. Please refer to the technical specification.

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