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  • New item   Transformer fan motor speed controller | 1A | 230VAC | surface-mounted | IP54 | Sentera Controls | STR-1-10L10
    New item   Transformer fan motor speed controller | 1A | 230VAC | surface-mounted | IP54 | Sentera Controls | STR-1-10L10 1
    New item   Transformer fan motor speed controller | 1A | 230VAC | surface-mounted | IP54 | Sentera Controls | STR-1-10L10 2
    New item   Transformer fan motor speed controller | 1A | 230VAC | surface-mounted | IP54 | Sentera Controls | STR-1-10L10 3
    New item   Transformer fan motor speed controller | 1A | 230VAC | surface-mounted | IP54 | Sentera Controls | STR-1-10L10 4
    New item   Transformer fan motor speed controller | 1A | 230VAC | surface-mounted | IP54 | Sentera Controls | STR-1-10L10 5
    New item   Transformer fan motor speed controller | 1A | 230VAC | surface-mounted | IP54 | Sentera Controls | STR-1-10L10 6

    Transformer fan motor speed controller | 1A | 230VAC | surface-mounted | IP54 | Sentera Controls | STR-1-10L10

    Code: STR-1-10L10
    Inquire about this item
    Price 84.05 € VAT incl.
    ( 69.46 € VAT excl. )

    Sentera Controls STR-1-10L10 – a five-step transformer fan motor speed controller designed for single-phase 230 V AC voltage-controllable fans up to 1 A. The controller changes the motor supply voltage in five steps while maintaining a sinusoidal waveform, helping to reduce additional motor hum. The surface-mounted IP54 enclosure, rotary control and protection against automatic restart after a power failure make it convenient for use in indoor ventilation systems. 

  • Product description

    Transformer fan motor speed controller | 1 A | 230 V AC | 5 steps | surface-mounted | IP54 | Sentera Controls | STR-1-10L10

    Sentera Controls STR-1-10L10 – a five-step autotransformer speed controller designed for single-phase 230 V AC fan motors whose speed is controlled by varying the supply voltage. The sinusoidal output voltage helps avoid the additional motor humming typical of electronic phase-angle controllers. Maximum load current – 1 A. The controller has a rotary switch with an OFF position, a green LED indicator, an unregulated 230 V / 2 A output and protection against automatic restart after a power supply interruption. The grey RAL 7035 plastic enclosure with IP54 protection is intended for surface mounting indoors.

    Key point:
    Five-step transformer control allows the fan speed to be selected according to the required airflow. The sinusoidal output voltage reduces additional motor humming, while the IP54 enclosure allows the controller to be installed in more humid indoor areas where condensation does not occur.

    ⚡ Spark: Why is it better to use a transformer speed controller for a fan?

    ⚙ Phase: It changes the motor voltage while maintaining its sinusoidal waveform. This reduces the additional humming typical of electronic phase-angle controllers. The speed is selected in five steps.

    Supply voltage
    230 V AC | 50–60 Hz
    Maximum current
    1 A
    Speed control
    5 steps + OFF
    Enclosure protection
    IP54 | RAL 7035

    Operating principle

    The controller uses an autotransformer that changes the voltage supplied to the fan motor in five fixed steps. This regulates the motor speed and airflow.

    Transformer control maintains the sinusoidal waveform of the output voltage and helps reduce additional motor humming. After a power supply interruption, the controller does not restart automatically – the knob must be returned to position 0 and the speed selected again.

    What are the benefits of this controller?
    It allows convenient control of a single-phase fan speed, reducing airflow and noise when maximum performance is not required. Five speed steps, quiet transformer control and protection against automatic restart provide practical ventilation-system control.

    Technical data

    Electrical parameters
    Manufacturer / model Sentera Controls | STR-1-10L10
    Controller type Autotransformer, 5-step
    Supply voltage 230 V AC / 50–60 Hz
    Maximum motor current 1 A
    Speed control 5 steps + OFF position
    Unregulated output 230 V AC / 2 A
    Output voltage waveform Sinusoidal
    Fuse 5 × 20 mm | T-1.25 A-H
    Operation indicator Green LED
    Protection after power interruption Manual restart
    Enclosure and environmental conditions
    Mounting method Surface-mounted
    Enclosure material R-ABS plastic, UL94-V0
    Colour Grey, RAL 7035
    Protection rating IP54 (EN 60529)
    Operating temperature −20...+35 °C
    Relative humidity 5–95 % RH, non-condensing
    Operating environment Indoor use
    Dimensions according to drawing
    A / B / C 84 / 160 / 88 mm
    D / E 71 / 108 mm

    Main functions

    • Five-step manual fan speed control.
    • Sinusoidal output voltage – reduced additional motor humming.
    • Automatic restart lockout after power failure.
    • Green operating LED indicator.
    • Unregulated 230 V AC / 2 A output.
    • IP54 enclosure and surface mounting.

    Application areas

    • Ventilation systems in residential and commercial premises.
    • Single-phase duct and extraction fans.
    • Ventilation of basements, warehouses and technical rooms.
    • Air extraction in workshops and auxiliary rooms.
    • Systems where reduced fan humming is important.

    Use by requirement

    For the domestic user
    Allows the fan speed to be selected according to the room ventilation requirement and reduces airflow noise.
    For the installer
    The surface-mounted IP54 enclosure, clearly marked connection terminals and five-step control simplify integration into a ventilation system.
    For the engineer / designer
    Suitable for single-phase voltage-controllable 230 V AC motors with a maximum current not exceeding 1 A.

    Practical application

    A single-phase 230 V AC extraction fan whose speed is controlled by changing the voltage is installed in a basement. After connecting the transformer controller, a lower speed can be selected for everyday ventilation and a higher speed when more intensive air extraction is required. The IP54 enclosure allows the controller to be used in a more humid room where condensation does not occur.

    Advantages

    • Quieter motor operation due to sinusoidal voltage.
    • Five fixed speed steps.
    • Protection against automatic restart.
    • IP54 protection rating.
    • Convenient rotary control.
    • Additional unregulated output.

    Limitations

    • Suitable only for voltage-controllable AC motors.
    • Maximum motor current – 1 A.
    • Speed is controlled in steps, not continuously.
    • Not intended for EC or three-phase motors.
    • Intended for indoor use only.

    Installation and electrical connection

    The controller is mounted on a wall or another solid surface. The power supply and motor circuits are connected according to the original wiring diagram.

    Terminal Function
    L / N 230 V AC power supply
    L1 / N Unregulated 230 V AC output
    U / N Regulated output to the fan motor
    PE Protective earth
    Safety note: electrical connection work must be carried out by a qualified specialist after disconnecting the power supply. The motor must be compatible with voltage control and must not exceed a 1 A load. Condensation must not form at the installation location.
    ⚡ Phase tip:
    When selecting a controller, the most important factors are the fan motor type and rated current. STR-1-10L10 is designed for single-phase voltage-controlled AC motors up to 1 A. EC fans with 0–10 V control require a different type of controller.

    Quick selection guide

    230 V AC
    Up to 1 A
    5 steps
    IP54

    Suitable for: single-phase 230 V fan motors whose speed is controlled by changing the voltage and whose rated current does not exceed 1 A.

    Advantage: sinusoidal output voltage, reduced additional motor humming and manual five-step control.

    FAQ – Spark asks, Phase answers

    ⚡ Spark: Is it suitable for any 230 V fan?
    ⚙ Phase: No. The motor must be suitable for voltage control and its current must not exceed 1 A.
    ⚡ Spark: Does the controller reduce motor humming?
    ⚙ Phase: Yes, the sinusoidal output-voltage waveform helps avoid the additional humming typical of phase-angle controllers.
    ⚡ Spark: Can it be installed in a basement?
    ⚙ Phase: Yes, if the temperature is −20...+35 °C, humidity does not exceed 95 % and no condensation occurs.
    ⚡ Spark: Will it switch on after a power failure?
    ⚙ Phase: Not automatically. The knob must be returned to position 0 and the speed selected again.
    ⚡ Spark: Is it suitable for an EC fan?
    ⚙ Phase: No, EC motors with electronic control inputs require a corresponding control device.

    Notes and standards

    Low Voltage Directive 2014/35/EU, EMC 2014/30/EU (EN 61326), RoHS 2011/65/EU, WEEE 2012/19/EU. Enclosure protection IP54 according to EN 60529.

    Sentera Controls STR-1-10L10 – transformer fan speed controller, 1 A, IP54

    Five-step 230 V AC autotransformer controller for single-phase voltage-controllable fans up to 1 A. Sinusoidal output voltage, protection against automatic restart, additional 230 V / 2 A output and IP54 grey plastic enclosure. Intended for surface mounting in indoor ventilation systems.

    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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