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  • New item   -20.05€Modular electronic fan speed controller | 2.5A | 230VAC | DIN rail | IP30 | Sentera Controls | DRX-1-25-AT
    New item   -20.05€Modular electronic fan speed controller | 2.5A | 230VAC | DIN rail | IP30 | Sentera Controls | DRX-1-25-AT 1
    New item   -20.05€Modular electronic fan speed controller | 2.5A | 230VAC | DIN rail | IP30 | Sentera Controls | DRX-1-25-AT 2

    Modular electronic fan speed controller | 2.5A | 230VAC | DIN rail | IP30 | Sentera Controls | DRX-1-25-AT

    Code: DRX-1-25-AT
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  • Product description

    Modular electronic fan speed controller | 2.5A | 230VAC | DIN rail | IP30 | Sentera Controls | DRX-1-25-AT

    DRX-1-25-AT – Sentera Controls modular electronic fan speed controller with a knob on the front panel, for DIN rail mounting. Controls single-phase voltage-controllable AC motors up to 2.5 A.

    Key idea:
    Manual speed controller for a control panel: the knob is on the panel front, so the speed can be changed without opening the panel cover and without installing a separate wall-mounted controller.
    What it is for DRX-1-25-AT:
    This model is designed for medium-power fans (up to 2.5 A) – duct fans in offices, classrooms, retail premises or 2–3 smaller fans together.
    Max. motor current
    2.5 A
    Control
    Knob, max.→min.
    Power supply
    230 VAC ±10 %, 50–60 Hz
    Installation
    DIN rail (EN 50022), IP30

    Operating principle

    The controller clips onto a DIN rail. Connect the power supply (L, N) and the motor (U, N); the unregulated L1 output (230 VAC, 0.5 A) can power a lamp or another small load.

    Electronic control: the motor supply voltage is varied from 230 VAC down to the set minimum limit; the output voltage is not purely sinusoidal.

    Turning the knob decreases the speed from maximum to minimum. Fully to the left – OFF position (with the supply connected to L1). The minimum voltage is set with a trimmer (factory setting 100 VAC).

    Engineer's note: with an AC induction motor, reducing the voltage increases rotor losses, so the savings are lower than with an EC fan or a frequency inverter; when completely silent operation at low speed is essential, choose a transformer controller with a sinusoidal output voltage.

    Benefits DRX-1-25-AT?
    Compact DIN module with a knob – a quick and tidy solution when fan control must be located in the control panel.

    Technical specifications

    Product type Modular electronic fan speed controller
    Manufacturer / code Sentera Controls / DRX-1-25-AT
    Series DRX-1 (1.5 / 2.5 A)
    Supply voltage 230 VAC ±10 %, 50–60 Hz
    Max. motor current 2.5 A
    Regulated output 230 → 100 VAC (min. set by trimmer)
    Unregulated output (L1) 230 VAC, max. 0.5 A
    Control Knob on the front, direction max.→min., OFF – fully to the left
    Indication Green LED – operation
    Protection Fuse F 5 A H, 5×20 mm
    Protection class IP30
    Operating environment 0…+40 °C
    Installation DIN rail EN 50022, indoor use only
    Cables Up to 2.5 mm²
    Weight 0.11 kg (net)
    Compliance LVD 2014/35/EU (EN 60335-1), EMC 2014/30/EU (EN 61000-6-2/-3, EN 60730-1), RoHS 2011/65/EU

    Manufacturer documentation

    ✔ Recommended by Elektrotechnikos sprendimai

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

    Main functions

    • Knob on the control panel front – speed is changed without opening the control panel.
    • OFF position – the fan can be switched off with the same knob.
    • Adjustable min. speed – set with a trimmer so that the motor always starts.
    • Unregulated L1 output – for an indicator lamp or a small load up to 0.5 A.
    • Compact DIN module – takes up little space in the control panel.

    Where is it used?

    • Ventilation and automation control panels
    • Plant rooms, boiler rooms
    • Workshops and warehouses with a central control panel
    • Duct fans with AC motors

    On-demand operation

    For the panel builder.
    Standard DIN module with a knob on the front.
    For the electrician.
    Simple connection, no programming.
    For maintenance staff.
    Speed is changed directly in the control panel.

    Application guide: how it is used in practice

    Typical DRX-1-25-AT applications:

    Site What is connected Result Installer's note
    Ventilation control panel Fan → U, N Speed is adjusted in the control panel Set the min. speed with the trimmer
    Indication on the control panel front Lamp → L1 You can see that the fan is switched on L1 load – up to 0.5 A
    Fan switch-off Supply to L1 (OFF mode) Knob fully to the left – fan switched off In that case, do not connect the supply to L

    How to select the controller current

    Rated current of the motor(s) Recommended model
    up to 1.5 A DRX-1-15-AT (1.5 A)
    1.5–2.5 A DRX-1-25-AT (2.5 A) ← this model
    Rule: controller max. current ≥ motor rated current (see the motor nameplate). The starting current is already accounted for by the manufacturer; no additional margin is needed. When connecting several fans – motors of the same type – add up their rated currents.
    When to choose another solution: for higher current or automation with 0-10 VDC / Modbus in a control panel – MVS-1 series (up to 10 A); for digital control with a display – DRE-1-25-DT; for wall mounting – MTXN0 / LTX series.

    Pros

    • Knob on a DIN module
    • OFF position
    • Adjustable min. speed
    • Unregulated L1 output
    • Very compact

    Cons / limitations

    • Low current – up to 2.5 A
    • L1 output only 0.5 A
    • No 0-10 VDC input and no Modbus
    • IP30 – in control panel only
    • The output voltage is non-sinusoidal – some motors may hum audibly at low speed

    Safety and installation notes

    • Installation and connection must be carried out by a qualified electrician with the power disconnected.
    • Check that the motor is suitable for voltage control and that its current does not exceed 2.5 A.
    • When using the OFF position, the supply is connected only to L1, not to L.
    • Intended for control panel installation only, indoors.

    Quick selection guide

    2.5 A
    230 VAC
    Knob
    DIN rail
    Suitable when you need:
    • manual speed control from the control panel;
    • fan current up to 2.5 A;
    • a compact DIN module.
    Check before use:
    • the motor current and whether it is voltage-controllable;
    • whether an OFF position is required;
    • space in the control panel.
    Important reminder: DRX-1-25-AT does not control EC fans or three-phase motors.

    FAQ

    Can the fan be switched off with the knob?
    Yes, in the fully left position, when the supply is connected to L1.
    What is the minimum speed?
    Set with a trimmer, factory setting – 100 VAC.
    Is it suitable for EC fans?
    No, only for single-phase voltage-controllable AC motors.

    Modular electronic fan speed controller | 2.5A | 230VAC | DIN rail | IP30 | Sentera Controls | DRX-1-25-AT

    Sentera DRX-1-25-AT – modular DIN rail fan speed controller with a knob, up to 2.5 A, 230 VAC, with OFF position, adjustable min. speed and L1 output.

    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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