{"product_id":"vents-single-phase-switchboard-with-speed-controller-rsa5e-4-m","title":"VENTS RSA5E-4-M – 5-step single-phase transformer fan controller, 4A","description":"\u003cp\u003e\u003cstrong\u003eVENTS RSA5E-4-M\u003c\/strong\u003e is a professional \u003cstrong\u003e5-step transformer speed controller\u003c\/strong\u003e designed to control single-phase AC fans with a maximum rated current of up to \u003cstrong\u003e4 A\u003c\/strong\u003e. The speed is selected using a mechanical rotary switch, while autotransformer control ensures stable and reliable motor operation. The model has \u003cstrong\u003ebuilt-in motor-overheating protection\u003c\/strong\u003e and can be connected to a thermostat and air-damper actuator.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eVENTS RSA5E-4-M\u003c\/strong\u003e is designed to regulate the airflow of compatible single-phase fans by changing the motor speed. Unlike conventional electronic controllers, the model uses a \u003cstrong\u003etransformer control principle\u003c\/strong\u003e and offers five predefined operating steps.\u003c\/p\u003e\n\n\u003cp\u003eThe desired speed is set using a \u003cstrong\u003emechanical rotary switch on the front panel\u003c\/strong\u003e. This makes control easy and allows the airflow to be adapted to the specific needs of the ventilation system – for example, a lower speed under normal conditions and a higher speed when intensive air exchange is needed.\u003c\/p\u003e\n\n\u003cp\u003eOne of the important advantages of the RSA5E-4-M is its \u003cstrong\u003eintegrated motor protection\u003c\/strong\u003e. The controller can operate with the thermal contacts of a compatible fan. If the motor's thermal relay is triggered because of overheating, power to the fan is interrupted. Once conditions return to normal, the power supply is restored automatically.\u003c\/p\u003e\n\n\u003cp\u003eIt also has \u003cstrong\u003eadditional terminals for connecting an external thermostat or air-damper motor\u003c\/strong\u003e, allowing the controller to be integrated into more complex climate-control and ventilation installations.\u003c\/p\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eRSA5E-4-M has a metal casing\u003c\/strong\u003e and is designed for surface wall mounting. Its protection rating is \u003cstrong\u003eIP21\u003c\/strong\u003e, and the permitted ambient operating temperature is from \u003cstrong\u003e+5°C to +40°C\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cp\u003e \u003c\/p\u003e\n\n\u003ch2\u003e\u003cstrong\u003eTechnical specifications\u003c\/strong\u003e\u003c\/h2\u003e\n\n\u003cp\u003e✔️ \u003cstrong\u003eManufacturer:\u003c\/strong\u003e VENTS\u003cbr\u003e\n✔️ \u003cstrong\u003eModel:\u003c\/strong\u003e RSA5E-4-M\u003cbr\u003e\n✔️ \u003cstrong\u003eType:\u003c\/strong\u003e Transformer speed controller\u003cbr\u003e\n✔️ \u003cstrong\u003eControl:\u003c\/strong\u003e Stepped\u003cbr\u003e\n✔️ \u003cstrong\u003eNumber of speeds:\u003c\/strong\u003e \u003cstrong\u003e5\u003c\/strong\u003e\u003cbr\u003e\n✔️ \u003cstrong\u003ePhases:\u003c\/strong\u003e 1\u003cbr\u003e\n✔️ \u003cstrong\u003eSupply voltage:\u003c\/strong\u003e \u003cstrong\u003e230 V \/ 50 Hz\u003c\/strong\u003e\u003cbr\u003e\n✔️ \u003cstrong\u003eRated motor voltage:\u003c\/strong\u003e \u003cstrong\u003e230 V \/ 50 Hz\u003c\/strong\u003e\u003cbr\u003e\n✔️ \u003cstrong\u003eMaximum rated load:\u003c\/strong\u003e \u003cstrong\u003e4.0 A\u003c\/strong\u003e\u003cbr\u003e\n✔️ \u003cstrong\u003eFuse:\u003c\/strong\u003e \u003cstrong\u003e5.0 A\u003c\/strong\u003e\u003cbr\u003e\n✔️ \u003cstrong\u003eProtection rating:\u003c\/strong\u003e \u003cstrong\u003eIP21\u003c\/strong\u003e\u003cbr\u003e\n✔️ \u003cstrong\u003eOperating temperature:\u003c\/strong\u003e \u003cstrong\u003e+5°C to +40°C\u003c\/strong\u003e\u003cbr\u003e\n✔️ \u003cstrong\u003eCasing:\u003c\/strong\u003e Metal\u003cbr\u003e\n✔️ \u003cstrong\u003eMounting:\u003c\/strong\u003e Surface wall mounting\u003cbr\u003e\n✔️ \u003cstrong\u003eDimensions:\u003c\/strong\u003e \u003cstrong\u003e241 × 184 × 132 mm\u003c\/strong\u003e\u003cbr\u003e\n✔️ \u003cstrong\u003eWeight:\u003c\/strong\u003e \u003cstrong\u003e4.5 kg\u003c\/strong\u003e\u003cbr\u003e\n✔️ \u003cstrong\u003eTerminals:\u003c\/strong\u003e screw type, \u003cstrong\u003e0.5–2.5 mm²\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cp\u003e \u003c\/p\u003e\n\n\u003ch2\u003e\u003cstrong\u003e🛡️ Functions and protections\u003c\/strong\u003e\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eRSA5E-4-M offers more than ordinary speed control:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003e✔️ \u003cstrong\u003e5-step adjustment\u003c\/strong\u003e of the fan speed\u003cbr\u003e\n✔️ Mechanical rotary switch\u003cbr\u003e\n✔️ \u003cstrong\u003eIntegrated motor overheat protection\u003c\/strong\u003e\u003cbr\u003e\n✔️ Automatic power restoration after the temperature returns to normal\u003cbr\u003e\n✔️ Option to connect a \u003cstrong\u003ethermostat\u003c\/strong\u003e\u003cbr\u003e\n✔️ Option to control an \u003cstrong\u003eair-damper actuator\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cp\u003e \u003c\/p\u003e\n\n\u003ch2\u003e\u003cstrong\u003e🔧 Applications\u003c\/strong\u003e\u003c\/h2\u003e\n\n\u003cp\u003eVENTS RSA5E-4-M is suitable for controlling compatible single-phase fans in:\u003c\/p\u003e\n\n\u003cp\u003e• Greenhouses\u003cbr\u003e\n• Nurseries\u003cbr\u003e\n• Warehouses\u003cbr\u003e\n• Production facilities\u003cbr\u003e\n• Workshops\u003cbr\u003e\n• Technical rooms\u003cbr\u003e\n• Supply ventilation systems\u003cbr\u003e\n• Extract ventilation systems\u003cbr\u003e\n• Other professional systems where stepped air-flow control is required.\u003c\/p\u003e\n\n\u003cp\u003e \u003c\/p\u003e\n\n\u003ch2\u003e\u003cstrong\u003e🔌 Operating principle\u003c\/strong\u003e\u003c\/h2\u003e\n\n\u003cp\u003eWhen a different position is selected on the rotary switch, the controller supplies a different voltage to the fan motor. In this way, the speed and therefore the \u003cstrong\u003eair flow change in five distinct stages\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cp\u003eThis type of control is particularly suitable for compatible AC motors when reliable adjustment is required without the need for complex electronics.\u003c\/p\u003e\n\n\u003cp\u003e \u003c\/p\u003e\n\n\u003ch2\u003e\u003cstrong\u003e📋 Installation and use\u003c\/strong\u003e\u003c\/h2\u003e\n\n\u003col\u003e\n\t\u003cli\u003eMount the controller vertically on a stable wall.\u003c\/li\u003e\n\t\u003cli\u003eConnect the power supply and fan to the corresponding terminals according to the VENTS wiring diagram.\u003c\/li\u003e\n\t\u003cli\u003eIf the motor has suitable thermal contacts, connect them to the controller's protection circuit.\u003c\/li\u003e\n\t\u003cli\u003eIf necessary, connect an external thermostat or air-damper actuator.\u003c\/li\u003e\n\t\u003cli\u003eAfter checking the electrical installation, switch on the power supply.\u003c\/li\u003e\n\t\u003cli\u003eSelect the required speed using the rotary switch.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003cp\u003e⚠️ \u003cstrong\u003eImportant:\u003c\/strong\u003e The maximum rated load of the \u003cstrong\u003eRSA5E-4-M is 4.0 A\u003c\/strong\u003e. Before connection, the fan motor's rated current and its compatibility with transformer control must be checked. Electrical connection should be carried out according to the manufacturer's diagram and requirements.\u003c\/p\u003e\n\n\u003cp\u003e💡 \u003cstrong\u003eTip from Urban Botaniks:\u003c\/strong\u003e A transformer controller is a good choice for ventilation systems where the fan does not need to run constantly at maximum speed. Selecting a suitable lower stage can reduce air flow and noise, while maximum speed remains available for periods when more intensive air exchange is needed.\u003c\/p\u003e\n\n\u003cp\u003e \u003c\/p\u003e","brand":"Vents","offers":[{"title":"Default Title","offer_id":55115718164822,"sku":"6260","price":1307.0,"currency_code":"RON","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1055\/7190\/9974\/files\/vents-monofazno-tablo-s-regulator-na-skorost-rsa5e-4-m.webp?v=1787849750","url":"https:\/\/urbanbotaniks.ro\/en\/products\/vents-single-phase-switchboard-with-speed-controller-rsa5e-4-m","provider":"UrbanBotaniks Grow Shop","version":"1.0","type":"link"}