400 V motor 2,5 A | 5-speed control | TK monitoring

STRA4 is a 5-step fan speed controller designed for three-phase 400 V motors with thermal contacts. Its maximum combined motor current of 2,5 A. Fan speed is adjusted using a rotary switch with an OFF position. The motor can be enabled or disabled remotely using digital inputs. To ensure motor safety, STRA4 incorporates a TK monitoring function. In case of overheating, the TK monitoring function deactivates the motor to prevent damage. In the event of a power failure, STRA4 features automatic restart. After a power outage, the motor restarts automatically without any manual intervention. STRA4 includes an alarm output and an unregulated output. The alarm output can trigger external devices to generate alarms. The unregulated output can control external devices to confirm normal operation or activate additional equipment. Fan speed is regulated by reducing the motor voltage using autotransformers. This technology ensures that the output voltage has a perfect sine shape, guaranteeing silent operation of the motor and minimizing electrical noise. The enclosure of the STRA4 is designed for surface mounting and has IP54 protection against the ingress of dirt, dust, and moisture.