Cam switch 20A, Dahlander two-speed switch with direction of rotation change, in OB3 housing. SK20-7.8538\OB3

Cam switch – reliable change of motor direction and speed

This cam switch, catalog number SK20-7.8538\OB3, is a key element in electrical installations requiring precise control of motors. It is a Dahlander dual-speed switch with reversing, housed in a robust OB3 enclosure. The device is designed for applications requiring frequent changes in direction of rotation or selection of two motor speeds.

Functionality and application

The Dahlander switch allows you to change the direction of rotation and select two motor speeds, making it an ideal solution in applications such as:

• Control of drives in machines and industrial equipment.
• Operation of hoists, winches and other transport equipment.
• Applications in building automation, e.g. control of blinds or gates.
• Ventilation and air conditioning systems, where fan speed adjustment is required.

The design allows for easy installation and integration with existing electrical installations. The OB3 housing provides protection against external conditions, increasing the durability and reliability of the device.

Technical characteristics and benefits

The cam switch SK20-7.8538\OB3 is characterized by high technical parameters, ensuring safe and efficient operation:

• Rated insulation voltage (Ue): 690 V – ensures safe use in various electrical installations.
• Rated continuous current (Iu=Ith): 16 A – allows use with loads with significant power.
• Rated switching current (Ie) in category AC-21A/AC-22A: 10 A (at voltages 230/400/500/690 V) – guarantees reliable switching of alternating current circuits.
• Rated switching power (Pe) in category AC-23A: 2 kW (230 V), 4 kW (400 V), 5 kW (500 V), 6 kW (690 V) – allows control of motors with different power.
• Mechanical endurance: The switch design provides high resistance to mechanical damage and long life even with intensive use.
• Environmental resistance: The OB3 housing protects against dust and moisture, increasing the reliability of the device in harsh working conditions.

Thanks to these features, the cam switch SK20-7.8538\OB3 is a solid and effective solution for professionals and end users looking for a reliable element for controlling electric motors.