Cam switch 40A, Dahlander two-speed switch with reverse rotation, in OB3 housing. SK40-7.8538\OB3

40A Rotary Cam Switch – Reliable Direction of Rotation Change

This rotary cam switch is a robust solution for controlling electric motors with a rated current of 40A. Designed for industrial applications, it allows for changing the direction of rotation and disconnecting the power supply (L-0-P switch). Mounting in a durable OB3 enclosure provides protection against mechanical damage and external factors. The device is particularly useful in applications requiring frequent changes in motor operating direction, such as forklift, gate, or production machine drives.

Design and operating parameters

The rotary cam switch SK40-7.8538\OB3 is characterized by high reliability and durability. Made of high-quality materials, it ensures stable operation even in harsh conditions. Rated insulation voltage of 690V and high impulse withstand voltage (6kV) guarantee safe operation. The Dahlander's two-speed switch with direction of rotation change allows for precise control of the motor's operation, adapting its speed and direction to current needs. The device allows controlling motors up to 20 kW at 400V, 14 kW at 500V and 7 kW at 690V. It also provides resistance to momentary overloads thanks to a short-circuit withstand rated current of 0.85 kA. Long service life is guaranteed by a mechanical durability of 3 million switching cycles, and a wide operating temperature range from -40°C to +70°C enables use in various environmental conditions. Protection class IP41/IP65 protects against the ingress of solids and water, which is important in industrial environments.

Installation and application

The Spamel SK40 OB3 rotary cam switch is easy to install thanks to standard mounting holes. The cross-section of the connection cables 4...10 mm² allows connection of cables of different thicknesses. The device finds application in:

• Controlling electric motors in industrial machines and equipment
• Drives for forklifts and other transport equipment
• Building automation systems
• Applications requiring frequent changes in motor direction of rotation
• Disconnectors for electrical circuit power supplies

Thanks to its solid construction and high technical parameters, the SK40 OB3 rotary cam switch is an investment in reliable and safe control of electric motors.