Cam switch 25A, three-phase starter switch (0,Y,A), in OB3 enclosure. ŁK25R-4.831\OB3

Three-phase starter switch – reliable motor control

This three-phase cam switch, designated ŁK25R-4.831\OB3, is a robust solution for starting electric motors in a star-delta configuration. Designed for panel or enclosure mounting, it provides safe and efficient motor configuration switching. The OB3 enclosure construction guarantees protection against external factors and increases the device's durability.

Construction and application

The cam switch is used to change the motor winding connection from star to delta, which allows limiting the starting current and smooth motor start. This is particularly important in applications where high starting current could overload the power supply network or damage the motor. The ŁK25R-4.831\OB3 model is ideal for use in industry, workshops, and installations requiring reliable control of three-phase motors.

Key features and benefits

• Durable construction: The housing made of plastic provides resistance to mechanical damage and corrosion.
• High degree of protection: IP65 protection class guarantees protection against dust and water jets, enabling operation in harsh environmental conditions.
• Adapted for mounting: Possibility of indirect and front mounting facilitates integration with existing installations.
• Safe configuration change: The switch allows safe switching between star and delta configuration, minimizing the risk of damage to the motor or electrical installation.
• Rated continuous current 25A: Allows operation of motors up to 13 kW at 400V, providing adequate performance in various industrial applications.
• Wide operating temperature range: The device retains its properties in the temperature range from -40°C to +70°C, making it suitable for use in various climates.
• Solid connections: Screw connection of the main contacts ensures a secure and durable connection of the power supply cables.

Technical parameters in practice

The rated switching power AC-3 is 13 kW at 400V – this means that the switch will easily handle motors of this power, ensuring their correct start and operation. The rated continuous current at 25A guarantees a stable power supply to connected devices. High resistance to external conditions (IP65) means that the device can be used even in humid or dusty environments without the risk of failure. Additionally, the mechanical durability of 3 million switching cycles testifies to the long life of the switch even with intensive use.