Cam switch 25A, Three-phase starter switch (0,Y,A), in OB2 enclosure with yellow/red sealable front. ŁK25R-4.831\OB2ZC

Three-phase starter switch – reliable motor control

This cam switch 25A, in a robust OB2 housing, is a key element of electrical installations requiring reliable control of three-phase motors. Designed for operation in a 0-Y-∆ (star-delta) system, it enables smooth motor starting, reducing inrush currents and ensuring a longer lifespan of the equipment. The yellow-red front cover provides clear identification and safe use.

Construction and application

A cam switch is a mechanical device used to switch electrical circuits on and off. Model ŁK25R-4.831\OB2 has been designed for mounting in electrical installation enclosures where frequent circuit configuration changes are required, e.g. during the starting of three-phase motors. The design with a knob ensures convenient and precise operation. The IP65 protection rating guarantees resistance to dust and moisture, making it an ideal solution for both indoor and outdoor applications – provided adequate protection against direct exposure to atmospheric agents is ensured.

Key features and benefits

• Durability and reliability: Made of high-quality materials, the switch ensures long-lasting and trouble-free operation even in harsh industrial conditions.
• Safety: The plastic housing and high IP65 protection rating minimize the risk of electric shock and damage to the device.
• Versatility: The 0-Y-∆ switch enables flexible control of three-phase motors, adapting to different application needs.
• Easy installation: The design for indirect mounting simplifies installation and integration with existing electrical systems.
• Suitable for high loads: The rated continuous current of 25A and the rated operating power of 13 kW at 400V allow operation of demanding equipment.
• Durable construction: Withstands high mechanical loads (3 million switching cycles) and temperatures (-40°C to +70°C).
• Short-circuit protection: The conventional rated short-circuit current of 13kA provides protection for the installation in the event of a short circuit.

Technical parameters in practice

A rated continuous current of 25A means that the switch can safely operate with a load of this value for a long time without overheating. The rated operating power of 13 kW at a voltage of 400V indicates its ability to effectively control motors of this power. The IP65 protection rating guarantees protection against water jets and the ingress of dust into the device, which is particularly important in industrial or humid environments. The housing material – plastic – provides lightness and corrosion resistance. The lack of auxiliary contacts (both normally open and normally closed) means that the device focuses on the basic function of switching circuits without additional signaling or remote control capabilities.