Cam switch 40A, three-phase starter switch (0,Y,A), base mounting rail front grey knob black SK40-4.831\BS03

Motor starter switch – reliability and safety

This three-phase cam switch with a rated current of 40A is a solid solution for controlling motor starting, especially in star-delta circuits. The design allows for changing the direction of rotation and ensures safe starting of motors up to 12 kW (for AC-3, 400V). Made of durable plastic, it is resistant to mechanical damage and ensures long-term operation.

Functionality and mounting

The switch is designed for easy mounting on a TH35 rail. The front construction with a black knob, housed in a gray enclosure, provides convenient operation and clear identification. The IP65 protection rating guarantees protection against dust and water jets, making it an ideal solution for both indoor and harsh industrial environments. The lack of return to the 0 position means that the switch remains in the selected position until the setting is manually changed.

Applications and benefits

This cam switch finds application in a wide range of electrical installations, primarily where control of three-phase motors is required. Its versatility makes it readily chosen by installers and end-users.

• Versatility: the ability to operate in a star-delta configuration increases the range of applications.
• Durability: the plastic housing provides resistance to mechanical damage and weather conditions (IP65).
• Safety: the high IP65 protection rating protects against electric shock and damage to the device.
• Easy mounting: the ability to mount on a TH35 rail simplifies and speeds up installation.
• Reliability: the solid construction guarantees long-term and trouble-free operation.
• Clarity: clear markings facilitate operation and identification of settings.

Additionally, the lack of auxiliary contacts allows for simplifying the installation diagram in applications where they are not required. The rated switching power Pe in category AC-3 is 20 kW (400 V), which confirms its efficiency and ability to handle even demanding loads. The short-circuit rated current Icw(1s) is 0.85 kA, providing additional safety during short circuits.