This document introduces the geared cam limit switches of series 51 and 51 DZ. The product is made of plastic or aluminum cast material and features precision and easy adjustment.
The Stromag Series 51 and 51 DZ are universal mechanical switching devices designed to convert shaft revolutions into specific angular positions on cam discs. These switches operate mechanical contacts based on the rotation angle of a shaft, making them ideal for applications where angles or distances cannot be directly limited by closing devices but must be measured indirectly via rotational angle. A classic application mentioned is limiting the hook travel of crane hoisting gear.
Key features include a patented planetary gearing system with low friction and self-locking worm adjustment, ensuring precise positioning. The switches feature a modular design for economical manufacturing and flexible assembly. Additionally, they offer a patented block adjustment mechanism that allows all switching contacts to be adjusted simultaneously without altering the relative positions of individual contact points.
They are used wherever angles or routes cannot be directly limited by closing devices but only indirectly via measurements of the angle of rotation.
Yes, they are recommended where positive opening switching contacts are required according to EN 60947 part 5-1 and IEC 947-5-1 due to danger to persons.
They utilize a patented planetary gearing system with irreversible, self-locking worm adjustment.