This is a manual about Stromag Getriebe-Nocken-Endschalter 51/51 DZ
The document describes the Stromag Series 51 and 51 DZ Geared Cam Limit Switches, which are universal mechanical switching devices used to convert shaft revolutions into specific angles of rotation for operating contacts. These switches are particularly suited for applications where direct angle limitation is not possible, such as limiting the hook travel of crane hoisting gear, or where positive opening contacts are required for safety according to EN 60947 and IEC 947 standards.
Key features include a patented planetary gearing system with self-locking worm adjustment, modular construction using identical components for both gears and housing, and a patented block adjustment mechanism. The switches are available in various housing variants including aluminium castings and plastics modules (B3, B14, B5), and offer options like potentiometer drives, indicating plates, and anti-condensation heaters.
| Quality Standard | EN ISO 9001 |
|---|---|
| Approval (Standard) | Germanischer Lloyd No. 11300-98 HH |
Yes, they are used where positive opening switching contacts are required according to EN 60947 and IEC 947 standards.
These switches are mechanical devices that convert a large number of shaft revolutions into specific rotation angles of built-in cam discs to operate contacts.
They are used wherever angles or routes cannot be directly limited by closing devices but only indirectly via measurements of the angle of rotation of a shaft.
A classic example is the limitation of the hook travel of crane hoisting gear.