Open & Reversing Contactors
Series CA4 Miniature Contactors: to 7 1/2 HP
An ingenious miniature contactor and starter system
Sprecher + Schuh’s CA4 Series of miniature contactors and starters provide an extremely compact and reliable method of controlling motors of 7.5 HP or less @460V (10HP or less @ 575V). The CA4 is an economical choice for applications where space is limited or where a minimal enclosure is desired.
Small but rugged
Even though their contacts and coils are not replaceable, Sprecher + Schuh has subjected this series of contactors to monitored endurance tests that demonstrate their ruggedness. At full load, under 3-phase power, the contacts in the CA4 have an electrical life of 700,000 operations, while the AC magnet system has a mechanical life of 10,000,000 operations.
The CAT4 starter — efficient and reliable
This miniature starter features the new CT4 Thermal Overload Relay. A complex current limiting calibration procedure performed after each unit is what ensures the consistent high quality of Sprecher + Schuh's thermal overloadrelay. Today's, Class 10 T-frame designlike the CT Series has been recognized by many motor manufacturers as the ideal type to assure optimum motorprotection due to less use of copper and iron. For a complete descriptionof Sprecher + Schuh CT4 Overload Relays, see the e-catalog section.
Accessories require no additional panel space
The entire CA4 System is logically engineered. Modular accessories like auxiliary contact blocks and timing elements snap-on without increasing the CA4’s original width of 45mm. Also, due to its sideways switching movement, the basic contactor has the same low profile whether an AC or DC operating magnet is used. This permits the use of enclosures with shallow mounting depths. Once the CA4 is installed, all auxiliary contact blocks can be snapped-on or removed without changing any existing power wiring.
Effortless installation
Both the CA4 Contactor and the CAT4 Starter are DIN-rail mountable for instant installation and modification. Fittings are also included on the CA4 for base mounting.
International Standards and Approvals
All Sprecher + Schuh contactors are UL-listed and CSA-approved. They also carry the CE mark and meet IEC 9471 requirements. They are approved in virtually every international market.