Type S magnetic contactors and starters are for motor control applications. This isolated overload relay alarm contact is available factory installed or as a kit for field installation. This kit will work with melting alloy overload relays used on Type S NEMA size 00 through 6 starters. This module has a normally open isolated alarm contact and a standard normally closed overload relay contact. The case is made of clear plastic to allow for visual inspection of the contacts. This module is UL component recognized.