Class 9999 Isolated Alarm Contacts

Isolated overload relay alarm contacts are available factory-installed or in kit form for field installation in NEMA Size 00–6 Type SIsolated alarm contacts cannot be added in the field to the Size 5 Type S starter. Current transers and a Size 1 overload block must be used. For factory installation specify Form Y342.* starters that are factory installed with a Class 9065 Type SE melting alloy overload relay. NEMA Size 7 Type S devices use a solid­state overload relay which has isolated alarm contacts as an optional feature. See the table Isolated Auxiliary Contacts for Motor Logic Overload Relays. The alarm contacts allow the starter to be used in applications that require isolated contacts, such as inputs to a computer.

Class 9999 Types SO4 and SO5 modules are interchangeable with the standard module (Class 9998 Type SO1) and can be installed on starters already in service. The case is made of clear plastic (polycarbonate) to allow for visual inspection of contacts.