Type SO4

Isolated overload relay alarm contacts are available factory-installed or in kit form for field installation in NEMA Size 00–6 Type S^[1] starters, and Class 9065 Type SE melting alloy overload relays. NEMA Size 7 Type S devices use a solid­state overload relay which has isolated alarm contacts as a standard feature. 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.

The Class 9999 Type SN kit can be used on Class 8903 Type S lighting contactors and other controllers where field addition of a solid neutral is required. Each kit has lugs suitable for both copper and aluminum wire, and mounts with two screws.

Tie Point Terminal Block

The tie point terminal block provides easy wiring of a Hand-Off-Auto selector switch or Start-Stop push buttons with separate control. The T7 terminal block requires no panel space. It simply snaps on Sizes 00–4 Type S contactors and starters by two tabs and is secured to the left hand coil terminal.