System II Modular Metal-Enclosed Switchgear

Contruction Details — Switch Operators and Controls

Type MS Switch Operators provide high-speed automatic trip-open operation of Mini-Rupter® Switches . . . interrupting time is 4 cycles. Type MS operators are available in a choice of manual or automatic trip-closed operation.

Type MS-2 Switch Operators are ideal for use with the Micro-AT® Source-Transfer Control. The Micro-AT Source-Transfer Control minimizes interruptions resulting from the loss of one source . . . transfer is achieved in as little as 20 to 25 cycles. Available with a wide choice of options.

Type ZSD Overcurrent Relays, applied on individual load feeders, protect three-phase loads from single-phasing caused by blown fuses. Superior to ordinary overcurrent relays, it can distinguish between fault current and transformer magnetizing inrush current.