Circuit-Isolator II™ Disconnect

Introduction

S&C’s Circuit-Isolator II Disconnect provides three-pole, group-operated, visible-air-gap isolation in distribution substations. The Circuit-Isolator II can be used to interrupt low-level charging currents associated with substation buswork and circuit-breaker bushings, as well as other low-voltage currents commonly present in substations. It’s ideally suited for use with S&C Trans-Rupter II® Transformer Protector and S&C Type SMD® Power Fuses.

Circuit-Isolator II is available in ratings from 69 through 138 kV, in 1200-, 1600-, and 2000-ampere versions. Side-break, vertical-break, center-break, and double-break styles can be furnished, to suit almost any substation layout. All are designed for upright mounting . . . and S&C Mounting Pedestals are available.

Features and Benefits

• Based on robust contact and blade design of Mark V, Mark VI, and Series 2000 Circuit-Switchers. And S&C Alduti-Rupter Switches.
• Ideal for isolating transformers, circuit breakers, and other substation equipment for repair and maintenance.
• Can be used in sectionalizing schemes when power operated by a Type DS-1 Switch Operator.
• Each disconnect is factory-assembled and adjusted for easy installation.
• Can be custom engineered for mounting on almost any customer-supplied structure.