STATES Type SJK Test Switches have long been used for providing a reliable, simple means to test meters, relays and instrument transducers and for control system calibration, disconnection, troubleshooting, checkout and testing. Make-before-break short-circuiting elements for current transformer circuits and test jacks are available. Each switch blade can be operated independently or, where necessary, adjacent handles can be ganged for simultaneous operation. All configurations are available in front-connected, backconnected or flush-mounted styles.

Front-connected switches usually are mounted on the same side of the panel as the wiring. Back-connected switches are mounted on one side of the panel, and the wiring is on the other side. As an option, clear or opaque plastic covers are available for both front-connected or back-connected switches.

Flush-mounted switches match flush- or semiflush-mounted relays, meters, etc., furnished on steel panelboards. They consist of a back-connected switch mounted in an insulated metal cabinet with cover.