States Electric Manufacturing Co C3-203-D Test Switch

States C3-203-D Test Switch is a three-pole device rated for 30 A at up to 600 VAC, designed to provide safe, test-only access within panelboards and switchboards without disturbing permanent wiring. It is part of the STATES MTS line of multi-pole test switches and is referenced in States catalogs among other three-pole test switches; the "270-3" variant code appears in some listings for this model. This switch enables calibration, disconnection, troubleshooting, checkout, and testing of meters, relays, instruments, transducers, and control systems in industrial and commercial electrical installations. The three-pole configuration supports testing across multiple conductors in a single unit, making it suitable for meter testing and instrument checks in panel-mounted applications, where reliable test access is required while maintaining system integrity. States, a brand under Megger, positions these switches to support safe, repeatable test sequences in metering and control hardware across a variety of panel and switchgear environments.