The Motion Laboratories 1175-01-003-202-0002 is a professional-grade stringer box, a specialized type of power distribution unit (PDU) engineered for the rigorous demands of entertainment and event production power distribution. Its primary function is to safely split a single high-capacity, three-phase power feed into multiple, individually protected 120-volt circuits to supply lighting, audio, and other stage equipment. The unit accepts a primary input via a NEMA L21-30 connector, a locking plug that provides 30 amps of 120/208-volt, three-phase, four-wire power, which is the standard for theatrical and studio distribution systems. This input is then passed through an internal bus to individual 20-amp circuit breakers, each protecting a standard NEMA 5-20R Edison duplex receptacle.

This specific configuration features six separate 20-amp circuits, each with its own duplex outlet, allowing it to power up to twelve individual 120V devices or a combination of devices drawing up to the breaker limit per circuit. A critical safety and functionality feature is the inclusion of an L21-30 "Thru" or output connector. This allows the box to be daisy-chained, passing the full incoming power capacity downstream to another distribution box, enabling the creation of extended power distribution chains from a single company switch or generator tie-in. The unit is built into a heavy-duty, road-ready metal enclosure designed to withstand the physical abuse of touring, including reinforced corners, robust handles, and a dead-front design that protects users from exposed live parts.

Every aspect of the stringer box is designed for clarity and safety in a fast-paced production environment. Outlets are clearly labeled and often color-coded to correspond with circuit breakers. The front-accessible breakers allow for quick visual confirmation of status and easy reset in case of an overload. The internal wiring adheres to strict NEC (National Electrical Code) standards, particularly Article 520 for theatrical applications, ensuring proper grounding, phase distribution, and overcurrent protection. This Motion Laboratories stringer box provides a reliable, organized, and code-compliant method for delivering clean, protected AC power to critical production equipment on stage, in studios, or at temporary events.