Siemens NSB 11RD3B Three-Phase Manual Motor Starter

Siemens NSB 11RD3B is a three-pole manual motor starter rated for 575 V at 50/60 Hz, supporting a 3.5–5 A continuous current and a 3 HP motor load in a compact NEMA 1 enclosure for indoor use. Designed for panel-mounted control, it provides manual on/off operation across all three phases (3P) to switch small three-phase motors. The unit’s NEMA 1 enclosure and wall-mount footprint suit compact control panels in light-duty applications where a simple, local motor control device is required. When selecting this starter, ensure your motor's full-load amperage sits within the 3.5–5 A window to maintain safe coordination with connected protection devices. This model is part of Siemens NSB/11RD3B family of manual starters, which are designed for indoor, panel-mounted motor control tasks. Typical mounting is on standard electrical panels, with the ability to integrate with common protection schemes in the same enclosure.