R-K Electronics ZVM-600R Zero Speed Switch

The R-K Electronics ZVM-600R Zero Speed Switch is a compact, chassis‑mount relay device designed for zero‑speed sensing in rotating equipment, delivering a clear control signal when a shaft stops to drive safety or process‑control circuits. It runs from a 115 VAC supply and employs an MV relay rated for 120 VAC, with an adjustable input threshold described as 40–400 mV for the zero‑speed detection point, while the signal circuit itself can accept up to 600 VAC. The unit features screw‑terminal connections for easy wiring and is intended for chassis mounting in industrial panels, with an operating temperature range of 0°C to 65°C. Model ZVM‑600R is part of R‑K Electronics’ line of zero‑speed switches, designed to reliably sense a stationary shaft and trigger downstream safety or monitoring logic. For reference, the product datasheet is listed as ZVM‑600R.pdf, and the device is available through several distributors, underscoring its role in protective relays and monitoring systems within industrial control architectures.