Amprobe PSA-1 Phase Sequence Adaptor

The Amprobe PSA‑1 Phase Sequence Adaptor is a compact three‑lead accessory that helps you confirm the rotation of a three‑phase power supply by wiring the Red, Yellow, and Black phase leads to the three lines (in any order) while using the adaptor’s two black leads to connect to your meter. It works with any Amprobe volt‑ammeter or any AC‑voltage capable multimeter, and when paired with a compatible instrument such as the RS‑3, will determine the circuit’s phase sequence. The adaptor is rated for circuits up to 550 V AC and can indicate phase information for systems within that range when the connected instrument’s voltage range exceeds 550 V, with an operating frequency range of about 25–60 Hz. The PSA‑1 package includes a carrying case.