The SM852B 3-phase rotation tester is a digital phase indicator detector designed to verify phase sequence and detect open phases in three-phase electrical systems. It features LED indicators and a buzzer to clearly show phase status, with a green light and intermittent beep for correct phase sequence and a red light with continuous beep for reverse sequence. The device is equipped with insulated test clips for secure connection to control panel terminals, ensuring safe and reliable operation.This phase sequence meter supports a wide voltage range from 60V to 600V AC and operates within a frequency range of 20Hz to 400Hz. It is built to withstand impulse voltages up to 4000V, with a dielectric strength of 2000V per minute. Maximum continuous usage is 60 minutes at 60V AC and 4 minutes at 600V AC. Constructed from durable plastic and metal, the tester is compact and lightweight, measuring 85 x 64 x 23mm (3.3 x 2.5 x 0.9 inches) and weighing 120g (4.2 ounces). The package size is 120 x 100 x 50mm (4.7 x 3.9 x 2.0 inches), with a total weight of 200g (7.1 ounces).The package includes: 1 x Phase Indicator.Key Features: - Detects phase sequence and open phase conditions - Wide input voltage range: 60V to 600V AC, three-phase - Clear LED indication with green and red lights - Audible buzzer for phase status alerts - Insulated test leads for safe terminal connection - Portable, compact design for easy transport - Suitable for industrial and electrical maintenance applications