Automatic electric offersmanufactures phase sequence indicators. [model psi-96m is one of the model of this sequence indicator.] that psi-96m isare rotating disc type instruments. Electrical specifications of these indicators include: electromechanical type, 50 v to 500 v ac operating voltage, 25 hz to 60 hz frequency, greater than 20 m ohms at 500 v dc insulation resistance, dielectric strength of 2 kv rms for one minute, -10ºc to 55ºc operating temperature, -20ºc to 70ºc storage temperature, humidity up to 95 per cent rh, etc. Mechanical specifications are size of 96 mm x 96 mm x 56 mm, weight of 600 grams approximately. Constructional features they have: the disc rotates in clockwise direction when correctly connected to incoming three-phase power supply. Back arrow on white disc indicates correct phase sequence. If rotation is anti-clockwise then it indicates that one of the phases is reversed.S these phase sequence indicators are suitable ffor use only in horizontal position, this phase sequence indicator is best suited and should not be left in circuit. Three, 1 metre long red, yellow, blue colour slids with clips and sheaths are provided.
