The SZW26-20/YH5.3 is a three-phase voltage conversion and measurement switch. This product is a seven-position, three-section switch with a neutral position, supporting voltage measurement switching in three-phase four-wire systems (including the neutral wire). It has a rated current of 20A and is suitable for AC 50/60Hz circuits with a rated voltage of ≤440V and an insulation voltage of 690V.
Core Functions and Features:
Seven-position measurement: Through the position selection (TR-ST-RS-0-RN-SN-TN), it can sequentially measure the three-phase line voltages (e.g., Urs, Ust, Utr) and the phase voltages to the neutral line (e.g., Urn, Usn, Utn), enabling comprehensive system voltage monitoring.
Structural design: Features a flame-retardant casing, silver alloy contacts, and thickened copper conductors to ensure stable and safe measurement pathways.
Technical Parameters:
Mechanical life: ≥10⁵ cycles
Electrical life: ≥3×10⁴ cycles (operating frequency 120 times/hour)
Operating environment: Temperature -25℃~+40℃, altitude ≤2000m
Main Application Scenarios:
Specifically designed for distribution cabinets, control boxes, power monitoring systems, and other applications, providing safe and convenient switching and measurement of line voltage and phase voltage in three-phase AC systems. It is an ideal tool for equipment debugging, system monitoring, and maintenance diagnostics.
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