1、2 Operation Modes: This dual power transfer switch supports manual and automatic operation, fast switching without power outage, easy maintenance, and is widely used in situations where continuous power outages are not allowed. 2、Main Function: Mainly used to test whether the main or backup power supply is normal. When there is an abnormality in the main power supply, the backup power supply will work immediately to ensure continuity, reliability, and safety. 3、35mm Rail Mount: This 4P power changeover switch has a compact structure, which is easy to install and maintain, and using 35mm standard rail installation, specifically designed for PZ30 distribution box. 4、Applicable Fields: This dual power changeover switch is suitable for emergency power supply system with 50/60Hz AC rated , and suitable for places such as factories, shopping malls, and seedling farms. 5、Durable Materials: The changeover switch is made of PC flame retardant plastic with good insulation, high temperature resistance and aging resistance, the silver contact with terminal protection cover can improve the conductivity and service life. Item Type: Dual Power Automatic Transfer Switch Model: NLQ5-100/4P Material: PC Flame Retardant, Silver Grade: PC Class Specification: 4P Life: Electrical: 2000 Times; Mechanical: 5000 Tmes Rated Short Circuit Current: 50kA Fuse: RT16-00-63A Auxiliary Circuit: 2 relays, each with 2 sets of contacts capacity: AC220V 50Hz le=5y Touch Time: <50ms Switching Time: <50ms Return Time: <50ms Closing Time: <50ms Size: Approx. 143 x 96 x 69mm / 5.6 x 3.8 x 2.7in 1 x Dual Power Transfer Switch 2 x Protective Covers 1 x Accessory 1 x User Manual