Feature 1 Reasonable structure, small size, beautiful appearance, equipped with protective cover, power supply is more safe and reliable. 2 Complete protection function, short circuit, overload, lack of phase, undervoltage protection. 3 With EPS fire power supply interface, DC12-24V can reliably long distance double point. 4 Noiseless operation, energy saving, easy installation, simple operation and reliable performance. 5 Especially suitable for office buildings requiring fire fighting. Features: Reasonable structure, small size, beautiful appearance, equipped with protective cover, power supply is more safe and reliable. Complete protection function, short circuit, overload, lack of phase, undervoltage protection. With EPS fire power supply interface, DC12-24V can reliably long distance double point. Noiseless operation, energy saving, easy installation, simple operation and reliable performance. Especially suitable for office buildings requiring fire fighting. Specifications: Model: ZGQ1M - 63/4P Insulation voltage: 4000 (V) Input voltage: 400V Rated voltage: 400 (V) EPS external indication: DC12-24V Rated current: 63 (A) Rated impact withstand voltage: 4 (KV) 3C rated voltage range: 37V-440V Size: 21.5 x 13.5cm / 8.5 x 5.3in Weight: 1685g Wiring diagram: Package included: 1 x Automatic Transfer Switch