Surge Protection Device 3P 40KA 420V Voltage Protection Safety Limiter Function: 1. Quick response: Under normal conditions, the protector is in a high resistance state. When the power grid supports an overvoltage surge due to lightning strike or other reasons, the surge protector will be turned on quickly in nanoseconds, introducing the overvoltage surge to the ground, thus protecting the electrical equipment on the power grid.2. Stable operation: when the surge voltage passes through the protector and disappears, the protector will change back to the high resistance state so as not to affect the normal operation of the power grid.3. Surge protection: mainly used to limit the amplitude of transient overvoltage, absorption, consumption or discharge of surge current, so that the protected electrical components can be converted from overvoltage to another lower overvoltage in case of higher overvoltage.4. Wide Application: Suitable for protecting household and similar electrical appliances against induced lightning overvoltage and switching overvoltage.5. Easy to install: Compact size and light weight, the surge protector supports 35mm electrical bus installation, which can be completed in minutes. Specification: Item type: Surge protection device Material: Fireproof PC. Installation: 35mm electrical rail. Uc: ~ 420VImax: 40KAW: 20KAUp: le; 2.0 kv Working ambient temperature -40 ~ +80 Package list: 1 x Surge protection device How to use: 1. The connecting wire should be a wire with the same capacity as or larger than the power line, and the total length should be controlled within 0.5m. The shorter the wire length, the better.2. A suitable air switch or fuse must be connected in series at the front end of the surge protector.3. Power must be disconnected during installation.4. Judgment of SPD error:A. The module indicator window is green, which means normal. When the indicator window turns red after the module has deteriorated, it should be replaced in time.B. The surge protector can be equipped with a remote FS signaling alarm. The remote signal contact has one normally open and one normally closed contact. If one or more surge protection modules fail, the contact will close and send a fault alarm signal, indicating that the module must be replaced in the event of failure. Frequently check the air switch or fuse in series with the circuit.