(Fernsignalisierung), SPD

Wenzhou City POJAL Electric Co.,Ltd.PJD5 seriesSPD is applicable for B,C grade lightning-proof and suitable forTT, IT, TN-S, TN-C-S etc. power supply system of AC50/60Hz, 380V, installed on the joint of LPZ0A zone or LPZ0B and LPZ1 zone, which protects the electric device not shocked by the thunder and lightning. These series usually installed in household distribution boards, computer equipment, information equipment, electronic equipment and in the socket box in front of control equipment or near the control equipment. Remote signalling contact The products can be produced available with the accessory of remote signalling contact. If one or more of modular of the protector is in malfuction, the contact will be closed, and sending the malfunction signal. Main Structure and Operating Principle In three-phase four- line system, three phase lines and one zero line are connected protective device to the earth cable (figure 1). In normal situation, the protective device is high resistance, when the over voltage brings for electric network shocked by thunder or other reasons, the protective device will rapidly transmit in ns, then lead the voltage into earth and protect the electric equipment. As the surge voltage through the protective device and after disappear it will recover to high resistance and not influence the normal operating. Installation: 1. It is installedon standard 35mm rail. 2. The earth cable should choose the double color wire 4mm2 whose length is not longer than 500 mm. 3. To avoid the influence to the electric net after the protector is in malfuction, the protector connected to L line should be in series connect with a fuse. Adjustment, operation, maintenance 1. There's no need to adjust the protector after installation. 2. The protector can automatically protect the electric net should it's installed rightly. 3. When operating, check whether the modular scutcheon is red, at the same time check whether the indication red light is lighting, then can change the malfunction device.