... 1P,2P,3P,4P Low voltage power surge protective device 1. Description: surge protection device (SPD, surge protector, surge arrester) is suitable for TT, ... means abnormal, it also could be replaced when operation. 2. Certificate:3. Company introduction:1.We are professional manufacture ... disconnector & changeover switch etc. for more than 20 years.2.Provide OEM, ODM service, owning ourself mould shop , ...