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AC SPD T1+T2 255V 25ka 1p+N Surge Protector for Single Phase Wholesale. Type 1 + Type 2 Protection: Class I and Class II surge protection for single-phase TT/TN systems. Visual Fault Indication: Green window turns red upon fault; includes optional remote alarm terminal. Advanced GDT Technology: Hermetical High Energy Gas Discharge Tube with high follow current extinguishing. Dual Thermal Disconnection: Double thermal devices provide enhanced reliability and safety. Flexible Customization: Offers full, minor, and flexible customization from samples or designs.