1、[Built in Circuit Breaker] This PV combiner box has built in DC500V 32A 2P circuit breaker, which adopts flame retardant shell, silver contact, and copper coil, ensuring excellent performance. 2、[Surge Protection] Equipped with DC500V 20 to 40kA 2P surge protector, which utilizes standard lightning protection chips instead of varistors, providing a safe and reliable surge protection. 3、[Safe and User Friendly] The combiner box is made of PC flame retardant housing, with IP65 waterproof and dustproof protection, UV resistant, designed with a transparent observation window for easy inspection. 4、[2 Installation Methods] The combiner box can be easily connected to the solar panel using solar connectors for faster and safer installation, or it can be directly wired using waterproof connectors and terminals. 5、[Wide Applications] Suitable for both grid connected and off grid photovoltaic solar panel systems, solar power systems, photovoltaic arrays, and RV solar systems.