Citel DS440-400 SPD, compact, type, 3-phase, type 2, 400VAC, 20kAProduct Overview The DS440 400 is a compact Type 2 AC surge protector designed to protect 3 phase+Neutral networks at the main switchboard level in 230 400V applications. This modular SPD features high energy metal oxide varistor (MOV) technology with integrated thermal disconnectors and failure indicators, providing common mode protection with pluggable modules and a fixed base for easy and fast maintenance in industrial and commercial electrical