The ZGGH15-24 Modular Power Supply SPD consists of a ZGGH15-24MK power supply module and a ZGGH20-DZ1 base, used for secondary and tertiary protection of the DC system + -- - and - -- PE. It is connected between DC power supply and system equipment in series or in parallel. It can prevent equipment from the impulse surge and transient overvoltage caused by the outside environment (such as lightning, EMI, etc.) or by the system (such as switching effects of the system, startup or shutoff of the inductance and capacitance load, etc.).