Dc systems measure from positive and negative input. Out load as shown in fig.

Wiring A Ct 660b9 And A Thr 74 Throttle
Dc spd connection diagram. Apply voltage to spd. It is characterized by its capacity to safely discharge current with 820 µs wave form. Dc spd for solar dcdb. Solar spd for gridtie inverters. Never coil or push aside excess length. Confirm that the spd is correctly rated for the system to which it is to be connected to.
Solar type 2 spd. 600vdc spd for solar power plants. This device is connected in parallel on the power supply circuit of the loads that it has to protect see fig. 12 dc connect the red wire to pv and the black wire to pv or battery minus. Measure l n l g l l and n g of the ac system. Ovr type 2 and type 23 are designed to protect electric installations and sensitive equipment against indirect surges with ensuring a low protection level up.
Rooftop solar dc spd. J17it can also be used at all levels of the power supply network. Connection leads should be cut to minimum possible length. China surge protector device surge arrester spd surge protection dc1000v dc 500v find details about china surge protector device dc spd from surge protector device surge arrester spd surge protection dc1000v dc 500v xinchi electric co ltd. Pv combiners get installed as shown in figure 11 5. Both leds in the spd should glow blue as a sign that voltage is present in system spd is connected correctly and working and the system is protected.
The surge protection device spd is a component of the electrical installation protection system. Dc spd for ongrid inverter.