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DC power surge protector

DDC50S-21Y-500
Part Number: 828511263
DDC50S-21Y-500
  • DC power Type 2 SPD
  • For Energy Storage/EV Charging
  • In/Imax: 20/50 kA
  • Pluggable modules
  • Remote signaling
  • prIEC 61643-41 compliance

The DDC50S-21Y range is type 2 pluggable surge protectors designed for protection to Energy System Storage (ESS). Its technology based on high energy varistor equipped with thermal disconnection mechanism offers protection efficiency and a maximal reliability. These DC power surge protectors are available with a Max. DC operating voltage from 500 to 1500 Vdc. To ensure maximum protection of installation, CITEL has developed a fuse dedicated to ESS (compatible with short circuit currents up to 100,000 A). This fuse (ref: SFD50S-10-1500DC), specifically created for a combination with a surge protection, is installed upstream of the DDC50-21Y protectors.


SPD type 2
Nominal DC voltage Un-dc 450 Vdc
Max. DC operating voltage Uc 500 Vdc
Residual Current Ipe < 0.1 mA
Nominal discharge current In 20 kA
Max. discharge current Imax 50 kA
Impulse current by pole Iimp 4 kA
Protection level +/- Up 2.1 kV
Protection level +/PE (-/PE) Up 2.1 kV
Admissible short-circuit current Isccr 100 000 A
Network type DC
Connection to Network By screw terminals: 2.5-25mm²
Plugable Yes
Mounting Symmetrical rail 35 mm (EN 60715)
Housing material Thermoplastic UL94 V-0
Operating temperature Tu -40/+85°C
Protection rating IP20
Failsafe mode Disconnection from DC network
Disconnection indicator 1 mechanical indicator by pole - Red/Green
Spare module(s) MDDC50-500
Remote signaling of disconnection output on changeover contact
Wiring for remote signaling 1.5 mm² max.
Max. Voltage/Current for remote signaling 250 V / 0.5 A (AC) / 30 V / 3 A (DC)
Dimensions See diagram - 3 TE (EN43880)
Weight 0.296 kg
Standards compliance prIEC 61443-41 - IEC61643-11
Thermal disconnector Internal
Fuses 50 A min. (Isccr 100 kA) - 125 A max. (Isccr 50 kA) - gBat Fuses