DC power surge protector

Part Number 828511253
  • DC power Type 2 SPD
  • For Energy Storage/EV Charging
  • In/Imax: 20/50 kA
  • Pluggable modules
  • Remote signaling (option)
  • prIEC 61643-41 compliance

The DDC50-21Y 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 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 the ESS installation, CITEL has developed a kit (article code: 1156339601) of products consisting of a DDC50-21Y surge protector and a specific fuse (100,000 A tested and approved) compatible with: short-circuits of storage systems and CITEL surge protectors.

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SPD type
Nominal DC voltage
Un-dc 450 Vdc
Max. DC operating voltage
Uc 500 Vdc
Residual Current
Leakage current to Ground
Ipe < 0.1 mA
Nominal discharge current
15 x 8/20 µs impulses
In 20 kA
Max. discharge current
max. withstand @ 8/20 µs by pole
Imax 50 kA
Impulse current by pole
max. withstand 10/350µs by pole
Iimp 4 kA
Protection level +/-
@ In (8/20µs)
Up 2.1 kV
Protection level +/PE (-/PE)
@ In (8/20µs)
Up 2.1 kV
Admissible short-circuit current
Isccr 100 000 A
Connection to Network
By screw terminals: 2.5-25mm²
Symmetrical rail 35 mm (EN 60715)
Housing material
Thermoplastic UL94 V-0
Operating temperature
Tu -40/+85°C
Protection rating
Failsafe mode
Disconnection from DC network
Disconnection indicator
1 mechanical indicator by pole - Red/Green
Spare module(s)
Remote signaling of disconnection
option DDC50S-21Y-500: output on changeover contact
See diagram - 3 TE (EN43880)
0.292 kg
Standards compliance
prIEC 61443-41 - IEC61643-11
Thermal disconnector
Back-up protection device
Fuse assembly: SFD50S-10-1500DC /or 50 A min. (Isccr 100 kA) - 125 A max. (Isccr 50 kA) - gBat Fuses