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DC power surge protector

Part Number 828511363
  • 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
Nominal DC voltage
Un-dc 650 Vdc
Max. DC operating voltage
Uc 800 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 2.7 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
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)
See diagram - 3 TE (EN43880)
Standards compliance
prIEC 61443-41 - IEC61643-11
Thermal disconnector
Back-up protection device
50 A min. (Isccr 100 kA) - 125 A max. (Isccr 50 kA) - gBat Fuses