Type 2 surge protection unit DDC50S series

remote signalingfor electrical installationsDC power

Key features

• Type 2 DC surge protector (IEC)
• Model: DDC50S-21Y-1200 · Part No.: 828511563
• Designed for Energy Storage Systems (ESS) and EV charging infrastructure
• Nominal / Max discharge current (In / Imax): 20 kA / 50 kA (8/20 µs)
• Pluggable modules — replaceable spare: MDDC50-1200
• Remote signalling (changeover contact)
• Thermal disconnector with mechanical indicator per pole (Red/Green)
• Compliance: prIEC 61643-41 · IEC 61643-11

Overview
The DDC50S-21Y-1200 is a Type 2 pluggable DC surge protector developed for the transient overvoltage protection of Energy Storage Systems (ESS) and EV chargers. It uses high-energy varistors combined with an internal thermal disconnection mechanism to ensure controlled disconnection at end-of-life and high protection capability. This model is rated for a maximum DC operating voltage of 1200 Vdc. A kit (article code: 1156339601) including the DDC50S-21Y surge protector and a specific high-test fuse (100,000 A tested) is available to secure ESS installations against high short-circuit currents.

Electrical properties

• SPD type: IEC 2
• Nominal DC voltage (Un-dc): 1000 Vdc
• Max. DC operating voltage (Uc): 1200 Vdc
• Residual current (Ipe): < 0.2 mA
• Nominal discharge current (In, 15 × 8/20 µs): 20 kA
• Max. discharge current (Imax, 8/20 µs per pole): 50 kA
• Impulse current by pole (Iimp, 10/350 µs): 4 kA
• Protection level (Up @ In 8/20 µs): 3.6 kV
• Admissible short-circuit current (Isccr): 100 000 A

Mechanical properties

• Connection: Screw terminals 2.5–25 mm² (35 mm² rigid)
• Pluggable module: Yes (3 TE, EN43880)
• Mounting: Symmetrical DIN rail 35 mm (EN 60715)
• Housing: Thermoplastic UL94 V-0
• Operating temperature (Tu): -40 to +85 °C
• Protection rating: IP20
• Disconnection indicator: 1 mechanical indicator per pole (Red/Green)
• Remote signalling: Output on changeover contact · Wiring max 1.5 mm² · Max. 250 V / 0.5 A (AC) · 30 V / 3 A (DC)
• Weight: 0.333 kg

Standards

• prIEC 61643-41
• IEC 61643-11

Thermal disconnector / Back-up

• Thermal disconnector: Internal
• Recommended back-up protection: 50 A min. (for Isccr 100 kA) — 125 A max. (for Isccr 50 kA) · gBat fuses

Technical specifications

• Product reference / model: DDC50S-21Y-1200
• Part Number: 828511563
• Nominal DC voltage (Un-dc): 1000 Vdc
• Max. DC operating voltage (Uc): 1200 Vdc
• Residual current (Ipe): < 0.2 mA
• In (8/20 µs): 20 kA · Imax (8/20 µs): 50 kA
• Iimp (10/350 µs) by pole: 4 kA
• Protection level Up @ In (8/20 µs): 3.6 kV
• Isccr: 100 000 A
• Connection: Screw terminals 2.5–25 mm² (35 mm² rigid)
• Pluggable: Yes — Spare module MDDC50-1200
• Mounting: DIN rail 35 mm (EN 60715)
• Housing: Thermoplastic UL94 V-0 · IP20
• Operating temp: -40 to +85 °C
• Dimensions: 3 TE (EN43880)
• Weight: 0.333 kg
• Intended application: Energy Storage Systems (ESS) / EV Charging
• Protection kit available (article code: 1156339601) including DDC50S-21Y and specific fuse (100,000 A tested)