Type 1 + 2 surge arrester DG SE DC 900

type 2DC powerremote signaling

Overview
Protection for low-voltage consumer and DC power installations against lightning-induced surges and switching surges. Suitable for installation according to the lightning protection zone concept at boundaries from 0B – 1 and higher.

Key features

• Universal combined arrester / surge arrester with a base part and plug-in protection module
• Device concept specifically developed for use in d.c. circuits
• Powerful d.c. switching device (DCD) to prevent fire damage from d.c. switching arcs
• Compatible with use without additional backup fuse in defined applications (variant-dependent)
• Operating state / fault indication via green / red indicator in the inspection window
• Tool-free replacement of protection modules thanks to module locking system with release button

Representative variants on this product family (examples)

• DG M DC ACI 1250 FM — Part No. 972150 — Modular surge arrester for d.c. applications; floating remote signalling contact; SPD classification Type 2; Nominal discharge current (8/20 µs): 10 kA; Max. nominal impulse discharge current: 20 kA; Max. SCCR: 5 kA.
• DG ME DC ACI 1250 FM — Part No. 972147 — Combined lightning current and surge arrester for d.c.; combined arrester type 1+2 (Y circuit); Lightning impulse current (10/350 µs): 5 kA; Nominal discharge current (8/20 µs): 12.5 kA; Voltage protection level (DC+ → DC-): < 3.75 kV; Voltage protection level (DC/PE): < 2.5 kV; Max. SCCR: 5 kA.
• DG SE DC 60 — Part No. 972110 — Single-pole modular surge arrester for d.c.; Max. continuous operating voltage DC: 60 V; Nominal discharge current (8/20 µs): 12.5 kA; Voltage protection level: ≤ 0.5 kV; Short-circuit withstand capability without backup fuse (d.c.): 300 A.
• DG SE DC 900 — Part No. 972140 — Single-pole; Max. continuous operating voltage DC: 900 V; Nominal discharge current: 12.5 kA; Voltage protection level: ≤ 3.0 kV; Short-circuit withstand capability without backup fuse (d.c.): 100 A.

Product details & tender text (summary)

• Modular, pluggable surge arresters for DC applications available as combined (ME / ME+SE) and single-pole (SE) types; FM variants include a floating remote signalling contact (changeover contact).
• Designed for DC charging equipment and DC power circuits with variant ratings up to e.g. 1250 V DC, 1000 V DC, 900 V DC, 550 V DC, 242 V DC, 60 V DC.
• Mechanical operating / fault indication and tool-free module replacement facilitate maintenance and inspection.
• Combined ME variants may use leakage-current-free varistor + gas discharge tube (Y circuit) to provide Type 1+2 protection for relevant installations.

Technical characteristics / specifications

• SPD classification: Type 2 (EN / IEC 61643-11 / 61643-41 as applicable per variant)
• Nominal discharge current (I_n) typical: 10 kA or 12.5 kA (8/20 µs) depending on variant
• Max. nominal impulse discharge current (I_max): up to 20 kA (8/20 µs) for some variants
• Lightning impulse current (I_imp) for combined variants: 5 kA (10/350 µs)
• Max. continuous operating voltage (U_C) examples: 60 V DC, 242 V DC, 550 V DC, 900 V DC, 1000 V DC, 1250 V DC (variant-dependent)
• Voltage protection level U_P examples (variant-dependent): ≤ 0.5 kV; ≤ 1.25 kV; ≤ 2.0 kV; ≤ 3.75 kV
• Short-circuit withstand capability (SCCR) examples: 5 kA (some combined variants), 300 A (SE types without backup fuse), 100–300 A depending on variant
• Remote signalling contact: floating changeover contact on FM variants
• DC switching device: DCD included in many variants for safe DC switching and arc suppression
• Modular widths: e.g. 1.5 modules (SE), 4 DIN modules (3-pole combined), 6 DIN modules (selected types)