Data and telecommunication line surge protection unit MDL-28-R

for lightingcompactgas discharge tube

Overview
MDL compact surge protective devices (SPDs) are designed to protect the DALI control-lines of lighting systems, typically used in tunnel applications, from lightning and transient overvoltages. The MDL-28-R (Part Number: 831611) is a compact non-pluggable (monobloc) unit intended for mounting on plates inside luminaires or lighting cabinets. The hybrid protection circuit combines a gas discharge tube (GDT) and clamping (TVS) diodes to provide full-mode protection across the data pair and optional protection for the signalling ground conductor.

Key features

• Protection for 1-pair (2-wire) data lines (DALI)
• High-energy common-mode protection
• Low clamping level in differential mode
• Galvanic isolation of earth connection where required
• Indoor use, IP20 (NEMA 2)
• Plastic enclosure, UL94-V0
• Certified to IEC/EN 61643-21
• Recommended installation zones and test categories: LPZ 1–3, C2/C3

Available documents

• Datasheet
• CITEL_Certif_KEMA_MDL-28-R.pdf
• CITEL_Certif_CB_MDL-28-R.pdf
• Installation Sheet
• Tender specifications

Technical specifications

• Network: Digital communication (2-Wire)
• Protection modes: CM / DM
• Lightning Protection Zones (LPZ): 1 - 3
• Nominal line voltage (Un): 24 Vdc
• Max. DC operating voltage (Uc): 28 Vdc
• Cut-off frequency (-3 dB, 100 ohm system) f max.: > 30 MHz
• Cut-off frequency (-1 dB, 100 ohm system) f max.: > 10 MHz
• Max. load current @25°C (IL): 500 mA
• Signal rise/fall times (to BS EN IEC 62386-101:2022): 3 µs
• Nominal discharge current In (C2 - 1.2/50µs / 8/20µs), 10 applications X-C (Line/Earth): 4 kV / 2 kA
• Nominal discharge current In (CWG with 42 ohms, X-X Line-Line, to IEC 61000-4-5): 800 V / 20 A
• Max. discharge current (C2, 10 applications, X-C Line-Earth): 20 kV / 10 kA
• Protection Level Up (C3, 10/1000µs, 300 applications @10 A, Y-Y Line/Line): < 40 V
• Protection Level Up (C2, 1.2/50µs / 8/20µs, 10 applications, Y-C Line-Earth): < 1000 V
• Protection Level Up (CWG with 42 ohms, Y-Y Line-Line, to IEC 61000-4-5): < 48 V
• Line resistance (±10%): < 0.2 ohms
• Capacitance @1 MHz X-C (Line/Earth): < 10 pF
• Capacitance @1 MHz X-X (Line-Line): < 30 pF
• Technology: GDT + TVS diode (hybrid)
• SPD configuration: Data-pair plus PE
• Connection to network: 2 spring terminals opposite side in/out - wire up to 1.5 mm²
• Format: Plastic enclosure with input/output connectors
• Mounting: On plate
• Housing material: Thermoplastic UL94 V-0
• Operating and storage temperature: -40 / +85 °C
• Ingress Protection rating: IP20 (NEMA 2)
• Failsafe mode: Transmission cut-off - Fault mode 2 (short-circuit)
• Dimensions: See diagram
• Weight: 0.035 kg / 0.09 lbs
• Standards compliance: IEC 61643-21 / EN 61643-21 / IEC 61000-4-5 / IEC 62386-101
• Certification: KEMA, EAC
• Reference / Model: MDL-28-R
• Part Number: 831611