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1-pair Data surge protector

Part Number: 831611
MDL-28-R
MDL-28-R
MDL-28-R
MDL-28-R
MDL-28-R
  • Data line protection
  • High energy protection in common-mode
  • Low clamping level in differential mode
  • Galvanic isolation to earth connection
  • Indoor applications, IP20 (NEMA 2)
  • Plastic enclosure, UL94-V0
  • Certified acc. to IEC/EN 61643-21
  • Location and test categories: C2, C3
MDL compact surge protective devices (SPDs) are designed to protect the DALI control-lines of lighting systems, typically used in tunnel applications, from the effects of lightning and transient over voltages. These SPDs are installed on mounting plates, typically within the luminaires itself or in the lighting cabinets. MDL SPDs protect 1-pair (2-wire) lines and feature a compact non-pluggable (monobloc) enclosure based on Citels' well-known MLPC series shape. The hybrid protection circuit combining a gas discharge tube and clamping diodes offers a full-mode protection across the data-lines by additionally providing specific protection for the signalling ground wire (where needed).
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MDL-28-R

Network

Digital communication (2-Wire)
Protection modes (network)

CM / DM
Lightning Protection Zones (LPZ)

1 - 3
Nominal line voltage
 Un

24 Vdc
Max. DC operating voltage
 Uc

28 Vdc
Cut-off frequency
-3dB, 100 ohm system
 f max.

> 30 MHz
Cut-off frequency
-1dB, 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
 tʳⁱˢᵉ, tᶠᵃˡˡ

3 µs
Nominal discharge current
C2 (1.2/50us / 8/20µs), 10 applications X-C (Line/Earth)
 In

4 kV / 2 kA
Nominal discharge current
CWG (1.2/50us / 8/20us) with 42 ohms, X-X (Line-Line), to IEC 61000-4-5 (unshielded asymmetric)
 In

800 V / 20 A
Max. discharge current
C2 (1.2/50µs / 8/20µs), 10 applications, X-C (Line-Earth)

20 kV / 10kA
Protection Level
C3 (10/1000μs), 300 applications@10 A, Y-Y (Line/Line)
 Up

< 40 V
Protection Level
C2 (1.2/50µs / 8/20µs), 10 applications, Y-C (Line-Earth)
 Up

< 1000 V
Protection Level
CWG (1.2/50µs / 8/20µs) with 42 ohms, Y-Y (Line-Line), to IEC 61000-4-5 (unshielded asymmetric)
 Up

< 48 V
Line resistance (± 10%)

< 0.2 ohms
Capacitance
@1MHz X-C (Line/Earth)
 C

< 10 pF
Capacitance
@1MHz X-X (Line-Line)
 C

< 30 pF

Technology

GDT+TVS diode
SPD configuration

Data-pair, plus PE
Connection to Network

2 spring terminals opposite side in/out - wire 1.5mm² max.
Format

Plastic Enclosure with connectors input/output
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