·Some details are not shown. Please refer to specification sheets for all information.

MD6T-24

Lightning Surge Protectors for
Electronics Equipment M-RESTER

LIGHTNING SURGE PROTECTOR FOR
STANDARD SIGNAL LINE & PULSE USE
(conduit mount, weather-proof, 24 V DC line voltage)

Functions & Features
• Designed specifically for 4 – 20 mA DC and
pulse signal line including both 4-wire and 2-wire transmitters
• Direct mount in a wiring conduit of outdoor enclosures
• Absorbs surges only without affecting instrumentation signal

MODEL: MD6T–24–[1][2][3]

ORDERING INFORMATION
• Code number: MD6T–24–[1][2][3]
Specify a code from below for each [1] through [3].
(e.g. MD6T-24-00B)
For the safety approval code 2 or 4, specify the product’s destination country using Ordering Information Sheet (No. ESU-8284).

[1] SAFETY APPROVAL
0: None
1: FM intrinsically safe
2: CENELEC intrinsic safety (ATEX)
4: CENELEC flameproof (ATEX)
5: FM nonincendive

[2] WIRING CONDUIT
0: G 1/2 (Not selectable for CENELEC flameproof approval)
1: 1/2 NPT
2: M20 × 1.5

[3] BODY MATERIAL
B: Brass
S: Stainless steel

CAUTION
The packing of the cable gland must be separate from the body. Choose an appropriate one for the environment in which the surge protector is used.

GENERAL SPECIFICATIONS
Degree of protection: IP65
Wiring conduit: See ‘Ordering information.’
Connection
  Cable side
: Euro type terminal block (Applicable wire size:
  0.14 – 1.5 mm2 (AWG26 – 16) for both stranded and solid
  wires; stripped length: 6 mm)
  Equipment side: Leadwires (leadwire diameter AWG20 for grounding; AWG22 for the protected equipment)
Body material: Nickel-plated brass or stainless steel 316

INSTALLATION
Operating temperature: -40 to +85°C (-40 to +185°F)
(See Safety Parameters for use in a hazardous
location.)

Mounting: Screwed into an electrical conduit of outdoor enclosures
Weight: 500 g (1.1 lb)

PERFORMANCE
Discharge voltage (peak voltage) 
  Line to line: 30 V min. 
  Line to ground: ±160 V min.
Max. surge voltage
  Line to line: 40 V max. 
  Line to ground: ±650 V max.
(The maximum voltage that could pass through the surge protector. Protected equipment must be able to withstand this voltage for a very short time period.)
Response time:
 Line to line: ≤ 4 nsec.
 Line to ground: ≤ 20 nsec.
Leakage current:
  Line to line: ≤ 5 μA @ 30 V DC
  Line to ground: ≤ 5 μA @ ±160 V DC
Discharge current capacity: 10000 A (8/ 20 μsec.)
Max. load current: 100 mA
Internal series resistance: Approx. 22 Ω including return
Max. line voltage 
  Without safety approval: 30 V DC
  With safety approval: 28 V DC
Capacitance @ 1 kHz:
 Line to line:  ≤ 2500 pF
 Line to ground: ≤ 100 pF

STANDARDS & APPROVALS
EU conformity:
ATEX Directive
  EEx ia EN 50020
  Ex d EN 60079-1
EMC Directive 
  EMI EN 61000-6-4
  EMS EN 61000-6-2
RoHS Directive
  EN 50581
Safety approval:
FM: Intrinsically safe
Class I, Div. 1, Groups A, B, C and D
Class II, Div. 1, Groups E, F and G
Class III, Div. 1
Class I, Zone 0, AEx ia IIC
T5 and T6
(Class 3610, ANSI/ISA 60079-11)
FM: Nonincendive
  Class I, Div. 2, Groups A, B, C, and D
  Class II, Div. 2, Groups E, F and G
  Class III, Div. 1
  T6
  (Class 3611)

SAFETY PARAMETERS
Operating temperature:
  T5 -40 to +80°C
  T6 -40 to +70°C
    -40 to +75°C for CENELEC (ATEX) flameproof
    -40 to +80°C for FM nonincendive
Ex-data:
  Ui (Vmax) 30 V ('Any' for CENELEC intrinsic safety approval (ATEX))
  Ii (Imax) 100 mA ('Any' for CENELEC intrinsic safety approval (ATEX))
  Pi 750 mW
  Ci 2.5 nF
  Li 0 mH

CONNECTION EXAMPLES

EXTERNAL DIMENSIONS unit: mm (inch)

SCHEMATIC CIRCUITRY & CONNECTION DIAGRAM

M-System Co., Ltd.