M-System MD7ST Data Sheet

MODEL: MD7ST

http://www.m-system.co.jp/ MD7ST SPECIFICATIONS ES-8057 Rev.6 Page 1/6

Lightning Surge Protectors for

7 (.28)

95

(3.74)

98

(3.86)

mm (inch)

Electronics Equipment M-RESTER

LIGHTNING SURGE PROTECTOR FOR STANDARD SIGNAL LINE

(ultra-slim)
Functions & Features

• High discharge current capacity 20 kA (8 / 20μs), 1 kA (10
/ 350 μs)

• Ultra-thin 7-mm-wide module can be mounted
in high density

• Excellent protection employing multi-stage SPD circuits

• DIN rail mounting and grounding

• Shield terminal provided

• CE marking

[3] LOOP DISCONNECT FUSE

0: Without
1: With (CENELEC/ATEX approval Not selectable)

[4] SAFETY APPROVAL

0: None
2: CENELEC intrinsic safety (ATEX)

RELATED PRODUCTS

• Loop disconnect fuse (model: MD7F)

GENERAL SPECIFICATIONS

Construction: Slim-sized front terminal structure
Degree of protection: IP20
Connection: Euro terminal block (torque 0.3 N·m)
Applicable wire size: 0.2 – 2.5 mm
Grounding: DIN Rail
Housing material: Flame-resistant resin (black)
Loop disconnect fuse: Current rating 250 mA
(Separates the protected device from the power source
when the former fails in the shortcircuit mode.)

2

MODEL: MD7ST–[1][2][3][4]

ORDERING INFORMATION

• Code number: MD7ST-[1][2][3][4]
Specify a code from below for each [1] through [4].
(e.g. MD7ST-24FF00)
For the safety approval code 2, specify the product’s
destination country using Ordering Information Sheet (No.
ESU-8057).

[1] NOMINAL VOLTAGE

24: 24 V DC
60: 60 V DC

[2] SHIELD TERMINAL (line / earth)

FF: Floating / Floating
FG: Floating / Grounding
GF: Grounding / Floating
GG: Grounding / Grounding

INSTALLATION

Operating temperature: -25 to +85°C (-13 to +185°F)
(See Safety Parameters for use in a hazardous location.)
Operating humidity: 30 to 90 %RH (non-condensing)
Mounting: DIN Rail (TH35-7.5, 1-mm-thick)
Oxide film on the surface of an aluminium rail may lower
the electric conductivity between this module and the
ground. Use a steel or copper rail.
Weight: 70 g (2.5 oz)

MODEL: MD7ST

http://www.m-system.co.jp/ MD7ST SPECIFICATIONS ES-8057 Rev.6 Page 2/6

PERFORMANCE

MODEL NO.

NOMINAL VOLTAGE

MD7ST-24 MD7ST-60

SHLD TERMINAL

FF FG GF GG FF FG GF GG

Max. continuous Line to Line 30V 70V
operating voltage

Line to Earth ±160V 30V ±160V 70V

(Uc)

Line to SHLD ±160V 30V ±160V 70V
SHLD to Earth ±160V short ±160V short ±160V short ±160V short
Voltage protection Line to Line 60V 115V

level (Up)

Line to Earth ±800V

±60V

±800V

±115V

@4kV (1.2 / 50 µs)

Line to SHLD

±1200V

±800V

±60V

±1200V

±800V

±115V

SHLD to Earth

±800V

short

±800V

short

±800V

short

±800V

short

Leakage current Line to Line ≤5µA ≤5µA
@Uc

Other sections ≤5µA ≤5µA
Response time Line to Line ≤4 nsec. ≤4 nsec.
Other sections ≤20 nsec. ≤20 nsec.
Max. discharge current (Imax) 20kA (8 / 20 µs), 1.0kA (10 / 350 µs)
Nominal current (I

N) 250mA

Internal series Without fuse 4.7Ω ±10% per line 10Ω ±10% per line
resistance

With fuse 7.5Ω ±10% per line 12.5Ω ±10% per line

CENELEC: Intrinsic safety (ATEX)

II 1G, Ex ia IIC; T4 and T5
EN 60079-0: 2006
EN 60079-11: 2007
EN 60079-26: 2007

■ CENELEC / ATEX IS DATA

MD7ST-24 MD7ST-60

Ui (Vmax)

32V 60V

Ii (Imax)

any any

Ci

10 nF 5 nF

Li

0 µH 0 µH

Pi

Temp. Class Range Parameter

T4

-25 to +40°C 1.3W

-25 to +60°C 1.2W

-25 to +80°C 1.0W

T5 -25 to +40°C 1.0W

STANDARDS & APPROVALS

CE conformity:
ATEX Directive (94/9/EC)
Ex ia EN 60079-11: 2007
Category 1G EN 60079-26: 2007
EMC Directive (2004/108/EC)
EMI EN 61000-6-4: 2007
EMS EN 61000-6-2: 2005
Safety approval:

Surge protection: IEC 61643-21: 2000
(Categories C1, C2, D1)

SAFETY PARAMETERS