MODEL: MDR2

MDR2 SPECIFICATIONS

ES-8106 Rev.6 Page 1/3

https://www.m-system.co.jp/

Lightning Surge Protectors for

Electronics Equipment M-RESTER

LIGHTNING SURGE PROTECTOR FOR

MULTI-CHANNEL USE

(high discharge current capacity)

Functions & Features

• Protection for semiconductor switches of discrete outputs

against lightning surge damage

• Applicable to both negative and positive common signals

• Applicable to multi analog signals (non-isolation between

channels)

• Space saving with multi-channel protectors

• LED monitor indicating degradation of voltage limiter

• LED monitor driven by discrete I/O signal without auxiliary

power supply

40 [1.57]

160 [6.30]

95 [3.74]

PROTECT

SIDE

MONITOR

1

2

3

4

5

6

7

8

SURGE

SIDE

S1

S2

S3

S4

S5

S6

S7

S8

COM

G

P1

P2

P3

P4

P5

P6

P7

P8

COM

G

mm [inch]

MODEL: MDR2–8[1][2]

ORDERING INFORMATION

• Code number: MDR2-8[1][2]

Specify a code from below for each of [1] and [2].

(e.g. MDR2-8NA)

NUMBER OF PROTECTORS

8: 8 points

[1] COMMON

N: Negative common (NPN)

P: Positive common (PNP)

[2] LEAKAGE CURRENT INDICATOR

Y: None

A: With

GENERAL SPECIFICATIONS

Construction: terminal board; terminal cover provided

Connection: M3.5 screw terminals (torque 1.1 N·m)

Screw terminal: Nickel-plated steel

Housing material: Steel

LED monitor: Red

The leakage current from voltage limiter increases due to its

degradation.

LED becomes brighter gradually in proportion to this

leakage current.

INSTALLATION

Operating temperature: -5 to +55°C (23 to 131°F)

Operating humidity: 30 to 90 %RH (non-condensing)

Mounting: Surface

Weight: 520 g (1.15 lb)

PERFORMANCE

Response time: ≤ 4 nsec

Leakage current @ max. voltage

Line to COM: 5 μA

Line to line: 5 μA

COM to earth: 5 μA

Max. discharge current (Imax)

Line to COM: 10 kA

Line to line: 10 kA

COM to earth: 10 kA

Internal series resistance: 22 Ω ±20 %

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

Max. Continuous operating voltage (Uc)

MDR2

-8NY

-8NA

-8PY

-8PA

Between each of S1 to S8 lines

±30V

Each line to COM*

+30V

-30V

Each line or COM to Earth

±150V

*MDR2 is operational as an SPD despite less than +2V (for

MDR2-8PA) or more than -2V (for MDR2-8NA). However,

the function of the monitor LED is not guaranteed.

Voltage protection level (Up)

• @1kV / 100A (1.2 / 50µs)

MDR2

-8NY

-8NA

-8PY

-8PA

Between each of S1 to S8 lines

±40V

±50V

±40V

±50V

Each line to COM

+40V

+50V

-40V

-50V

Each line or COM to Earth

±500V

• @4kV / 2kA (1.2 / 50µs)

MDR2

-8NY

-8NA

-8PY

-8PA

Between each of S1 to S8 lines

±60V

Each line to COM

+50V

+60V

-50V

-60V

Each line or COM to Earth

±600V