MODEL: MD7ST

MD7ST SPECIFICATIONS

ES-8057 Rev.10 Page 5/6

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

SCHEMATIC CIRCUITRY

SHIELD TERMINAL

MODEL NO.

SCHEMATIC CIRCUITRY

APPLICATIONS

5

–

+

+

2

6

3

7

8

DISCHARGE

ELEMENT

DISCHARGE

ELEMENT

4

1

Series Resistance

(SHLD)

Surge Side

Protected Side

Fuse/Disconnect

DIN RAIL ADAPTOR

(for grounding)

DIN RAIL

Grounding

• Line to SHLD:

Floating

• Earth to SHLD:

Floating

• MD7ST-xFF0x

(No fuse option)

• MD7ST-xFF1x

(Fuse option)

• Standard type

• To protect a device having

isolation between Signal

and Earth.

• When SHLD should be

floating against the earth.

(single-end grounding)

• Line to SHLD:

Floating

• Earth to SHLD:

Grounding

• MD7ST-xFG0x

(No fuse option)

• MD7ST-xFG1x

(Fuse option)

• To protect a device having

isolation between Signal

and Earth.

• When SHLD should be

grounded. (single- or both-

end grounding)

• Line to SHLD:

Grounding

• Earth to SHLD:

Floating

• MD7ST-xGF0x

(No fuse option)

• MD7ST-xGF1x

(Fuse option)

• To protect a device having

isolation between Signal

and Earth.

• When SHLD wire should be

connected to SG terminal

of the protected device.

(SHLD is not grounded to

the earth.)

• Line to SHLD:

Grounding

• Earth to SHLD:

Grounding

Sections enclosed with broken line may differ depending upon the models; without Fuse/Disconnect option, fuse circuit is shorted.

• MD7ST-xGG0x

(No fuse option)

• MD7ST-xGG1x

(Fuse option)

• To protect a device which

does not have a good

dielectric strength between

Signal and Earth.

5

–

+

–

+

2

6

3

7

8

DISCHARGE

ELEMENT

4

1

Series Resistance

(SHLD)

Surge Side

Protected Side

DIN RAIL ADAPTOR

(for grounding)

DIN RAIL

Grounding

Fuse/Disconnect

5

–

+

–

+

2

6

3

7

8

DISCHARGE

ELEMENT

DISCHARGE

ELEMENT

4

1

Series Resistance

(SHLD)

Surge Side

Protected Side

DIN RAIL ADAPTOR

(for grounding)

DIN RAIL

Grounding

Fuse/Disconnect

5

–

+

–

+

2

6

3

7

8

DISCHARGE

ELEMENT

4

1

Series Resistance

(SHLD)

Surge Side

Protected Side

Fuse/Disconnect

DIN RAIL ADAPTOR

(for grounding)

DIN RAIL

Grounding