S u r g e P r o t e c t i o n D e v i c e s

S D S e r i e s

4

Analog outputs

Controller outputs (I/P converters)

Dependent on the working voltage, recommendations

include the SD16, SD32 and SD55, and the equivalent

‘X’ versions.

Digital (on/off) inputs - Switches

Suitable signal protection devices include the SD07, SD16,

SD32 and SD55 modules, and the equivalent “X” versions.

The choice is dependent upon the operating voltage of the

system.

Digital (on/off) outputs -

Alarms, LEDs, solenoid valves, etc.

The SD32 or SD32X are the recommended choice for this

application.

Telemetry Public Switch Telephone Network

(PSTN) - Telemetry outstations

The SDPSTN has been designed specifically for the

protection of signals transmitted on public switched

telephone networks.

AC supplied equipment - PLC, I/O systems

The recommended choice or systems on 110-120V ac is

the SD150X ; for 220-240V ac systems, the SD275X is

recommended.

FIELD CIRCUIT

PROTECTED CIRCUIT

Controller outputs

(I/P converters)

Switches

Alarms, LEDs, solenoid

values, etc.

Telecom line

PLC, I/O systems

4

5

63

1

SD16

SD32

SD35

SD16

SD32X

SD55X

(no fuse)

2xSD15X, SD32X

P

I

V

OV

2

4

5

63

1

SD07

SD16

SD32

SD55

SD07X

SD16X

SD32X

SD55X

(no fuse)

SD

V

OV

Logic Signal

2

4

5

63

1

32V max

SD32

SD32X

(no fuse)

LED

Alarm

SD32X

2

4

5

6

1

PLC,

DCS,

SCADA,

etc.

Final output from

110/120V ac

or

220/240V ac

2

3

4

5

6

1

Modem,

fax or

telephone

Incoming

Telephone

Line

2

3