ERICO DSD120 User Manual

DIN SURGE DIVERTER

17,5

INSTALLATION INSTRUCTIONS

PRODUCT SERIES

DSD120 Series

90

1. PREPARATION

DANGER: Possible electrical shock or burn

hazard. Qualified personnel should only install this

product. Failure to lockout electrical power during
installation or maintenance can result in fatal electrocution or
severe burns. Before making any connections to this
electrical panel please ensure that power has been removed
from all associated wiring, electrical panels, and other
electrical equipment.

CAUTION NOTES:

1. The installation of this DIN Surge Diverter (DSD) should

follow observe nationally recognized codes of authorities
having jurisdiction to ensure correct and safe operation.

2. Check to ensure that the maximum continuous operating

voltage Uc of the DSD selected is higher than that
expected on the circuit being protected.

3. It is important to ensure that the maximum line current

rating IL of the DSD is not exceeded.

4. The ground (earth) terminal must be connected to a low

impedance earth (<10 ohms) for correct operation.

5. Do not perform a “Flash Test” or use a Megger to test

circuits that are protected with these DSD units. This may
damage the DSD(s) and affect the insulation readings
being performed.

6. Do not attempt to open or tamper with the DSD unit in any

way as this may compromise performance and will void
warranty.

2. INTRODUCTION

The CRITEC DSD120 series of low voltage DIN Surge
Diverters has been designed to protect equipment from the
damaging effects of surges on low voltage data, control and
signaling lines. It is also ideal for the protection of DC power
supply lines.

3. ELECTRICAL CONNECTION

Please follow the sequence indicated:

1. First, ensure that power is removed from the area and the
circuits to be connected.

2. Connect line side wiring to the DSD screw terminals

marked LINE (0V, +V). The “line side” of the DSD is the
“exposed side” where the surge is expected to originate.

3. Connect equipment side wiring to the DSD screw

terminals marked EQUIP (OV’, +V’). The “equipment side”
of the DSD is the protected side and wires to the equipment
being protected.

4.The DSD should be installed as close to the equipment

being protected as possible. Where protecting long cable
runs (< 30 meters), a DSD unit should be installed at either
end of the cable.

5. Connect the DSD ground terminal to a low impedance

ground using as direct a path as possible. When the DSD
is installed on a DIN rail, grounding of the unit can be
achieved by connecting the rail to ground.

Table 1. DSD120 operating specifications

Model DSD 120-1S-12 DSD120-1S-24
Nominal System Voltage Un 12V-- 24V--

Max. Cont. Operating Voltage Uc 15V-- 28V-­Max. Line Current IL 10A

Imax 20kA 8/20µs
Dimensions 90mm x 68mm x 17.5mm

Connection =6 mm2 (#18 to #10 AWG)
Mounting 35mm top hat DIN rail
Temperature -25 to +70°C (-13 to +158°F)

 2003 ERICO Inc, 34600 Solon Rd, Solon, OH 44139 Phone [phone] Fax [phone] Page 1 of 1