DT320 … / DT321 …Over-voltage protector

Categories: Cabinet, Cabinet / Overvoltage protectors, Overvoltage protectors

Product features

Transient voltage protection of 4-20 mA current loops
3-stage protection
10 kA surge (8 / 20 μs) withstand capability
41 V max. output voltage
TS-35 rail mounting, 25 mm width
IP 65 enclosure versions

Type designation

Product description

The DT320 … / DT321 … Over-voltage protectors are designed to protect the 4-20 mA transmitter loop against over-voltage.
The units use 3 stages of protective components: spark gap, varistor and zener supressor. The maximum surge current withstand capability is 10 kV and the maximum output voltage is 41 V.
The types DT320 G and DT321 G have grounded outputs the DT320 F and DT321 F have floating outputs.
There are two versions of housing: the types DT320… are rail mounting for installation in cabinet, the types DT321… are IP65 protected for field installation.

Technical specifications

Safety data:
The connection terminals of the supply voltages are isolated from each other, the isolation is in compliance with the standard EN 61010-1, taking into consideration the following:
Pollution level:	2
Measurement category:	II
Input parameters:
Input signal:	DC current
Range:	0-35 VDC
Input current:	120 mADC (max.)
Input-output serial resistor:	30 ohm
Output parameters:
Output signal:	DC current
Range:	23.4 VDC (24 VDC input voltage at 20 mA output current)
Overvoltage protection:	41 V (limiter)
Ambient conditions:
Operating temperature range:	-20 - +60 °C
Relative humidity:	90% (max., non condensing)
Place of installation:	DT320 ... : cabinet	DT321 ... : field
General data:
Housing:	DT320 ... : terminal assembly box, rail mounting on TS-35 rail material: polyamide PA6.6	DT321 ... : polycarbonate box
Connection:	screw-fixed type connection	2 Pg 13.5 cable entry screw-fixed type connection
Connection cable:	2.5 mm² (max.)	3 × 1.5 mm² (max.)
Dimensions:	DT320 ... : 25 × 80 × 85 mm (width × height × depth)	DT321 ... : 80 × 120 × 55 mm (width × height × depth)
Weight:	cca. 0.1 kg	cca. 0.2 kg
Protection:	IP 20	IP 65

Detailed information see in operating instructions. The Manufacturer maintans the right to change the technical data!