Littelfuse D0920 User Manual

Protection Relays & Controls

Arc-Flash Monitoring

D0920 ARC DETECTION UNIT

Arc Detection Unit

Installation Diagram

Description

The D0920 Arc-Flash relay provides a simple and cost
effective solution for Arc-Flash monitoring. Two light sensors
can be connected directly to one relay.

Light Sensors react to light and have a 180º detection zone.
Sensors are supplied with 10 or 15 m of cable. 1-2 sensors
are recommended per cubicle or drawer.

Features & Benefits

FEATURES BENEFITS

Compact module

Trip time <1 ms

Two optical sensor
cable lengths

Inputs for two
sensors

Adjustable light
sensitivity

Service mode

Fits into wide range of Arc-Flash applications

Limits Arc-Flash damage and risk of injury

Point sensors with 10 or 15 m of cable

Single Arc-Flash relay can monitor 2 sensors

Allows operation in bright environments and maximum
sensitivity in dark environments

Allows relay and sensor test without tripping system

Install sensors in line
of sight to possible arc faults.

Ordering Information

ORDERING NUMBER CONTROL POWER

D0920.0010

D0920.0020

ACCESSORIES REQUIREMENT

A0033.0010 Detector cable
2 x 0.25 mm2 w/screen. 100 m

A0220.0010 Arc Detector V-Type; 10 m cable
A0220.0020 Arc Detector V-Type; 15 m cable

PGA-1100/D1100 Diode Logic Unit

230 V AC +15, -30%

230 V AC +15, -30%, remains powered on after trip

Optional

Required: At least one
sensor per monitored zone

Optional

Accessories

A

A0220 Light Sensors

Line-of-sight light sensor detects an arc as small
as 3 kA within a 2-m half-sphere. Available with
10 or 15 m cable.

PGA-1100/ D1100 Diode Logic

For tripping one circuit breaker with multiple
D0920 Relays

Specifications

Supply Voltage 230 V AC
Thyristor Output 325 V DC from charged capacitor, nominal energy 3.5 J
Sensitivity Adjustable 2 - 24 klux
Number of Sensors Max. 2
Response Time Less than 1 ms
Power Consumption 3.5 VA
Ambient Temperature –25°C to 70°C
Dimensions H 90 mm (3.5”); W 105 mm (4.1”); D 75 mm (3.0”)
Certification CE

+15,-30%

© 2014 Littelfuse Protection Relays & Controls

Based on Manual Rev: 0-B-011014

Rev: 4-A-021014