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Effective: January 1997

Supersedes 41-842C Dated May 1992

( | ) Denotes Change Since Previous Issue

CAUTION

Before putting relays into service, remove all blocking

which may have been inserted for the purpose of secur-

ing the parts during shipment, make sure that all mov-

ing parts operate freely, inspect the contacts to see that

they are clean and close properly, and operate the relay

to check the settings and electrical connections.

1. APPLICATION

he TRB Zener tripping unit is an auxiliary device energized

by protective relays to trip circuit breakers in a double trip

relaying scheme. It is suitable for cases where the total trip

current of the two breakers is within the relay contact rating,

usually 30 amperes. The TRB-2 unit can also be used for

isolation of multiple trip paths to one breaker.

2. CONSTRUCTION AND OPERATION

TRB Zener tripping units consists of 50-watt Zener diodes

on brass plates contained within a short metal cage and

mounted on a small molded base. The TRB-2 unit contains

two diode circuits which are completely independent from

each other. These circuits may have only one diode each

or, in the case of 250 Vdc ratings, may each have two di-

odes in series.

Type

Rating

TRB-2

125Vdc

TRB-2

250Vdc

TRB-3

125Vdc

TRB-4

125Vdc

All possible contingencies which may arise during installation, operation or maintenance, and all details and

variations of this equipment do not purport to be covered by these instructions. If further information is desired

by purchaser regarding this particular installation, operation or maintenance of this equipment, the local ABB

Power T&D Company Inc. representative should be contacted.

Printed in Coral Springs, FL

ABB Power T&D Company Inc.

Power Automation and Protection Division

Coral Springs, FL 33065

Characteristics and Ratings

Maximum

One

Sec.

Diode

Rating

1N2846

30 Amps

1N2846

30 Amps

1N2846

30 Amps

1N2846

30 Amps

Type TRB

Zener Tripping Unit

TRB-3 units contain three diodes, two of which have a

common anode terminal and separate cathode terminals.

The third diode is completely independent from the other

two.

TRB-4 units contain four diodes in two completely inde-

pendent circuits. Each circuit has two diodes which have

a common anode terminal and separate cathode termi-

nals.

The TRB Zener tripping unit is energized through the con-

tacts of protective relays as shown in Figure 1. Relay con-

tacts PR trips two breakers through diodes D1 and D2.

However, relay contacts #1 and #2 can energize only

their own related breakers #1 and #2 respectively be-

cause current flow to the adjacent breaker trip coil is

blocked by diodes D1 and D2. Thus relays associated

with each particular breaker are isolated from the other

breaker, yet both breakers can be tripped, without addi-

tional time delay, by the operation of a common relay.

Transient voltages induced into the diode circuits in ex-

cess of their reverse blocking rating can be tolerated with-

out damage to the diodes. This feature results from the

zener characteristic which allows current to flow in the re-

verse direction and limits the voltage across the diode.

Maximum

Forward

Reverse

Volts

Leakage

Drop

Micro Amps

at 152 Volts

1.5

3.0

1.5

Instruction Leaflet

41-842D

Zener

Reverse

Maximum

Voltage

Zener

In Volts

Current

200 ± 10%

75 mA

400 ± 10%

75 mA

200 ± 10%

75 mA

200 ± 10%

75 mA