Section 1 - Introduction; General; Circuit Breaker; Shunt Trip Device - Westinghouse DBN-1016 Technical Manual

CIRCUIT BREAKER
TABLE 1-0-3-VOLTAGE RATING
OF COMPONENTS
Nominal Voltage
Rating Range
Components (Volts) Volts
Closing Re lay 115 90-130
and Magnet 450 360-500
Shunt Trip
115
80-130
450 360-500
1-0-1-2 Auxiliary Switch
The interrupting capacities of the auxiliary
switch contacts are listed in Table 1-0-4.
TABLE 1-0-4-AUXILIARY SWITCH
Non-Inductive
Inductive
Volts Circuit
Circuit
115 a-c 75 amps. 15.0 amps.
450 a-c
25 amps.
5.0 amps.
Section l-Introduction
1.1·1 GENERAL
This technical manual describes a Navy
Type ACB 1600HR (Westinghouse
Type
DBN-
1016) 1600-ampere frame size air circuit
breaker, meeting the requirements of Specifica-
tion MlL-C-17587 for Naval Shipboard service.
Each circuit breaker is supplied as a complete,
removable switchboard assembly consisting of
circuit breaker, separable disconnects and as-
sociated control wiring, drawout mechanism and
assemhly structual supports and back plate in·
cluding stationary main bus connections and sta-
tionary terminals for connection of the necessary
external control wiring.
The complete, removable assembly consists
of two major components; the stationary com-
ponent that is bolted into the switchboard frame,
and the movable component which is the oper-
ating mechanism of the circuit breaker and may
be
drawn out for inspection, maintenance or
isolation from the shipboard electrical system.
The general arrangement of this equipment
is shown in figures 1-1-1 and 1-1-2.
The DBN-1016 air circuit breaker is a
complete, removable assembly for installation
within a switchboard cubicle.
The circuit breaker is designed as an as-
sembly including the drawout mechanism. These
assemblies incorporate disconnect features for
both main current connections and secondary
current connections. This mounting allows easy
'·2
removal and installation of the movable compo-
nent when maintenance operations are required.
The circuit breaker is closed electrically
from a local or remote control switch.
It
may
be tripped from the control switch or may be
tripped by depressing the "Push-To-Trip" button
which protrudes through the face plate.
For maintenance, the emergency closing
handle provides manual closing by inserting the
operating handle, through the face plate, into
the socket provided in the operating mechanism
and pulling the operating handle down (approxi-
mately 45 degrees) until the breaker latches.
The moving component consists of a rigid
steel chassis to which are bolted various sub-
assemblies. Each sub-assembly is a complete
unit and is readily interchangeable between
breakers.
In
addition, each sub-assembly may
be removed intact and easily replaced for mini-
mum outage time.
·The sub-assemblies requiredin all breakers
are the mechanism, pole units, arc chutes, aux-
iliary switch, secondary disconnects, anti-shock-
closed-device, anti-shock-open-device, closing
relay, and closing magnet. The remaining sub-
assemblies that may be included are overcurrent
trip devices and shunt trip device.
The air circuit breaker for three phase a-c
service is normally provided with overcurrent
trip devices in the two outer poles, otherwise
the three poles are identical.
(