TM 9-2320-211-20
(6) 110-volt circuit breaker box. The 110-volt
doors and right rear door. Each switch is actuated
by an adjustable plunger operated by a striker plate
circuit breaker box (fig. 2-232) provides a
attached to the top of the door. Thus, when the
distribution and control station for all equipment
door is opened, the plunger actuates the switch
requiring 110-volt ac power. It contains 12 push
type circuit breaker switches, electrically connected
which in turn trips the blackout relay and in-
terrupts the lighting and receptacle circuits.
in three groups of four each. Each group is con-
(10) Hinged
r o o f - o p e r a t e d p l u n g e r s and
nected to one leg of the 3-phase power system, thus
plates. Blackout circuit contact plungers (fig. 2-
providing three individual 110-volt branch circuits.
233) are located in the edges of the hinged roof
Six of the circuit breaker switches are used in the
van body electrical system. The remaining six are
sections so as to aline with striker plates in the
mating edges of the hinged floor sections and side
available for use with tactical materiel installed in
panels. The plungers and mating plates maintain
the van body, as required. The circuit breakers
continuity of the blackout circuits when the van is
function as primary control switches for all 110-volt
in both the expanded and retracted positions.
equipment, and a l s o p r o v i d e p r o t e c t i o n f o r
o v e r l o a d e d circuits. The circuit breaker box is
covered by a large door which provides access to the
interior wiring compartment for maintenance. A
smaller door, equipped with a lock and key, permits
access to the circuit breaker switches. A circuit
identification directory plate is attached to the
inner side of the smaller door.
(7) B l a c k o u t r e l a y . T h e b l a c k o u t r e l a y i s
located inside the circuit breaker box (fig. 2-232).
It is a single-pole, double-throw, magnetic type
r a t e d at 60 amperes at 110 volts. The relay
a u t o m a t i c a l l y interrupts the van lighting and
receptacle circuits whenever the doors are opened,
provided the main blackout circuit switch is in the
ON position. However, the individual receptacle
blackout switches can override the relay when the
operating equipment m u s t b e i n c o n t i n u o u s
operation or is not a blackout hazard.
(8) Main blackout circuit switch. T h e m a i n
(11) Receptacle and blackout switches. T e n
blackout circuit switch (fig. 2-232) controls the
combined
and blackout switches
blackout circuit. In the ON position, the switch
located in the van ceiling and front wall (fig. 2-231
includes the blackout relay in the lighting and
and 2-234) provide power outlets for operation of
receptacle circuits so that these circuits are in-
the 110-volt equipment housed in the van. The
terrupted by the door-operated switches. In the
integral blackout switches are used to bypass the
OFF position, the switch bypasses the blackout
blackout feature when equipment must remain in
relay, eliminating the function of the door-operated
c o n t i n u o u s operation, or does not involve a
switches.
blackout hazard. Cord holder hooks (fig. 2-234)
(9) Door-operated blackout switches. T h r e e
are placed adjacent to the ceiling receptacles to
6-ampere, 110-volt, pushbutton type door-operated
prevent accidental disconnection o f t h e p o w e r
blackout switches (fig. 2-232) are located in the van
cords.
wall near the top of the hinged sides of the two side
