Brochure

PowerPact H-, J-, and L-Frame Circuit Breakers
Accessories and Auxiliaries
131
02/2016
© 2011–2016 Schneider Electric
All Rights Reserved
Manual Mechanical Interlocking Systems
Some installations use two power supply sources to counter any temporary loss in the main supply. A
mechanical interlocking system is required to safely switch between the two sources. The replacement
source can be a generator set or another network.
Managing multiple power sources can be controlled manually by mechanical interlocks.
The mechanical interlocking system is made up of:
• two H-, J-, or L-frame devices (circuit breakers or switches) controlled manually
• mechanical interlocking, which prevents handle movement from the OFF position while the other
device is in the ON position.
Since it is controlled manually by a maintenance technician, switchover time from the normal source to
the replacement source can vary.
Figure 9: Interlocking Systems
H- and J-Frame
L-Frame
Interlocking with Toggle Control (S29354)
Interlocking with Rotary Handles (S29369)
push
push
to
t
ri
p
push
to
trip
push
to
trip
pus
h
t
o
trip
ON
I
O
OFF
push
to
tri
p
ON
I
O
OFF
ON
I
O
tripped
tripped
ON
I
OFF
O
reset
reset
OFF
Interlocking with Toggle Control (S32614)
Interlocking with Rotary Handles (S32621)