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 Project
Describtion Parallel
Operation Switching
Devices PLC
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 Two
types are available in the miniature line. These are:
- People Protection-This
breaker type automatically senses hot wire to ground faults and trips the
breaker when a ground fault exists. It is most commonly used in bathrooms,
kitchens, swimming pool areas, and outdoor receptacles. It senses ground
faults at 5 milliamps, a level low enough to protect people.
- Equipment
Protection-This breaker type
is designed to protect equipment against damage from arcing ground faults.
It is typically applied to computers, process control and heating equipment.
The circuit breaker trips at 30 milliamps.
- Shunt Trip-This
breaker type provides remote-controlled tripping of a circuit breaker.
However, it is not a device for remotely operating a breaker. An
intermittent rated solenoid-tripping device is mounted in the breaker. The
tripping device must be energized by a control power source of AC or DC
voltage.
Figure 10. Shunt Trip
It
is used for emergency disconnects for food service equipment such as grinders,
slicers, fryers, and mixers. Other uses include pump panels, remote disconnects
for UPS (uninterruptable power supply) devices, and power supply control for
sequentially powering down a mainframe computer.
This
breaker type requires an extra pole space in the loadcenter. It can run on 120,
208, or 240 VAC. A separate source voltage is required.
Accessories
A
number of accessories are available. These include:
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Undervoltage
Release
For
undervoltage protection, a solenoid device mounts within the breaker
cover and trips the breaker within a range of 35% to 7-% of the rated
coil voltage. It is reset by manually opening and closing the breaker
handle.
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Alarm
(Signal)/Lockout Switch)
For
remote indication of an automatic trip operation. It does not function
with manual switching. The switch automatically resets when the
breaker is rest.
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Auxiliary
Switch
For
auxiliary control circuits. Miniature switches mount within the
breaker cover. Commonly used for remote indication of the breaker's
open or closed status, as well as electrical interlocking functions.
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Lock
Dog
For
non-padlockable systems using 1-, 2- and 3-pole breakers.
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Padlockable
Front Cover
For
padlockable systems using 1-, 2- and 3-pole breakers.
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DIN-Rail
Adapter
For
systems using 1-, 2- and 3-pole breakers. This alternate mounting
method permits DIN-rail mounting of breakers.
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