ABB - Miniature circuit breaker, Application guide.pdf

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Miniature circuit breaker
Application guide
Index
Miniature circuit breaker application guide ............................................. 1 - 8
Circuit breaker construction..................................................................................................2 - 3
Circuit breaker current limitation ...........................................................................................4 - 5
General information.................................................................................................................... 1
Miniature circuit breaker components ....................................................................................... 8
Selective coordination and series ratings .............................................................................6 - 7
Low Voltage Products & Systems
I
ABB Inc. • 888-385-1221 • www.abb-control.com
1SXU400142M0201
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Notes
II
Low Voltage Products & Systems
1SXU400142M0201
ABB Inc. • 888-385-1221 • www.abb-control.com
166741489.012.png
 
Miniature circuit breaker
Application guide
Introduction
The circuit breaker plays an important role in providing over-current
protection and a disconnect means in electrical networks. Recent
advancements in circuit breaker technology has increased breaker
performance and protection.
Breaker deinition
A breaker is a device designed to isolate a circuit during an overcurrent
event without the use of a fusible element. A breaker is a resettable
protective device that protects against two types of overcurrent
situations; Overload and Short Circuit.
Overload
A slow and small overcurrent situation that causes the ampacity and
temperature of the circuit to gradually increase over time. This type of
event is characterized by a slight increase in the load (ampacity) on the
circuit and is interrupted by the thermal trip unit of the breaker.
ABB current limiting breaker
Tripping lever
Electro-magnetic protection
Upper
terminal
Thermal Example
10A
15A
Thermal
protection-
bimetal
Operating
mechanism
Breaker
Light
The light draws more than 10 amps for
an extended period of time creating a
thermal overload.
Operator
Short circuit
A rapid and intense overcurrent situation that causes the ampacity of
the circuit to increase. This type of event is characterized by a dramatic
increase in the load (ampacity) on the circuit and is interrupted by the
magnetic trip unit of the breaker.
Arc
chamber
Magnetic Example
10A
10A
Fixed
contact
Space for
identification
marker
Moving
contact
Breaker
Light
The wire connected between the light and
breaker is cut and shorted to ground
creating a short circuit.
Lower terminal
DIN rail holder
Low Voltage Products & Systems
1
ABB Inc. • 888-385-1221 • www.abb-control.com
1SXU400142M0201
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