CTB-B-B-09 Carling Technologies, CTB-B-B-09 Datasheet - Page 4

• Manufacturer Part Number: CTB-B-B-09
• Description: CIRCUIT BREAKER ROCKER 9A SP BK
• Manufacturer: Carling Technologies
• Series: CTBr

Specifications of CTB-B-B-09

• Breaker Type: Thermal
• Voltage: 50VDC, 125/250VAC
• Current - Trip (it): 9A
• Number Of Poles: 1
• Actuator Type: Rocker
• Mounting Type: Panel Mount
• Product Type: Circuit Breakers
• Current Rating: 9 Amps
• Voltage Rating: 250VoltsAC, 32 VoltsDC
• Trip Time: 2.2 s to 15 s
• Mounting Style: Through Hole
• Termination Style: Quick Connect
• Color: Black
• Illuminated: No
• Length: 38.99 mm
• Product: Thermal Circuit Breakers
• Width: 13.71 mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 432-1129

4
Any electrical or electronic equipment that is designed without
including circuit protection is an accident waiting to happen.
Under normal operating conditions, this may not appear to be
a problem. However, normal operating conditions are not
always guaranteed. Under strained or heavy use, a motor
and/or another load-generating component within the equip-
ment will draw additional current from the power source; when
this happens, the equipment’ s wires and/or components will
overheat and may ultimately burn up. Also, power surges and
short circuits in unprotected equipment can cause extensive
damage to the equipment and to the conductors leading to the
equipment.
In addition to protecting the equipment, the entire electrical
system including the control switches, wires, and power source
must be protected from faults. A circuit protection device
should be employed at any point where a conductor size
changes. Many electronic circuits and components like trans-
formers have a lower overload withstand threshold level than
conductors such as wires and cables. These components
require circuit protection devices featuring very fast overload
sensing and opening capabilities.
Introduction
Available Choices of Circuit Protection
Carling Technologies offers three types of circuit protection
devices: thermal circuit protectors, hydraulic/magnetic circuit
protectors/breakers and equipment leakage circuit breakers.
This catalog features our thermal circuit protection product line.
For details related to hydraulic/magnetic circuit protection and
equipment leakage circuit breaker products, please see our
Circuit Protection 403 catalog.
Thermal circuit protectors utilize a bimetallic strip electrically in
series with the circuit. The heat generated by the current dur-
ing an overload deforms the bimetallic strip and trips the
breaker. Thermal protectors have a significant advantage over
fuses in that they can be reset after tripping. They can also be
used as the main ON/OFF switch for the equipment being pro-
tected.
Hydraulic/magnetic circuit protectors/breakers provide highly
precise, reliable and cost effective solutions to most design
problems. The hydraulic/magnetic circuit breaker is considered
to be temperature stable and thus is not appreciably affected
by changes in ambient temperature. It’ s over-current sensing
mechanism reacts only to changes of current in the circuit
being protected. It has no "warm-up" period to slow down its
response to overload. It has no "cool-down" period after over-
load before it can be reset. The characteristics of a
Specifying a circuit protection device for an application is not a
difficult task, but it will require some thought. If electrical and
electronic equipment is designed with over-specified circuit
protection devices they will be vulnerable to the damaging
effects of power surges and the catastrophic results of a fire;
while using under-specified circuit protection devices will result
in nuisance tripping.
The short circuit capacity of a circuit protection device should
be greater than the circuit’ s available short circuit fault current.
Available short circuit current is the maximum RMS current that
would be present if all the conductors were to be connected
directly to the fault location. In reality, this is not the case. The
actual short circuit current is much less than the available short
circuit current. The actual short circuit current is reduced due to
the combined impedance of the conductors, the size of the
transformer and other current restricting components within the
circuit.
The application’ s environmental conditions must be considered
when selecting the proper circuit protection device. Excessive
temperature, humidity, severe vibration and shock can cause
adverse performance characteristics in many types of circuit
protection devices. For instance, a fuse element is less reliable
when it is hot than when it is cold.
hydraulic/magnetic circuit breaker can be tailored in four sepa-
rate areas: the desired circuit; the trip point (in amperes); the
time delay (in seconds); and the inrush handling capacity of
the breaker. These factors can be varied with relatively little
impact on the short circuit capability of the breaker. Typically,
hydraulic/magnetic circuit breakers are available with a choice
of three different trip time, delay curves: slow, medium and
long. These choices provide the designer with a high level of
design flexibility when matching the breakers trip time delay
curves to other circuit protection devices in a cascade, or dis-
criminating circuit. In addition, special hi-inrush constructions
are available for equipment with severe inrush characteristics.
Equipment leakage circuit breakers function as hydraulic/mag-
netic circuit breakers, offering customized overload and short
circuit protection. In addition, they sense and guard against
faults to ground using innovative electronics technologies. With
the exception of small amounts of leakage, the current return-
ing to the power supply will be equal to the current leaving the
power supply. If the difference between the current leaving and
returning through the earth leakage circuit breaker exceeds the
leakage sensitivity setting, the breaker trips and it’ s LED illumi-
nates. The LED gives a clear indication that the trip occurred
as a result of leakage to ground. This protection helps prevent
serious equipment damage and fire.
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