| Megger / Multi-Amp CB-832 Circuit Breaker and
Overload Relay Test Set
The Megger CB-832 test se
is a high-current circuit breaker andoverload
relay test set. Model CB-832 is designed to testthe
circuit breaker and overload relays by means ofprimary
current injection.The Megger CB-832
is a self-contained test set that incorporates a variable
high-current output and appropriate controlcircuitry
and instrumentation for testing thermal, magneticor
solid-state motor overload relays; molded-case circuitbreakers;
and ground-fault trip devices.
One of the most
common applications of the Megger / Multi-Amp CB-832 is thecalibration
of magnetic overload relays, such as thoseused
for protecting air conditioning systems. By providingup
to 1000 amperes to simulate overload conditions, it alsois
capable of testing the time-delay characteristic ofmagnetic
overload relays rated up to 500 amperes.
In addition, the
Megger / Multi-Amp CB-832 can test the time-delaycharacteristics
of thermal motor overload relays andmolded-case
circuit breakers rated up to 225 amperes,when
following the recommended test procedure oftesting
the time delay of thermal devices at three timestheir
rating.
Higher currents are
available for the short durationsrequired to
test an instantaneous trip element. Forexample,
the test set will provide a short-duration outputof
1800 amperes through a typical 225 ampere, molded casecircuit
breaker. Additional applications includeverifying
the ratio of current transformers.
Specifications:
Input (specify one)
120 V OR 240 V, 50/60 Hz, 1 Φ
Output
Output Ranges: Continuously
adjustable in three ranges to meeta variety
of test circuit impedances:
0 to 500 A at 3.5 V
max.
0 to 125 A at 14 V
max.
0 to 25 A at 70 V
max.
Output Capacity: The
output circuit is designed to provide short durationoverloads.
The output ranges will provide several times their current rating,provided
the output voltage is sufficient to push the desiredcurrent
through the impedance of the test circuit.The
test set is capable of testing the time-delay characteristics ofmagnetic
overload relays rated to 500 A using a test current oftwo
times their rating (1000 A).
| Overload
Capability |
| Percent
Rated Current |
Maximum
Time On |
MaximumTime Off |
| 100
(1x) |
30
min |
30
min |
| 200
(2x) |
3
min |
8
min |
| 300
(3x) |
30
s |
4
min |
| 400
(4x) |
7
s |
2
min |
It will test the
time-delay characteristic of thermal devices rated up to
225 A using the recommended test current of three times their rating
(675 A).Also, to perform an instantaneous
trip test, it will provide 1800 Athrough a
typical 225-ampere, molded-case circuit breaker.
Overload Capability: To
increase use of the test set, it isdesigned
so that the current ratings may be exceeded for shortdurations.Because the magnitude of the output current is
determined by theimpedance of the load
circuit, the voltage rating must be sufficientto
push the desired current through the device under test and theconnecting
test leads.
Output Initiate Circuit: The
test set uses a solid-state outputinitiating
circuit. To increase reliability and eliminate contactmaintenance,
this circuit uses a triac instead of a contactor toinitiate
the output.
Output Initiate Control
Circuit: The initiating
control circuitprovides momentary and
maintained modes to control outputduration.The momentary mode is used whenever the output is to
be for ashort duration. An example is an
instantaneous trip test, or toavoid damage
or overheating of the device under test whilesetting
the test current.In the maintained mode, the
output remains energized untilmanually
turned off or, when performing timing tests, until thedevice
under test operates this both stops the timer and deenergizesthe
output. |
