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A.C.
Current with Adjustable Time Delay
250 series A.C. current protectors provide continuous
surveillance of the monitored circuit. When the current
moves outside the setpoint limit, the relay operates. The
protector can be used to monitor over and under current
conditions, load detection, and for monitoring electric
heating systems. An illuminated LED indicates when the relay
is energized. For 3 phase systems, the sequence of
connection is not important. |
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A.C.
Voltage with Adjustable Time Delay
The A.C. voltage protectors provide continuous surveillance
of the monitored circuit. When the measured voltage moves
outside the setpoint limit, the relay will operate after the
selected time delay, giving an alarm or initiation signal.
Relays normally energize on overvolts and de-energize on
undervolts. An illuminated LED indicates when the relay is
energized. |
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A.C.
Voltage with Adjustable Differential
The A.C. voltage protectors provide continuous surveillance
of the monitored circuit. When the measured voltage moves
outside the setpoint limit, the relay will operate giving an
alarm or initiation signal. The protector can be used for
under and over voltage detection, start standby generators,
operation of mains failure units, and switching standby
supplies. An illuminated LED indicates when the relay is
energized. The 3 phase, 3 or 4 wire models, protect each
phase independently. |
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Frequency
Crompton frequency protectors give continuous surveillance
of the monitored circuit. When the frequency moves outside
the set point limit the relay will operate giving an alarm,
control or tripping signal. An illuminated LED indicates
when the relay is energized. Since speed is proportional to
the frequency, this protector can be used to monitor over
and underspeed, and to protect mains supplies, computer
supplies, and
standby supplies for Industrial, Hospital or Marine use. |
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Combined
Under/Over Voltage and Frequency
The 250 series combined voltage & frequency protectors
provide continuous surveillance of the monitored circuit.
When the voltage or frequency moves outside the set point
limit the respective relay will operate giving an alarm,
control or tripping signal. An illuminated LED indicates
when the relay is energized. This protector can be used to
protect against over and underspeed and over and under
voltage. |
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Phase
Sequence and Phase Failure
The Crompton phase sequence and phase failure protector
relays are designed to monitor the correct phase rotation or
sequence of three phase, 3 or 4 wire supply systems and
provide protection against incorrect phase sequence, loss of
one phase, and under voltage. |
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Phase
Balance
The 250 series phase balance protector module provides
continuous surveillance of a 3 phase, 3 or 4 wire system and
monitors the correct phase rotation or sequence of three
phase supply systems. The module protects against phase
loss, reversal or sequence, phase unbalance, and system
under voltage. |
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Reverse
Power (Current)
The reverse power protector provides continuous surveillance
for A.C. generators operating in parallel or for boosting
mains supplies. On site adjustment of the trip point and
time delay ensures accurate protection against ‘motoring’ in
the event of engine failure and prevents tripping from
surges during synchronizing. |
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Synchro-Check
(paralleling)
The synchro-check relay can be used to assist in the
semi-automatic paralleling of two AC power systems. The
volt-free relay contacts change state when the voltage
level, phase relationship and frequency are within the
selected synchronizing limits. Connecting two
electrical systems that are not closely matched can cause
expensive damage and disturbance to the electrical system.
Using this relay will ensure that damage will not occur. |
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D.C.
Voltage
DC voltage protectors provide continuous surveillance of the
monitored voltage circuit, typically a battery supply or
charging circuit. When the measured voltage moves outside
the set-point limits, the relay will operate after the
selected time delay or differential, giving an alarm and/or
initiation signal. The protectors offer protection for under
voltage, over voltage and battery level control. |
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Thermistor
Trip
Many motors, transformers and generators are fitted with
positive temperature coefficient thermistor temperature
sensors, the addition of a thermistor trip relay will
provide full protection against sustained overload, single
phasing, locked rotor, blocked ventilation and high ambient
temperature. Thermistor trip relays continuously monitor the
working temperature inside electrical equipment. When the
temperature exceeds a safe limit, the relay can be used to
shut equipment down until it regains a safe operating
temperature. |
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Hot Spot 3
Temperature Relay
The Hot Spot 3 relay accepts up to three inputs from
resistance temperature detectors (RTD) and provides up to
three user adjustable trip points which can be used to
initiate alarms, cooling systems or shutdown. The relay is
ideally suited for the protection of electric motor
windings, transformers, generator windings and bearing
temperature. The analog output can be used for remote
monitoring of high temperatures. |
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Hot Spot 6
Temperature Relay
The Hot Spot 6 protector is a temperature trip relay
accepting up to six inputs from resistance temperature
detector (RTD) elements and provides one user adjustable
trip point which can be used to initiate alarms, cooling or
shutdown when the monitored temperature exceeds the set
limit. The relay is ideally suited for the protection of
electric motor windings, transformers, generator windings
and bearing temperature. |
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D.C.
Millivolts / Thermocouple
The 250 series millivolt protectors provide continuous
surveillance of high DC currents when used with current
shunts, or can be used to monitor temperatures in
conjunction with thermocouples. The protector incorporates a
user adjustable trip and time delay which can be set to
initiate an alarm when the input exceeds the desired level. |
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D.C.
Transducer Trip
DC transducer protectors provide continuous surveillance of
the DC process voltage or current signal. When the standard
process signals move outside the setpoint limit the relay
will operate. Combining the protection relay with a
measuring transducer such as the Crompton ‘Paladin’ range
can form specialized control products whenever self
contained relays are not available. |
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Speed
Sensing
The 250 series speed sensing relay monitors rotating
equipment and provides three output contacts which can be
used to initiate alarm or shutdown signals. The relay also
provides a tachometer output for speed indication. Speed
sensing relays are ideally suited for engine and gas turbine
monitoring and the protection of generator sets. |
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