Showing 469-480 of 1,100 results

Littelfuse · Relay Series
T4000.0040
Auto Synchronizer. 40 100/110V. The T4000 Auto-Synchroniser provides automatic synchronisation and connection of a generator to a live bus bar. The T4000 measures the voltage across two phases on either side of the circuit breaker in order to obtain data on frequency, phase and voltage deviation. The T4000 will automatically adjust the speed of the generator (through the speed controller) in order to match the frequency and phase to the live busbar. The speed output signal is a variable DC voltage, which can be easily matched to the speed trim input of an electronic speed controller. The magnitude of the output voltage is proportional to the frequency/phase deviation. When used together with the T4300 Load Sharer or T4400 Load Sharer, the speed output must be passed through the T4300 or T4400.
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Littelfuse · Relay Series
T7900.0010
Electronic Potentiometer. 24V DC/AC. The T7900 Electronic Potentiometer is typically used as an interface between a unit that provides increase/decrease contacts signals and electronic speed governors or voltage regulators (AVR) controlled by analogue voltage or current signals. The T7900 works much like a conventional motorized potentiometer (e.g. the E7800). However, instead of a variable resistance, the T7900 provides a variable voltage (e.g. -5 to +5 VDC), current (e.g. 4-20 mA) or a pulse width modulated signal (PWM). The voltage and current range is programmable. The PWM output provides a 500 Hz signal with programmable duty cycle. The analogue outputs are galvanically isolated.
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Littelfuse · Relay Series
T8400.0020
Blackout Limiter. 400V.3-3.5-4-4.5 sec.. The Blackout Limiter T8400 enables fast clearing of a blackout. If a blackout occurs, the first generator to have more than 90 percent voltage will make the generator breaker close. It is possible to monitor up to 4 generators with 1 unit and up to 8 generators with 2 units. If a blackout occurs, the first generator to have more than 90percent voltage will close the generator breaker.
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Littelfuse · SE 703 Series
SE-703-03
EARTH-LEAKAGE MONITOR - 24 VAC SUPPLY. The SE-703 is a microprocessor-based ground-fault relay for resistance- and solidly-earthed systems. It offers sensitive ground-fault detection as low as 25 mA and can be used on systems with significant harmonic content. The SE-703 provides feeder-level protection or individual-load protection. The output contacts can be connected for use in protective tripping circuits or in alarm indication circuits. The analog output can be used with a PLC or a meter. The SE-703 is specifically designed to be Australian AS/NZS 2081 compliant.
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Littelfuse · Relay Series
T3000.0010
T3000 Frequency Relay. 230V. The T3000 is intended for effective frequency surveillance on generators, busbar or other distribution systems. The relay contains the functions “under frequency” and “over frequency” time delayed, and 2 individual output relays, one relay for each function.
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Littelfuse · Relay Series
T3000.0020
T3000 Frequency Relay. 400/450V. The T3000 is intended for effective frequency surveillance on generators, busbar or other distribution systems. The relay contains the functions “under frequency” and “over frequency” time delayed, and 2 individual output relays, one relay for each function.
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Littelfuse · Relay Series
T3000.0080
Frequency Relay. The T3000 is intended for effective frequency surveillance on generators, busbar or other distribution systems. The relay contains the functions “under frequency” and “over frequency” time delayed, and 2 individual output relays, one relay for each function.
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Littelfuse · Relay Series
T3200.0010
Insulation Monitoring Relay. 230V. The Insulation Monitoring Relay T3200 is intended for continuous insulation monitoring on three phase insulated networks on board ships. The relay monitors continuously two systems galvanically separated from each other, e.g. the busbar and the lighting system, or two busbar systems. The unit features two output relays for alarm purposes and two analogue outputs for instrument reading. The instrument is not included with the relay. Instruments are available from as standard sized switchboard component.
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Littelfuse · Relay Series
T3200.0030
Insulation Monitoring Relay. 415/480V. The Insulation Monitoring Relay T3200 is intended for continuous insulation monitoring on three phase insulated networks on board ships. The relay monitors continuously two systems galvanically separated from each other, e.g. the busbar and the lighting system, or two busbar systems. The unit features two output relays for alarm purposes and two analogue outputs for instrument reading. The instrument is not included with the relay. Instruments are available from as standard sized switchboard component.
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Littelfuse · Relay Series
T4500.0020
Auto Synchronizer. 230V 5A. The T4500 Auto-Synchroniser provides automatic synchronisation and connection of a generator to a live bus bar. The T4500 measures the voltage across two phases on either side of the circuit breaker in order to obtain data on frequency, phase and voltage deviation. The T4500 will automatically adjust the speed of the generator (through the governor) in order to match the frequency and phase to the live busbar. Two built-in relays provide the increase and decrease pulses for a conventional governor. The strength (width) of the pulses is proportional to the frequency/phase deviation. The E7800 Motorised Potentiometer can be used to adapt the contact pulses to a signal suitable for the speed trim input of an electronic speed controller. The T4500 will continuously adjust the generator speed until frequency and phase is within limits. The signal to close the circuit breaker is issued just before phase accordance is obtained. This is done in order to compensate for the circuit breaker make time.
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Littelfuse · Relay Series
T4800.0020
Load Sharer. 230V 5A. The T4800 is designed to control a generator operating in parallel with the grid, or a generator operating in parallel with other generators (which are also controlled by T4800 units). The T4800 will continuously measure and compare the active current on the generator to an external DC reference signal connected to the “parallel lines” input. The T4800 will increase or decrease the speed of the generator (through the governor) if it finds the active current level to be either too low or two high. Two built-in relays provide the increase and decrease pulses for a conventional governor. The strength (width) of the pulses is proportional to the frequency/phase deviation. The E7800 Motorised Potentiometer can be used to adapt the contact pulses to a signal suitable for the speed trim input of an electronic speed controller.
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Littelfuse · Relay Series
T4800.0070
Load Sharer. 100/110V 5A. The T4800 is designed to control a generator operating in parallel with the grid, or a generator operating in parallel with other generators (which are also controlled by T4800 units). The T4800 will continuously measure and compare the active current on the generator to an external DC reference signal connected to the “parallel lines” input. The T4800 will increase or decrease the speed of the generator (through the governor) if it finds the active current level to be either too low or two high. Two built-in relays provide the increase and decrease pulses for a conventional governor. The strength (width) of the pulses is proportional to the frequency/phase deviation. The E7800 Motorised Potentiometer can be used to adapt the contact pulses to a signal suitable for the speed trim input of an electronic speed controller.
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