Electrical Relays

Product Details:

Product Details:

Applications

* Portable pumps
* Portable compressors
* Motor driven mixing equipment
* Motors
* Gensets - correct engine rotation
* All portable motorised equipment
* All rotating machines


Features

* Phase Sequence
* Phase Loss
* Adjustable unbalance Voltage
* Testing Simulation
* Automatic, manual & remote reset available
* LED indication for Trip & Power ON
* 2 pole relay contacts
* Polycarbonate casing (UL 94 V-0)
* Protective clear terminal cover (UL 94 V-0)

Product FunctionMPR is a phase failure relay operating on negative sequence voltage sensing principle. It offers protection against.

* Phase sequence reversal condition
* Phase failure condition.
* Unbalanced voltage condition MPR is an auxiliary relay and it should be used along with the motor starter only. The effective working of MPR will depend on efficient working of electromagnetic motor starter. Before installing MPR check whether the motor starter is operating perfectly by starting the motor with "START" push button and switching it off by "OFF" push button. If motor does not "START" or "STOP" on respective operations, the starter needs to be serviced. Do not install MPR with faulty motor starter.Trip Setting: Relay can be set to trip the starter for any unbalance voltage between 30 V to 70 V 9V between any two phases. Time Delay: MPR offers sufficient Trip time delay of 3 - 4 Sec. for all, Phase Sequence, Phase Loss and Phase unbalance conditions, to prevent nuisance tripping and hence protects motor. Reset: The relay can be set in Auto reset or manual & remote reset mode by removing or putting a short link between terminal 11 & 12. Relay can be remotely reset by extending the remote reset push button provided on terminal 10 & 11 (Use continuous cable at max. distance of 100 meters) Relay will reset if unbalance voltage is reduced to less than 20 V between all three phases.

Product Details:

Product Details:

ApplicationsThe Speed Sensing Relay provides three user adjustable trip levels with LED relay state indicator and a speed indicator output signal.The trip functions provided are :* SP1 - Disengages the crank starter * SP2 - Energises protection or under-speed alarm. * SP3 - Alarm or trips on over speed Engine monitoring * Generator set protection * Gas turbine monitoring * Monitor the engine governer FeaturesThe unit also incorporates the following protection features :* Open circuit sensor detection - a break in the sensor lead will de - energise the over - speed relayZero reset cranking - The crank relay will only reset when the input frequency falls below 20% of the crank set point. * Under speed alarm or load shedding * Over speed alarm or load shedding * Fail Safe Operation Product FunctionThe protector continuously monitors the rotations speed, and updates the analog output signal. An output of 0.75mA indicates normal speed (100%) while 1mA indicates 133% of nominal speed. The calibration point can easily be user adjusted. Three setpoint control adjustments allow setting of the desired speed limits for cracking. Under speed and over speed. Cranking Relay : Will detect if the engine is running or stopped. This relay can be used to ensure the cranking Motor is disconnected, once the engine has started running. Set the cranking setpoint just above the cranking motor speed. A red LED illuminates when the relay is energised, indicating a trip condition. Under speed Relay : Will detect when the normal running speed has been achieved. This can be used to enable the generator’s electrical protection. It can also be used to trigger load shedding. A red LED illuminates when an under speed condition exists. Over speed Relay : Will detect when a stuck throttle or over shoot, and can be used to shut down the engine. A red LED indicates over speed trip. Fail safe operation : The relay Will detect an open circuit speed sensor, and de – energise the over - speed relay.

Product Details:

The Transducer trip will accept analogue signal from most measuring transducer and transmitters, in the form of DC voltage or currents. Inputs are monitored within the preset limits and in the event of the input moving outside these limits.


Applications

* Forward / Reverse Watts
* Under / Over Watts
* Forward / Reverse VAr
 * Under / Over VAr
* Under / Over VA
* Power Factor monitoring And Control

Features

* Adjustable setpoint
* Adjustable Time delay
* Internal differential ( factory Settable )
* LED trip indication
* 2 pole relay contacts
* Energize/De-energize function swapping
* Auto Reset

Principle of operation The input current is fed through a resistor and the resultant voltage is compared with a preset reference voltage from the set point potentiometer. Any voltage difference forms a command signal which is fed via an amplifier to double pole changeover relay. As standard, the relay energises at high set point on a rising signal and de - energises at low set point on a falling signal.

Product Details:

The Protector is designed to monitor the correct phase rotation or sequence of 3 phase system L1, L2, L3. Rotating machines are particularly vulnerable to incorrect phase sequence.

Applications

* Portable pumps
* Portable compressors
* Motor driven mixing equipment
* Motors - Single Phasing
* Gensets - correct engine rotation
* All portable equipment
* All rotating machines An illuminated LED indicates when the relay is energised.

This relay can be used to protect:

* Portable electrical equipment
* Incorrect sequence connection
* Loss of one phase


Features

* LED trip indication
* 2 pole relay contacts
* Auto Reset Product Function The protector continuously monitors the three phase supply. With the correct phase sequence applied, the front panel LED will illuminate & the output relay will be energised. An incorrect sequence or missing phase will de-energise the relay, & the LED will be extinguished. If the supply drops below 85% of its nominal voltage, this condition will also cause a trip.

Product Details:

The protector DE-energizes a relay should any one of the above faults occur. It is fitted with an adjustable time delay to eliminate premature operation on short duration supply fluctuations. A red LED indicates that the supply is within limits & that the output relay is energized.


The phase unbalance feature will protect motors of any size against: Excessive temperature rise due to unbalanced supplies ( e.g. a 10% unbalanced supply can increase the temperature rise by 150%) The regenerated voltage generated during a single phase failure when running at low load.

Applications

• Portable pumps
• Portable compressors
• Motors - Single Phasing
• Gen sets - correct engine rotation
• All portable equipment
• All rotating machines

Features

• Adjustable set point
• Adjustable time delay
• LED trip indication
• 2 pole relay contacts
• Internal Differential
• Auto Reset

Principle of Operation The protector comprises monitoring circuits for voltage phase reversal and phase unbalance. Outputs from these circuits are fed to a comparative which changes state under fault conditions. When the compactor trips, the output relay will DE-energise after a preset time delay & the red LED will then no longer be lit. The relay and LED will automatically energies again when all the supply parameters have returned to safe and acceptable limits.

Additional Information:

• Item Code: RELAY-PBR
• Port of Dispatch: By Road
• Production Capacity: 10000
• Delivery Time: Immediately

Product Details:

The Reverse Power Protector provides continuous surveillance for AC generators operating in parallel or for boosting mains supplies.On site adjustment of the trip point and time delay ensures accurate protection.

Applications

The Rishabh 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 synchonising.
* Generator Set Protection - For detecting loss of the prime mover ( engine ) and preventing motoring.
* Feeder protection - To detect reverse power under fault conditions.

Features

* Adjustable set point
* Adjustable time delay
* LED trip indication
* 2 pole relay contacts
* Internal Differential (factory settable only)
* Auto Reset

Principle of Operation

The generator voltage provides the power supply for the relay energising circuit and phase reference for the phase sensitive detector. Current reference to the detector is taken from generator load current The output from the detector is compared with a reference which is set by the trip set point potentiometer. When the set point value is exceeded an electronic trip operator to energise the relay circuit though an adjustable time delay.

Product Details:

Principle of Operation
Up to six external RTD elements may be connected to the Hot Spot 6. The three wire connection method is recommended, particularly when copper RTDs are used. Each RTD forms one limb of a bridge circuit. A change in the resistance of the RTD element with temperature, unbalances the corresponding bridge, the resulting voltage being amplified by an operational amplifier. The output of each amplifier is compared, in individual comparator circuits, with a common voltage corresponding to the desired temperature trip level. All comparator outputs are applied to a relay driver via a six input OR gate, energising the output relay if the temperature of one or more of the RTD elements exceeds the desired trip level.The relay will also be energised if any of the six channels are open circuited.
Applications

• Motor protection
• Transformer protection
• Gensets protection
• Heating equipments protection and the protection against
• Ineffective cooling
• Blocked ventilation
• Overloads
• Worn bearings
• Locked rotor

Features

• Up to six RTD inputs
• Adjustable set point
• Internal differential
• LED trip indication
• Auto reset

Additional Information:

• Item Code: RELAY-HSR
• Port of Dispatch: BY ROAD
• Production Capacity: 100000
• Delivery Time: IMMEDIATELY

Product Details:

Product Details:

Product Details:

The protector operates by de - energizing a relay when the thermistors fitted into a motor stator detect a temperature condition. An illuminated green LED indicates critical when the temperature is within normal working limits.

ApplicationsThe Thermistor Trip Relay , when used in conjunction with positive temperature co-efficient thermistors, will help protect against

* Sustained overload
* Single phasing
* Locked rotor
* Blocked ventilation
* High ambient temperature


Features

* LED trip indication
* 2 pole relay contacts
* Energize/De-energize function swapping
* Auto / Manual Reset Priciple of operation The protector comprises a voltage level detector which detects the voltage across the thermistor. At normal temperature, when the thermistor resistance is low, a command signal energises a change - over relay and a green LED showing ‘safe’ condition. At a pre - determined temperature, the thermistor resistance increases rapidly, which de - energises the relay. The actual trip temperature is governed by the thermistor characteristic, which can be obtained from the manufactuer’s data. Failure of the supply to the unit or open circuit in thermistor winding will cause the relay to de-energise, thereby providing a failsafe facility.

The Synchro - check relay can be used to assist in the semiautomatic paralleling of two ac power systems.The Rishabh Paralleling protector provides manual / automatic switching of generator to busbar without damage or disturbance to the system.

Applications

* Co-generation
* Generator sets
* Gen-Bus synchronising
* Bus-Bus synchronising
* Assists in manual synchronising
* Monitors auto synchronising systems

Features

* LED trip indication
* Two pole relay contacts (optional)
* Adjustable synchronizing set points
* Live and Dead bus versions

Priciple of operationMODEL 256 - PLLThe relay continuously monitors the voltage, phase displacement and frequency of two supplies. A single set point adjustment permits selection of suitable matching and a red LED illuminates when the relay is energised, indicating that the two supplies are well matched and it is safe to close the breaker. MODEL 256 - PLDThis version operates in the same way as model 256-PLL but includes an additional dead bus detection function. If there is a requirement for a continuous supply or emergency power, then the generator can be connected without synchronising, thus ensuring continuity of supply. The absence of bus voltage will cause the relay to energise.The relay provides one pair of normally open and one pair of normally closed contacts. An LED indicates relay energised state. The synchronising set point limits are user adjustable.