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Electrical Relays

Wholesale Trader of a wide range of products which include earth fault relay, bender rcm420 residual current monitor and vmd423 / vmd423h voltage and frequency monitor.

Earth Fault Relay

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Earth Fault Relay
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Product Details:
Accuracy+/- 2% of the time
DC Voltage12 or 24 VDC (+/- 25%)
AC Voltage110 or 240 or 415 VAC (+/- 25%)
Relay Contact Rating6 Amps resistive load or 2 Amps inductive load at 230 VAC/440 VAC or 24 VDC
Dimensions105 x 51 x 102 mm
Voltage Supply5 VA (Max.)
Current Supply1 VA (Max.)

It is a small and compact unit based on latest electronic devices. It senses the current flowing through a totally electrically isolated circuit and energises the electromagnetic relay when the current crosses the set value. The current setting is done with a continuously adjustable knob over a linearly calibrated dial. It incorporates a built-in ON delay timerto avoid spurious trappings in case of transients with time adjustable from 1 to 10 seconds the help of a second knob over a calibrated dial. Two change over contacts of the delay are provided for the customer's usage. Three LED's (light emitting diodes) are provided on top of the unit to indicate voltage supply ON, relay ON status and Time ON.


Features:
  • Completely isolated circuit from mains.
  • On delay timer provided for protection against transients.
  • Both Auto & Manual Reset Models available.
  • Positive Action without Chattering.
  • Consistent Accuracy & Reliability.
  • Life time guarantee of the unit (conditions apply).

Current Setting Range:
  • 1 to 5 amps AC (for higher current suitable CT's should be used)
  • Max capacity of the current sensor is 10 amps.

Insulation: The unit will withstand 2.5 KV 50 Hz for one minute between all external A.C. supply termina's and relay contacts connected together and body.
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Bender RCM420 Residual Current Monitor

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Bender RCM420 Residual Current Monitor
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Product Details:
BrandBender
Model Name/NumberRCM420
WeightLess than or equal to 150 G
Measured Value16 A
Opening Force50 N
Stripping Length10 mm
Operating Temperature-25 to +55 Deg.C
Rated operational voltage230 V
Response Range10 mA to 10 A
Frequency Range42-2000 Hz

The AC and pulsed DC sensitive residual current monitor RCM420-D (Type A) from Bender is designed for fault and residual current monitoring in earthed power supply systems (TN and TT systems) where an alarm is to be activated in the event of a fault, but disconnection must be prevented. In addition, the device can be used to monitor single conductors, such as PE conductors, N-PE connections and PE-PAS connections.The prewarning stage (50...100 % of the set response value IΔn2) allow to distinguish between prewarning and alarm. Since the values are measured with measuring current trans-formers, the device is nearly independent of the load current and the nominal voltage of the system.


Features:

  • AC and pulsed DC sensitive residual current monitor Type A according to IEC 6202
  • r.m.s. value measurement (AC)
  • Two separately adjustable response values
  • Frequency range 42…2000 Hz
  • Start-up delay, response delay and delay on release
  • Restart function
  • Digital measured value display via LC display
  • Measured value memory for operating value
  • CT connection monitoring
  • LEDs: Power On, Alarm 1, Alarm 2
  • Internal/external test/reset button
  • Two separate alarm relays
  • (one changeover contact each)
  • N/O or N/C operation and fault memory behaviour selectable
  • Password protection for device setting
  • Device self monitoring
  • Sealable transparent cover
  • Two-module enclosure (36 mm)
  • RoHS compliant
  • Push-wire terminal (two terminals per connection)

Applications:
  • Residual current monitoring in earthed two, three or four conductor systems
  • Current monitoring of single conductors de-energised under normal conditions
  • Socket-outlet circuits for devices which are operated unattended for a long time and which may not fail
  • Alarm systems, safety devices
  • Air conditioning systems, EDP systems
  • Cooling equipment with valuable frozen goods
  • Canteen kitchens
  • Monitoring of earthed power supplies for stray currents
  • Impact on N conductors
  • Trace heating systems
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VMD423 / VMD423H Voltage and Frequency Monitor

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VMD423 / VMD423H Voltage and Frequency Monitor
  • VMD423 / VMD423H Voltage and Frequency Monitor
  • VMD423 / VMD423H Voltage and Frequency Monitor
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Product Details:
BrandBender
Model Name/NumberVMD423 / VMD423H
DisplayLCD
WeightLess than or equal to 150 g and 240 g
Operating temperature-25 to + 55 Deg C
IP RatingIP30,IP20
Rated operational current5 A
Test Opening Diameter2.1 mm
Stripping Length10 mm
Opening Force50 N

According to DIN V VDE V 0126-1-1, the voltage and frequency shall be monitored when feeding power into the public low voltage grid from private electricity generation systems > 30 kW (such as CHPs, wind power stations, hydroelectric power plants and photovoltaic systems).


The three-phase VMD423 series voltage and frequency monitors monitor the voltage and frequency at the feeding point of the public grid. At the feeding point of the medium voltage grid, the output voltages and frequencies are measured by means of voltage transformers (100 V). An alarm relay is activated within ≤ 80 ms when limit values are reached (response values according to VDEW guideline “Private electricity generation systems at the medium voltage grid”). An overvoltage (> U2), measured as average value over a 10-minute period, will cause the alarm relay to switch.


The voltages are measured as r.m.s. values. In addition asymmetry, phase failure and phase sequence are monitored.


The VMD423 is suitable for multifunctional monitoring tasks and can be adapted to the requirements of the electricity supply companies.


The currently measured values are continuously shown on the LC display. The measured value causing the alarm relay to switch is saved. Due to adjustable start-up delay and delay on release, the network operator's specific requirements can be considered such as device-specific start-up procedures, short-time voltage fluctuations etc.

The VMD423 series requires a separate supply voltage, whereas the VMD423H version draws its supplies from the system.


Device Features:

  • VMD423 with separate supply voltage
  • VMD423H is supplied by the system being monitored
  • Undervoltage, overvoltage and under-frequency and overfrequency monitoring in 3(N)AC systems AC 0...500 V
  • Monitoring of overvoltage by average determination of the latest 10-minute measuring interval
  • Asymmetry, phase failure and phase sequence monitoring
  • Start-up delay, response delay and delay on release
  • Adjustable switching hysteresis
  • r.m.s. value measurement (AC+DC)
  • Digital measured value display via multi-functional LC display
  • LEDs: Power On, Alarm 1, Alarm 2
  • Measured value memory for operating value
  • Cyclical self monitoring
  • Internal test/reset button
  • Two separate alarm relays (one changeover contact each)
  • N/C or N/O operation and fault memory behaviour selectable
  • Password protection for device settings
  • Sealable transparent cover
  • Push-wire terminal (two terminals per connection)
  • Two-module enclosure (36 mm)
  • RoHS compliant

 

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