FEATURES

• No effect of transients.

• Positive action without chattering.

• Consistent accuracy and reliability.

• Life time guarantee of the unit (conditions apply).

TWO MODELS

• Over frequency relay ( on delay timer)

• Under frequency relay ( Off delay timer)

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DESCRIPTION

This is a  compact micro-electronic device based on latest technology used for under and over frequency protection. This has two continuously adjustable knobs over a calibrated dial for frequency and time delay settings. Three LED's are provided to indicate timer 'ON', voltage supply 'ON' and relay 'ON' status. The frequency of the voltage supply is sensed by electronic filters and if found above the set value, an electromagnetic relay is energised. Over frequency operation can also be used for over speed protection in diesel generating sets. Two

potential-free change over contacts of the relay are provided for customer's usage.
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Frequency Setting Range

Setting Accuracy

± 05. Hz

Repeat Accuracy

± 0.5% of the set value

Working Voltage

(± 25% variation is acceptable)

110, 240 or 415 VAC

Reset

The unit gets reset automatically, once the frequency of the voltage supply recovers, in case of auto-reset. In case of manual reset, the units is rest by disconnecting the voltage supply to the unit for a short duration.

Burden

10 VA (maximum)

Relay Contact Rating

6 Amp resistive load or 2 AMPS inductive load at 230 VAC/440 VAC or 24 VDC.

Dimensions

Base........70 x 127 mm, Height ...... 117 mm.