ALSTOM Definite Time Delay Relay VTT11ZG8023LCH

ALSTOM Definite Time Delay Relay VTT11ZG8023LCH
? Type: Electro Mechanical Relay
? Protection Type: Definite Time Delay Relay
VTT11ZG8023LCH
STATIC DEF TIME DELAY RELAY WITH DELAY O
Technical Specifications
Model No : VTT11ZG8023LCH
VTT11
APPLICATION – PICK UP
AUX. CURRENT OR VOLTAGE – 220 – 250V AC
CASE SIZE – 1/2N H 12T
CONTACTS (S/R OR H/R) – 2 N/O 2 N/C S/R
FLAG – YES
MOUNTING – FLUSH
TIME DELAY P/U OR D/O – 0.5 – 5 SECS.
External Resistor
Name Plate RZF9066-601
Outline Diagram MFM017
Wiring Diagram MZDZ601.02-2

VTT is a static time delay relay which is particularly suitable for applications requiring large number of operations and consistent accuracy with little or no maintenance over long periods. It is also commonly used in industrial
processes.

Features
? Consistent accuracy
? Reliability
? Low burden
? Reduced maintenance
? Immunity to transients and surges; withstands 5 kv impulse voltage test
? Relays with heavy-duty magnetic blow-out contacts also available

Type VTT 11 units have a delayed pickup, i.e., timing is started by closing an initiating contact and the output relay is energised at the end of the set time. The unit resets when the initiating contact is reopened.

Type VTT 12 units have a delayed dropoff, i.e., the output relay is normally energised. Timing is started by opening
an initiating contact and the output relay is de-energised at the end of the set time. The unit resets when the initiating contact is reclosed.

A stabilised voltage is applied to a resistance/capacitance circuit. The potential developed across the capacitor
is applied to a transistor switching circuit which, in turn, operates an attracted armature relay when the potential
reaches the trigger level.

The time delay is varied by altering the resistance value in the resistance/ capacitance circuit by a potentiometer
calibrated in seconds. A circuit is incorporated to protect the transistors from damage due to high peak transients
in the supply voltage. A diode is also fitted in the circuitry to take care of inadvertent connection of supply with reversed polarity.

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