08045803208

GST : 27AABPJ8217B1Z4

Our Products

Minilec

Selec Process Instruments

PLA Products

Wago Products

Minilec Phase Failure Relays

Minilec Current Monitoring Relays

Minilec Voltage Monitoring Relays

Minilec Motor Protection Relay

Minilec Ground Fault Monitoring Relays

Minilec Frequency Monitoring Relays

Minilec Power Monitoring Relays

Minilec Voltage Scanners and Controllers

Minilec Motor Protection Relays

Minilec Microprocessor Pump Automation System

Minilec Temperature Protection Relay

Minilec Electronic Delay Timers

Minilec Liquid Level Controllers

Minilec Soft Starters

Minilec Alarm Annunciators

Minilec Agri Sector Products

Minilec Power Line Transducers

Minilec Phase Failure Relays VST D1

Minilec Phase Failure Relays VST D1 Specification

Working Temperature
-10C to +55C

Coil Power
3 VA

Contact Resistance
<50 m at 1A 6V DC

Protect Feature
Detects Phase Failure, Sequence, and Unbalance

Contact Material
Silver Alloy

Contact Form
1 Change Over (1C/O)

Dielectiric Strength
2 kV for 1 Min

Coil Voltage
415V AC (Built-in for Three Phase)

Ambient Temperature
-10C to +55C

Power Consumption
Approx. 3 VA

Mechanical Life
10 Million Operations min.

Product Type
Phase Failure Relay

Insulation Resistance
>100 M at 500V DC

Theory
Electromagnetic Relay

Usage
Phase Failure/Sequence Protection

Contact Load
5A at 250V AC (Resistive)

Operate Time
1.5 sec (Max)

Terminal Type
Screw Terminals

Rated Voltage
415V AC

Supply Terminal
L1, L2, L3 (Three Phase)

Size
Standard

Color
Off White / Grey

Dimension (L*W*H)
22.5 x 77.5 x 110 mm

Weight
Approx. 140 g

Mounting Type
DIN Rail Mountable

Phase Unbalance Trip Level
30% ±5%

Frequency Range
50/60 Hz

Reset Mode
Automatic

Phase Sequence Indication
Provided

Response Time
<200 ms (Releasing)

Output Indication
LED Status Indicator

Enclosure Material
Flame Retardant ABS Plastic

About Minilec Phase Failure Relays VST D1

Minilec Phase Failure Relays

OVERVIEW :-

Phase Failure, Phase Sequence,

Under voltage, Auto Reset,

Adjustable trip delay,

1 CO output relay

Selectable range of supply voltage

TECHNICAL SPECIFICATION :-

Supply Voltage

System	:	240 / 415 / 575 V AC 3 Phase (±15% selectable)
Auxillary	:	Built In

Output Contacts		:	1 CO

Trip Setting(Volts)
	Phase Sequence	:	Yes
	Phase Unbalance	:	NA

Under Voltage	For 380-440V AC For 220-240V AC For 100-120V AC	: : :	80% of V set 80% of V set 80% of V set
Over Voltage	For 380-440V AC For 220-240V AC For 100-120V AC	: : :	NA NA NA

Trip Time Delay

	On Phase Failure	:	0.2 - 10 secs. (variable)
	On UV/OV	:	0.2 - 10 secs. (same for UV & SP)

Resetting Mode

Auto


Weight	:	300 gms.

Dimensions (mm)

	Overall (L x W x D)	:	76 x 30.5 x 117.5
	Mounting (L x W)	:	68 centre to centre / 35 mm rail Mounting

Note:

	Wherever not specified Contact Rating : 5A @ 230 V AC (resistive)
	* CE marked products available on request.

APPLICATION

Suitable for Various equipment's using 3Phase System supply voltages like 230 V, 415 V, 440 V, 500 V, and 575 V AC.
Examples-

Mining equipment & Machines.

3 Ph. Motors for Mining equipment.

Compressor Motors for drilling equipment.

VST D1 VST D1

Efficient Three-Phase Protection

Protect your electrical equipment from operational disturbances with the VST D1 relay. It diagnoses phase failure, incorrect phase sequence, and unbalanced voltage rapidly, ensuring continuity and safety. This makes it an indispensable component for industrial and commercial installations reliant on stable power supplies.

Automatic Reset and Quick Response

The relay offers a swift response, releasing in under 200 ms and operating within 1.5 seconds, automatically resetting after the fault is cleared. This minimizes downtime and ensures constant monitoring without manual intervention, maintaining operational efficiency.

Durable Construction and Easy Installation

Built with flame-retardant ABS plastic, the VST D1 withstands harsh environments and high mechanical stress. DIN rail mounting and screw terminals simplify installation, making it suitable for both new panels and retrofit projects. The compact design ensures hassle-free integration into standard electrical enclosures.

FAQs of Minilec Phase Failure Relays VST D1:

Q: How does the Minilec Phase Failure Relay VST D1 indicate a phase fault?

A: The relay uses a LED status indicator to provide clear visual feedback when a phase failure, sequence error, or voltage unbalance is detected.

Q: What is the process for installing the VST D1 relay?

A: The relay is DIN rail mountable and features screw terminals for secure electrical connections. Simply mount it to the DIN rail and connect supply terminals L1, L2, and L3 as per standard wiring practices.

Q: When does the VST D1 trip for phase unbalance?

A: The relay trips when it detects a phase unbalance of 30% 5%, helping protect devices from issues caused by uneven voltage distribution.

Q: Where can the Minilec VST D1 be used?

A: It is suitable for phase failure and sequence protection in industrial, commercial, and critical infrastructure environments using three-phase electrical networks.

Q: What benefits does automatic reset provide in this relay?

A: The automatic reset feature ensures that the relay resumes normal operation once the fault has been cleared, eliminating the need for manual intervention and reducing downtime.

Q: How does the relays enclosure enhance safety?

A: The enclosure is made of flame-retardant ABS plastic, which minimizes fire risks and provides robust physical protection for internal components.

Q: What advantage does swift response time offer?

A: A quick response time (<200 ms for releasing) helps prevent equipment damage by immediately isolating faulty phases, supporting safe and reliable system operation.

Get Latest Price