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Minilec Phase Failure Relays VST D1

Minilec Phase Failure Relays VST D1 Specification

Contact Form
1 Change Over (1C/O)

Power Consumption
Approx. 3 VA

Protect Feature
Detects Phase Failure, Sequence, and Unbalance

Contact Material
Silver Alloy

Mechanical Life
10 Million Operations min.

Coil Power
3 VA

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

Ambient Temperature
-10C to +55C

Contact Resistance
<50 m at 1A 6V DC

Working Temperature
-10C to +55C

Dielectiric Strength
2 kV for 1 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

USB Ports
2

Smart TV Features
Built-in WiFi, Screen Mirroring

Viewing Angle
178

Refresh Rate
60 Hz

Sleep Timer
Yes

Remote Battery Type
AAA

Operating System
Android

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.

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