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Minilec Phase Failure Relays S2 VMR3

Minilec Phase Failure Relays S2 VMR3 Specification

Working Temperature
-10C to +55C

Mechanical Life
1 million operations

Contact Form
SPDT (1 C/O)

Contact Resistance
< 50 m (initial)

Contact Material
Silver Alloy

Protect Feature
Phase failure, Phase sequence, Phase unbalance, Asymmetry, Under/Over voltage

Power Consumption
Less than 3 VA

Ambient Temperature
-10C to +55C

Coil Voltage
Operates on system voltage (415V AC)

Coil Power
Low power, integrated with relay

Dielectiric Strength
2 kV AC for 1 minute between input and output

Product Type
Phase Failure Relay

Insulation Resistance
> 100 M at 500V DC

Theory
Electromechanical relay

Usage
Protection of motors and equipment from phase failure, sequence, and unbalance

Contact Load
5A at 250V AC (Resistive Load)

Operate Time
1-2 sec (typically)

Terminal Type
Screw type terminals

Rated Voltage
415V AC (3 Phase, 4 Wire/3 Wire)

Supply Terminal
L1, L2, L3 (Phase to Neutral or Phase to Phase)

Size
Compact DIN rail mountable

Color
White and Blue

Dimension (L*W*H)
78 mm x 22.5 mm x 70 mm

Weight
Approx. 180 grams

Mounting Type
DIN rail mountable / Surface mounting possible with adaptor

Enclosure Material
Flame retardant plastic enclosure

Phase Sequence Protection
Yes

Storage Temperature
-20°C to +70°C

Response Time
< 2 seconds

Phase Asymmetry Setting
Adjustable, typically 40% phase unbalance threshold

Reset Type
Automatic reset

Relay Output Indication
LED indication for relay status

Compliance
IEC 60255, IS 3231

About Minilec Phase Failure Relays S2 VMR3

Minilec Phase Failure Relays

OVERVIEW :-

	Microcontroller design,
	SMD Technology,
	Absolute values of UV/OV settings,
	Phase Failure, Unbalance,
	Phase Sequence, under voltage,
	Over Voltage, Auto/Manual reset,
	Adjustable settings for Unbalance,
	UV/OV and trip delays,
	2 CO output relay

TECHNICAL SPECIFICATION :-

Supply Voltage

System	:	100-120 / 220-240 / 380-440V AC -25%+20%, 48-63 Hz
Auxillary	:	Built In (from 3 Phase)

Output Contacts		:	2 CO

Trip Setting(Volts)
	Phase Sequence	:	Yes
	Phase Unbalance	:	4 % - 20 % [Variable]

Under Voltage	For 380-440V AC For 220-240V AC For 100-120V AC	: : :	285-425V AC [Variable] 165-225V AC [Variable] 75-115V AC [Variable]
Over Voltage	For 380-440V AC For 220-240V AC For 100-120V AC	: : :	400-520V AC [Variable] 230-290V AC [Variable] 105-145V AC [Variable]

Trip Time Delay

	On Phase Sequence	:	Instant
	On SP/UV/OV	:	1 To 10 Sec [Variable)

Resetting Mode

Auto/ Manual Reset [Selectable]


Weight	:	110 gms.(Approx)

Dimensions (mm)

Overall (L x W x D)	:	90 X 35 X 60
Mounting (L x W)	:	35 mm Rail Mounting

Note:

Wherever not specified Contact Rating : 5A @ 230 V AC (resistive)

APPLICATION :-

Suitable for monitoring 3 Ph. System supply from MAINS & used by motor load -
	AC & R Chiller compressor motors.
	AHU Fan /Pump Motors
	Machinery using multiple small motors.
	MAIN powers supply distribution panel board.
	DG Set application
	UPS
	Submersible Pumps
	Hoist & Crane

Comprehensive Motor Protection

The S2 VMR3 phase failure relay offers robust defense against a wide array of electrical faults, including phase loss, incorrect sequence, over or under voltage, and significant phase unbalance. With an adjustable phase asymmetry setting (typically at 40%), it enables fine-tuned protection suited to diverse operational requirements, supporting the longevity and safety of your critical equipment.

Versatile and Easy Installation

Installation is streamlined thanks to its DIN rail mountable design, with surface mounting achievable via an additional adaptor. The compact dimensions and screw-type terminals facilitate quick electrical connections, making it suitable for both retrofits and new installations. Its user-friendly design helps reduce setup time, ensuring swift deployment in various electrical panels.

Rigorous Safety and Durability Standards

Built with flame retardant plastic, the relay endures high temperatures and harsh industrial settings. It boasts insulation resistance greater than 100 M at 500V DC and dielectric strength of 2 kV AC, ensuring reliable operation and long service life. Compliance with international standards (IEC 60255, IS 3231) affirms its suitability for demanding applications across multiple sectors in India.

FAQs of Minilec Phase Failure Relays S2 VMR3:

Q: How does the S2 VMR3 Phase Failure Relay protect motors and equipment?

A: The S2 VMR3 monitors three-phase supply for faults such as phase failure, incorrect phase sequence, unbalanced voltage, and under or over voltage. Upon detection, the relay de-energizes its output within 12 seconds (typically <2 seconds), promptly isolating the equipment to prevent damage.

Q: What are the mounting options for this relay, and where can it be installed?

A: The relay is DIN rail mountable for easy integration into standard control panels. If surface mounting is preferred, an adaptor allows for direct enclosure installation, making it suitable for industrial and commercial electrical panels.

Q: When does the relay reset after a fault condition?

A: The relay features automatic reset. Once the detected electrical fault is cleared and the phase conditions return to normal, the relay resets itself without manual intervention, ensuring seamless operation.

Q: What is the process for adjusting the phase asymmetry/unbalance setting?

A: The S2 VMR3 offers an adjustable phase asymmetry threshold, typically set at 40%. Users can fine-tune this setting according to site requirements, usually by accessing a dedicated adjustment dial or screw on the relay unit.

Q: How does the LED relay output indication work?

A: An LED on the front panel offers visual confirmation of the relay status. It illuminates when the relay is energized (healthy condition), assisting with quick fault identification and operational status at a glance.

Q: What are the main benefits of using this relay in your system?

A: Using the S2 VMR3 enhances equipment safety by preventing costly breakdowns due to electrical faults, increases system reliability with fast response time and automatic reset, and reduces maintenance intervention. Its compliance with key standards ensures trust and suitability for industrial use.

Q: Where is the S2 VMR3 suitable for use in India?

A: This relay is ideal for motor control centers, distribution boards, pump houses, HVAC units, or any application requiring continuous protection of three-phase equipment across Indias diverse industrial environments.

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