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Minilec Motor and Pump Protection Relays

Minilec Motor and Pump Protection Relays Specification

Contact Form
SPDT

Contact Resistance
< 50 m

Contact Material
Ag Alloy

Coil Voltage
As per rated supply voltage

Ambient Temperature
-10C to +55C

Protect Feature
Phase Failure, Phase Sequence, Phase Unbalance, Under/Over Voltage, Dry Run protection

Working Temperature
-10C to +55C

Mechanical Life
>10 Million Operations

Coil Power
< 2.5 VA

Power Consumption
< 2.5 VA

Dielectiric Strength
2kV AC for 1 min

Product Type
Motor and Pump Protection Relay

Insulation Resistance
>20 M at 500V DC

Theory
Electromagnetic Relay

Usage
Motor & Pump Protection

Contact Load
5A @ 250V AC

Operate Time
Typically <100 ms

Terminal Type
Screw Terminals

Rated Voltage
220-240V AC/110-415V AC, 50/60Hz

Supply Terminal
L, N (Line, Neutral)

Size
Compact DIN Rail Mount

Color
Grey

Dimension (L*W*H)
Approx. 80 x 65 x 35 mm

Weight
Approx. 180-220 g

Reset Type
Automatic/Manual

Response Time
Instantaneous on Fault Detection

Enclosure Type
Flame Retardant ABS Plastic

Humidity Range
Up to 95% RH, Non-condensing

Short Circuit Protection
Yes, Up to Rated Load

Input Frequency
45-65 Hz

Standards Compliance
IS/IEC 60255

Mounting Type
DIN Rail or Surface Mount

Application
Suitable for Submersible, Monoblock & Openwell Pumps and Motors

Relay Output
1 Changeover (C/O) Contact

Display Indication
LED Indicators for Healthy, Fault & Trip Status

About Minilec Motor and Pump Protection Relays

Minilec Motor and Pump Protection Relays

OVERVIEW :-

	Sensing both voltage and current signals
	Phase Failure
	Unbalance
	Phase sequence
	Under over voltage
	Overloading and dry running
	Manual Reset
	Delayed auto reset
	Fixed trip settings
	Fixed overload characteristics
	2CO output relay

TECHNICAL SPECIFICATION:-

Supply Voltage

System	:	380-440V AC ± 20%, 48-63 Hz
Auxillary	:	220-240 ± 20% VAC

Output Relay Contact		:	2 CO

Input		:	-

Trip Setting
	Phase to phase unbalance	:	50% of Motor Current (Fixed)
	Under current (Dry running)	:	50% of set current (Fixed)
	Overload	:	As per inverse time characteristics
	UV/OV	:	UV = -20% (Fixed) OV = +20% (Fixed)

Trip Time Delay

	On phase failure	:	4 Sec ± 1%
	For overloading	:	As per Inverse Time Characteristics 2 Sec. (Fixed)
	UV/OV RP	:	For UV/OV - 4 Sec ± 1 Sec for RP - Instant

Resetting		:	Delayed Auto

Approx Weight		:	400 gms

Dimensions (mm)

Overall (L x W x D)	:	76 x 56.5 x 117.5
Mounting (L x W)	:	67 x 46 / 35 mm Rail Mounting

Note:

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

Selection Chart For CTS	Times full Load Current

CONNECTION DIAGRAM:-

Timing/ Relay logic Diagram	Electrical Connection Diagram

Relay contact position shown in 'Power off' condition

APPLICATION :-

Suitable for Panels in Following Apllications:

	Air -Conditioning & Refrigeration Machines
	Screw Compressors
	Lift , Elevators, Hoist & Cranes
	Crusher Motors , Mining M/c
	End Users

Advanced Fault Protection for Motors and Pumps

Minilec relays offer comprehensive protection against electrical anomalies such as phase failure, sequence issues, voltage fluctuations, and dry run conditions. The use of an electromagnetic relay and instantaneous fault detection ensures quick response, preventing equipment damage. LED indicators promptly display healthy, fault, or trip statuses, enabling operators to monitor system conditions at a glance.

Flexible Installation and Robust Design

Engineered for ease of mounting, these relays support both DIN rail and surface installation. The compact flame retardant ABS enclosure protects internal components, while the screw terminal interface simplifies wiring. With reliable mechanical life exceeding 10 million operations and high insulation resistance, the relay remains durable under demanding conditions.

User-Friendly Operation with Multiple Reset Options

Operators benefit from automatic and manual reset capabilities, streamlining maintenance and recovery processes. Power consumption remains low (<2.5 VA), and the relays design ensures safe operation with short circuit protection up to the rated load. The SPDT contacts made of Ag Alloy provide secure switching for motor and pump applications.

FAQs of Minilec Motor and Pump Protection Relays:

Q: How does the Minilec Motor and Pump Protection Relay detect and respond to faults?

A: The relay features instantaneous fault detection, operating in less than 100 ms for conditions such as phase failure, unbalance, incorrect sequence, voltage irregularities, and dry run situations. Upon fault detection, it triggers the relay output and activates corresponding LED indicators to help prevent equipment damage.

Q: What are the installation options and requirements for these protection relays?

A: These devices can be easily installed on either DIN rail or a flat surface. The compact enclosure and screw terminals facilitate a straightforward wiring process, fitting a wide range of motor control panels and pump systems.

Q: When should I choose the automatic versus manual reset feature on this relay?

A: Automatic reset is recommended for environments requiring minimal operator intervention and uninterrupted protection. Manual reset is preferable when fault conditions need inspection or confirmation before restoring operation.

Q: Where are these protection relays suitable for application?

A: Minilec relays are suitable for submersible, monoblock, and openwell pumps and motors. They are ideal for agricultural, municipal, and industrial water transfer applications, especially where reliable, fast fault response is essential.

Q: What benefits do the flame retardant ABS enclosure and compliance with IS/IEC 60255 offer?

A: The robust enclosure enhances protection against fire hazards and harsh environmental factors. Compliance with IS/IEC 60255 ensures the relays meet international standards for electrical and mechanical safety, performance, and reliability.

Q: How does the relay indicate system status to operators?

A: The relay uses LED indicators to clearly display the systems health (normal operation), fault (detection of abnormal conditions), and trip (device deactivation due to critical faults), enabling users to respond proactively.

Q: What is the maximum load capacity of the relay contacts, and what contact materials are used?

A: Relay contacts can handle up to 5A at 250V AC. The contact form is SPDT, made of silver alloy (Ag Alloy), with contact resistance less than 50 m, ensuring reliable conductivity and longevity.

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