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Minilec Motor and Pump Protection Relays S2 CMR1

Minilec Motor and Pump Protection Relays S2 CMR1 Specification

Ambient Temperature
-10C to +55C

Contact Material
Silver Alloy

Dielectiric Strength
2.0 kV AC for 1 minute

Contact Resistance
< 50 m

Contact Form
1 C/O (SPDT)

Power Consumption
<3VA

Mechanical Life
>10 operations

Working Temperature
-10C to +55C

Coil Voltage
230V/415V AC (as per model)

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

Coil Power
<1.5W

Product Type
Motor & Pump Protection Relay

Insulation Resistance
>= 100 M at 500V DC

Theory
Electronic Monitoring Relay

Usage
Motor and pump protection in industrial panels

Contact Load
5A at 250V AC (Resistive)

Operate Time
<2 sec (Typically)

Terminal Type
Screw type

Rated Voltage
230V AC, 415V AC (Selectable)

Supply Terminal
L-N / R-Y (as per model)

Size
Standard DIN Rail Mount size

Color
Grey

Dimension (L*W*H)
82 x 36 x 110 mm (Approx.)

Weight
Approx. 200 g

Indication
LED status indications for Power, Trip and Fault

Model Number
S2 CMR1

Enclosure Material
Flame Retardant ABS Plastic

Response Time
<200 ms

Mounting Type
DIN Rail Mounting

Humidity
Up to 95% non-condensing

Reset Mode
Automatic/Manual selectable

Standards
Complies with IEC 60255

About Minilec Motor and Pump Protection Relays S2 CMR1

Minilec Motor and Pump Protection Relays

OVERVIEW :-

	Phase Failure
	Unbalance
	Phase sequence
	Overloading and dry running (Under current) Microcontroller based design
	SMD technology
	Auto/Manual Reset
	Adjustable current trip settings
	Selectable overload characteristics
	2 CO output relay

TECHNICAL SPECIFICATION:-

Supply Voltage

System	:	100-120/220-240/380-440V AC ± 20%, 48-63 Hz
Auxillary	:	100-120/220-240VAC±20%, 24V DC+10%-15%

Output Relay Contact		:	2 CO

Input		:	-

Trip Setting
	Phase to phase unbalance	:	50% of Motor Current (Fixed)
	Under current (Dry running)	:	40% to 80% of set current
	Overload	:	As per inverse time characteristics
	UV/OV	:	N.A.

Trip Time Delay

	On phase failure	:	4 Sec ± 1 Sec (Fixed)
	For overloading	:	As per Inverse Time Characteristics 2/5/10 Sec. (Selectable)
	UV/OV RP	:	N.A.

Resetting		:	Auto / Manual

Approx Weight		:	140 gms

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)

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

Versatile Motor and Pump Protection

Minilec S2 CMR1 provides precise protection against multiple electrical faults such as phase failure, phase sequence errors, voltage fluctuations, and dry run conditions. Its advanced electronic monitoring safeguards pumps and motors, helping reduce downtime and minimizing the risk of equipment damage.

Reliable and Fast Operation

With a response time of less than 200 ms and operate time of under 2 seconds, this relay ensures swift interruption upon detecting abnormalities. The robust design endures high humidity and temperature changes, while LED indicators provide clear status updates for instant diagnostics.

User-Friendly Design

Mounted quickly on a standard DIN rail, the S2 CMR1 features screw-type terminals for secure connections. Users can select between automatic and manual reset modes, adapting to diverse industrial requirements. The enclosure made with flame retardant ABS plastic further enhances safety and longevity.

FAQs of Minilec Motor and Pump Protection Relays S2 CMR1:

Q: How is the Minilec S2 CMR1 installed in control panels?

A: The S2 CMR1 is designed for DIN Rail mounting, making it easy to install in standard control panels. Simply secure it using the rail and connect the wiring through its screw-type terminals as per the manufacturers instructions.

Q: What indications are provided by the S2 CMR1 relay during operation?

A: The relay features LED indications for Power, Trip, and Fault, allowing quick visual monitoring of operating status and immediate identification of any abnormal conditions affecting the motor or pump.

Q: When should the reset mode be chosen as automatic or manual?

A: Automatic reset is suitable for non-critical applications where equipment can safely restart after a fault is cleared. Manual reset is recommended when operators need to inspect the system before resuming operation, adding an extra layer of safety.

Q: Where is the S2 CMR1 relay most commonly used?

A: It is typically used in industrial motor and pump control panels for protection against electrical and mechanical faults. Its compatibility with standard DIN rail setups makes it ideal for a wide range of industries such as water treatment, manufacturing, and HVAC systems.

Q: What types of protection features does the S2 CMR1 offer for motors and pumps?

A: The S2 CMR1 safeguards motors and pumps against phase failure, phase sequence errors, phase unbalance, over/under voltage, and dry run situations, thereby preventing costly damage and extending equipment life.

Q: How does compliance with IEC 60255 benefit users of S2 CMR1?

A: Adhering to the IEC 60255 standard ensures reliable, high-quality performance and international safety benchmarks, giving users confidence in both the devices durability and operational consistency.

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