Model
Motor / Pump Protection Relays
Single Phase Pump Protection Relay
Three Phase Motor/Pump Protection Relay
Current Sensor Suitable for MPR
Microprocessor Based Motor Protection Relay
Winding Temperature Relay
Bearing Temperature Relay
Motor / Pump protection Relays
Motor / Pump Protection Relays
These relays are useful for protection of 1 Ph. / 3 Ph. AC induction motors against various hazards. With their unique advantages they eliminate use of a Thermal / Bimetallic relay for motor protection. Being current sensing, they are to be selected according to motor rating and are available for practically all ranges of motors. These relays are ideally suitable for Air-conditioning Compressor motor protection, as also for motors in machines, conveyors, cranes / hoists and lifts and for pumps.
FEATURES
- Fixed/Adjustable Under/Over Trip settings
- Fixed/Adjustable Trip delays and Power On delays
- Resetting – Auto or Manual or Remote
- Output contacts : 1 CO or 2 CO
- Choice of Enclosures (DIN-Rail, Flush)
- Models with Micro-Controller based design
- 2 line Alpha-Numeric LCD display (for F3/D3/D5 models)
- Use of SMD Technology
- User friendly LED indications
PROTECTIONS / FUNCTIONS
- Phase Failure [Phase Loss/Single Phasing]
- Phase Sequence Reversal
- Voltage Unbalance
- Under Voltage, Over Voltage
- Overload Protection as per IDMTL Characteristics
- No-Load/Dry Running
- Motor Winding Overheating
- Over Current/Short Circuit/Locked Rotor
- Earth Fault
ORDERING INSTRUCTIONS
- Product Family Name
- Model Name
- Aux. Supply / Control supply voltage & Friquncy
- Motor/Pump Rating (HP/KW) & Duty
- Overload Characteristics Required
- No. of PTCs & Temp. graph
CBCT INSTRUCTIONS
- Primary & Secondary Current.
- Inner Diameter.
- Outer Diameter.
- Minilec Relay Model Name.
FAQs
Minilec offers range of protection relays as:
Overload Protection: Protects against excessive current draw as per the motor’s specific characteristics.
Phase Failure (Single Phasing): Detects loss of one phase.
Phase Reversal: Detects incorrect phase sequence and prevents reverse rotation.
Voltage Unbalance: Protects against damage caused by uneven voltage supply.
Under Voltage & Over Voltage: Guards against supply voltage outside safe operating limits.
No-Load / Dry Running: Prevents pump damage by detecting when it is running without fluid.
Locked Rotor / Short Circuit: Provides instant protection against motor stall and severe over-current.
Earth Fault: Detects current leakage to earth (requires an external CBCT).
Motor Winding Overheating: Monitors direct motor temperature via PTC thermistor sensors.
You need to specify:
- Primary & Secondary Current ratings.
- Inner Diameter (to ensure your power cables can fit through it).
- Outer Diameter.
- The specific Minilec relay model name it will be connected to.
Auto Reset: The relay will automatically attempt to reset itself and restart the motor after the fault condition clears and a pre-set time delay elapses.
Manual Reset: After a fault, the relay remains tripped until an operator physically presses a reset button. This is a critical safety feature to ensure the fault is investigated before restarting.
- Comprehensive Protection: A single device replaces multiple simpler devices.
- Precision: Microcontroller-based design and digital settings offer more accuracy than electromechanical relays.
- Prevents Downtime: Protects expensive motors and pumps from catastrophic failure.
- Flexibility: Adjustable trip settings and delays allow customization for specific applications.
- Diagnostic Info: Models with LCD displays provide valuable information on the fault cause.
