MP-4000 motor relay

The MP-4000 motor relay is generally used on

a motor starter or a breaker used for a motor

load. The MP-4000 motor relay provides the

intelligence to protect and control the motor

against abnormal operating conditions. It monitors

the currents from either a 5A or a 1A secondary

of a CT circuit. Ground current may be obtained

from either a ground CT or from the residual

connection of the phase CTs. It provides a Form C

contact output for controlling the starter contacts

or breaker operation.The protection functions are listed below:

• I2t overload protection (49/51)

• Locked rotor (49S/51)

• Ultimate trip current (51)

• Current unbalance (46)

• Instantaneous overcurrent (50)

• Ground fault protection (50G)

• Undervoltage (27)

• Overvoltage (59)

• Under power (32)

• Voltage unbalance (47)

• Power factor (55)

• RTD trip and alarm with URTD module (49/38)

• Underload trip (37)

• Starts per time (66)

• Jam or stall (51R)

• Auto or manual reset (86)

• Fail-safe or non-fail-safe trip modes