MRM3-2IE Motor protection (MRM32I5E5DM)
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Configuration
The motor protection relay MRM3-2 offers reliable protection for LV and MV motors which are either operated via power contactors or power circuit breakers.
The following functions are integrated into this relay:
Overload protection acc. to IEC 255-8 in consideration of the initial load factor (thermal image)
Definite undercurrent protection
Definite time over current protection (DMT)
Inverse time over current protection (IMT) with select-able trip characteristics
Short-circuit protection
Load unbalance supervision with definite or inverse trip characteristics
Earth-fault detection with suppression of harmonics
The MRM3-2 recognizes the “Start-Up“ and “Motor Running“ phase. Motors with a limited number of starts can be controlled by the start limiting function of the relay.
The earth-fault supervision is either realized in Holm-green connection or by means of a core-type current transformer.
The motor can be stopped in delayed or undelayed mode via digital inputs.
19“ racks – fully withdrawable
Door mounting – withdrawable and sealable
Panel mounting – fully withdrawable
Fault / disturbance recorder
Intuitive HMI
Display (of primary values)
Easy setting software – Smart view
Compact form factor
Start Cycle Supervision
Overload
Jam / Locked Rotor
Underload
Unbalanced Load
Number of Starts, Counters,…
Keeping motor load under the Thermal Damage Curve