3
Motor Protection Relay REM 610
Features • Three-phase thermal overload protection
• Three-phase motor start-up supervision
based on thermal stress calculation with
speed switch blocking ability
• Three-phase overcurrent protection with
definite-time characteristic and speed
switch blocking ability
• Three-phase short-circuit protection with
instantaneous or definite-time characteris-
tic
• Three-phase undercurrent (loss of load)
protection with definite-time characteristic
• Non-directional earth-fault protection with
definite-time characteristic
• Three-phase unbalance protection based
on the negative-phase-sequence current
with inverse definite minimum time charac-
teristic
• Phase reversal protection based on the
negative-phase-sequence current
• Cumulative start-up time counter with
restart inhibit function
• Circuit-breaker failure protection
• Temperature protection stages with defi-
nite-time characteristic
• Emergency start function
• Optional RTD module
- with six measuring inputs
- supports PTC thermistors and various
RTD sensors
- three additional galvanically isolated
digital inputs
• Disturbance recorder
- recording time up to 80 seconds
- triggering by one or several internal or
digital input signals
- records four analogue channels and up
to eight user-selectable digital channels
- adjustable sampling rate
• Time synchronization via a digital input
• Non-volatile memory for
- up to 100 event codes with time stamp
- setting values
- disturbance recorder data
- recorded data of the five last events with
time stamp
- number of starts for protection stages
- operation indication messages and
LEDs showing the status at the moment
of power failure
• Battery back-up for real-time clock
• Battery charge supervision
• Four accurate current inputs
• Two galvanically isolated digital inputs and
three additional digital inputs on the
optional RTD module
• Time synchronization via a digital input
• All settings can be modified with a PC
• HMI with an alphanumeric LCD and
manoeuvring buttons
- eight programmable LEDs
• Detachable plug-in unit
• Three normally open power output contacts
• Trip-circuit supervision
• Two change-over signal output contacts
• Output contact functions freely config-
urable for desired operation
• Optical front communication connection:
wirelessly or via cable
• Optional rear communication module with
plastic fibre-optic, combined fibre-optic
(plastic and glass) or RS-485 connection
for system communication using the SPA-
bus, IEC 60870-5-103 or Modbus (RTU
and ASCII) communication protocol
• Continuous self-supervision of electronics
and software. At an internal relay fault, all
protection stages and outputs will be
blocked.
• User-selectable rated frequency 50/60 Hz
• User-selectable password protection for
the HMI
• Display of primary current values
• Demand values
• Multi-language support
1MRS 755121
Issued: 01.12.2003
Status: Updated
Version: C/08.03.2005
Data subject to change without notice
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