The compact EMR4-F phase sequence
relay can be used for monitoring the clockwise rotation of
movable motors where the phase sequence is important, as
related to pumps, saws, and drilling. It provides protection
against damage by means of phase sequence and phase failure
The EMR4-W phase Measuring Relay
is optimal for monitoring the phase sequence and the applied
voltage level, subsequently offering protection against
destruction or damage to individual system sections.
A dial allows setting of the
required voltage for both the minimum undervoltage and
maximum overvoltage within a defined window.
Both on-delayed and
off-delayed functions are available. The on-delayed
setting enables short overvoltages or voltage dips to be
bridged. The off-delay setting allows faults to be
stored for the time set.
The delay time can be set
between 0.1s and 10s. The relay picks up if the phase
sequence and voltage are correct. After it has dropped
out the device does not pick up again until the voltage
goes over a 5% hysteresis.
The EMR4-A phase imbalance Measuring Relay module is the
ideal protective device for phase loss protection. The
detection of phase loss on the basis of phase shift means
that reliable phase loss detection is ensured, even with
large amounts of energy regenerated to the motor (up to 95%
EMR4-R insulation Moeller
Measuring Relays increase operation safety and reliability.
IEC/EN 60 204 "Safety of Machinery" stipulates that
auxiliary circuits must be protected with earth leakage
monitors in order to increase operating safety. This
Measuring Relay is primarily used for this purpose, as well
in areas for medical applications with similar requirements.
A changeover contact indicates
an earth fault and therefore allows faults to be
rectified without the need for expensive downtimes.
The devices can be provided
with an optional fault memory that requires a fault to
be acknowledged after it has been rectified.
A test button is provided to
test the functioning of the device at any time.
The EMR4-I current monitors are suitable for both AC and
DC monitoring tasks. The selectable lower or upper tripping
limit means that they can be used for the underload or
overload monitoring of pumps and drilling machines.
They are available in two
versions, each with three measuring ranges (30/100/1000
mA, 1.5/5/15 A).
The multi-voltage coil allows
these relays to be used for a wide range of
The EMR4-N level Moeller Measuring Relays are used primarily
to protect pumps from running dry or for the control of
liquid levels. They operate by means of sensor monitoring
the maximum level and one sensor monitoring the minimum. A
third sensor is used for the chassis potential.
The EMR4-N500 level Measuring Relay
has an enhanced sensitivity and is therefore also good for
less conductive media, such as foams. An integrated on and
off-delay function between 0.1s and 10s ensures that even
moving liquids can be monitored reliably.