M400-OA3 PHASE CURRENT RELAY
The M400-OA3 is an over current relay designed to
monitor current in each phase of a 3 phase system and provide a relay operation
when an over current conditions occur.
The M400-OA3 is housed in a
DIN standard 96 x 96 mm case which is front of panel mounting. This feature
provides major economic and safety benefits, when compared with the traditional
DIN rail mounted product. Any required readjustment or function checking, can
be achieved without the need to access the live side of the panel. The M400-OA3
also has the benefit over conventional current relays in that it indicates
which phase current has reached the trip level.
The
relay has customer adjustable current input settings from 2 to 6 Amps for each
phase and an adjustable time delay of 0-1 second. A manual push to "TEST"
button is provide for checking the relay operation.
The
status of the relay is always apparent from the front panel. A Red LED
indicates the state of the relay, a further 3 Red LED's are provided to
indicate which phase current has exceeded the pre-set level. The state of the
auxiliary power supply is indicated via a Green LED.
The
relay is latched so once the earth fault occurs the relay remains energised,
regardless of the condition of any of the individual 3 phase currents. The
relay can be rest via a reset button on the front of the M400-OA3 without
breaking the locking seal.
A lockable front cover is provided
to ensure that unauthorised personnel cannot tamper with the set point or time
delay of the Earth Fault Relay.
