Emax UL
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L2275
Doc. N°
Mod.
RH0109002
Apparatus
Scale
Page N°
Fig. 34e
Mechanical connections
Electrical connections
11.
Trip units – General notes
The SACE Emax series power circuit breakers can be equipped with SACE PR111, PR112 or PR113 electronic trip units.
The SACE PR111 trip units carry out the protection function and local and test signaling.
Apart from the functions of the PR111 which can be carried out with a wider range of possibilities, the SACE PR112 and PR113 trip units in the
configuration fitted with the protection unit only (PR112/P-A, PR113/P-A), also carry out the functions of remote Watchdog signals and measurement.
Both the trip units normally receive their power supply from the current transformers mounted in each pole. All the adjustment and control parts
available to the user are arranged on the front of the trip unit.
Their installation in the power circuit breaker is simple: the mechanical fixing is carried out by means of four nuts, whereas some connectors are
available for the electrical connections, whose references are indicated on the electrical circuit diagram.
XK1:
connector for connection of the PR111, PR112/P and PR113/P trip units to the current sensors
XK2 e XK3: connectors for the auxiliary circuits of the PR112/P and PR113/P trip units (for functions such as remote signals and circuits for zone
selectivity)
X0:
connector for the Y01 shunt trip which makes the power circuit breaker open following intervention of the trip unit.
Accessory units normally provided, and others supplied on request, allow the auxiliary power supply and tests to check functionality of the trip
unit.
