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For itto function, simply needs the current defined below flowing least one phase.12.2. self-supplied the current sensors installed the
circuit-breaker.1 rd
The PR121/P has been designed work accordance with the following international standard:
IEC 60947-2 voltage apparatus.2. SACE PR121/P Release Identification
The PR121/P units available, accordance with the IEC Standards, with the various default and optional protections and modules, are illustrated
in the figure below:
P /P
Protections u
Optional odules available
B -------------------------------------------------------------------------
PR030/B________________________
12..
12.
It should noted that the reference current for the PR121/P the (the rated current defined the Rating Plug) and not the (the uninterrupted
rated current the itself).3 max In
15 years 45°C
C haracteristics Relay Enabling
E1.
The characteristics the busbar current are given the table below:
50/60 ±10%
3000 max
6.5 mA.
The unit opens the circuit-breaker which installed means the TC, which takes effect directly the device's mechanical leverism.
31/158
.2.
A
Since the auxiliary voltage needs isolated from the ground, "galvanically separated converters" accordance with
the IEC standard 60950 (UL 1950) the equivalent IEC 60364-41 and CEI 64-8 have used guarantee rre in
com ode leakage current (as defined IEC 478/1 and CEI 22/3) greater than 3..
Example: the E1B800 with 400A Rating Plug has 800A and 400A. outside power source can, however,
be connected enable other functions and particularly for its connection the separate devices: HMI030 and PR021/K.2. Circuit-breakers.1 lf-su ply
The unit requires outside power source for the protection and alarm signal functions.2 Electrical characteristics
Rated operating frequency
Pass band
Peak factor
MTBF (MIL-HDBK-217E)
12.
Model 2234 Apparatus Scale
L 2778
Doc No- 2
Page No.2 uxiliary power supply
The outside auxiliary power supply provided using galvanically-separated power pack...
Depending the version, the protections available are follows:
S bol Protection against
L overload with inverse long time delay
S short-circuit with adjustable delay
I instantaneous short-circuit
G earth fault with adjustable delay
The PR121/P can installed 3-pole CBs with and without external neutral, 4-pole CBs.2 cifica tio s
12. The unit's protection parameters
and general operating mode can set entirely the user.
The unit made using digital microprocessor technology and interfaces with the user means DIP switches.E6
Three-phase minimum busbar current for enabling relay (LED alive and full relay operation) >70 >140 A
12.
12. The unit's user interface also enables parameter setup and complete pre-alarm and alarm management with
LED warning/alarm indicators for the protection and watchdog functions.E3 E4.2.2.1 eneral
The PR121/P unit high-performance self-supplied protection unit with Protection functions for the ABB SACE 'Emax' range 3-pole and 4-
pole low voltage air circuit-breakers
