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The unit made using digital microprocessor technology and interfaces with the user means DIP switches..5 mA.1 rd
The PR121/P has been designed work accordance with the following international standard:
IEC 60947-2 voltage apparatus.12.1 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.
Model 2234 Apparatus Scale
L 2778
Doc No- 2
Page No..
12.2 cifica tio s
12.2. 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________________________
12.2.
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).E3 E4. self-supplied the current sensors installed the
circuit-breaker.2.
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 Electrical characteristics
Rated operating frequency
Pass band
Peak factor
MTBF (MIL-HDBK-217E)
12.2.2.1 lf-su ply
The unit requires outside power source for the protection and alarm signal functions..2 uxiliary power supply
The outside auxiliary power supply provided using galvanically-separated power pack.
The characteristics the busbar current are given the table below:
50/60 ±10%
3000 max
6. 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.3 max In
15 years 45°C
C haracteristics Relay Enabling
E1.
31/158
.E6
Three-phase minimum busbar current for enabling relay (LED alive and full relay operation) >70 >140 A
12. For itto function, simply needs the current defined below flowing least one phase.2. The unit's protection parameters
and general operating mode can set entirely the user..
The unit opens the circuit-breaker which installed means the TC, which takes effect directly the device's mechanical leverism. Circuit-breakers.
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. outside power source can, however,
be connected enable other functions and particularly for its connection the separate devices: HMI030 and PR021/K.
12.
Example: the E1B800 with 400A Rating Plug has 800A and 400A
