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12.2.2. Compatibility CB
PR121/P can be installed on 3-pole CBs with and without an external neutral, or on 4-pole Emax CBs of any model.
The CB model establishes the rated uninterrupted current the circuit-breaker is able to support (lu).
The adjustable protections (L, S, I and G) refer to the In model, defi ned by the interchangeable Rating plug module installed on
the relay.
12.2.3. Standards
The PR121/P has been designed to work in accordance with the following international standard:
IEC 60947-2 Low voltage apparatus. Circuit-breakers.
12.2.4. Environmental characteristics
Operating temperature (Standard version)
Operating temperature (LTT version for low temperatures)
Storage temperature
Relative humidity
Degree of protection (with PR121/P installed in the circuit-breaker)
12.2.5. Electrical characteristics
12.2.5.1. Primary current
Rated operating frequency
Peak factor
12.2.5.2. Power supply
The relay unit needs a power source: this can be supplied by current sensors installed on the internal poles
of the circuit-breaker or by means of an auxiliary source:
- All that's needed to supply the relay by means of internal current sensors is the presence of minimum three-phase turn-on
current, as shown in the table below.
- Provided by a galvanically-separated power supplier, the external auxiliary power supply ensures continuous for the unit (even
when there is no current fl ow, or in the open circuit-breaker condition) and adds to the accessory functions of the relay allowing
HMI030 and Flex Interface external devices to be used.
To improve the supply condition, ABB recommends use of the auxiliary supply source when there are low load current values
and/or distorted signals.
Primary current characteristics
Minimum three-phase busbar current
Frequency, Peak factor
Auxiliary power supply characteristics
DC voltage (galvanically separated)
Maximum ripple
Inrush current @ 24V
Rated power @ 24V
NOTE:
(
*
)
: Emax E1 and E2 Iu=250A: minimum three-phase busbar current >30A.
WARNING: Since the auxiliary voltage needs to be isolated from the ground, "galvanically separated converters"
in accordance with the IEC standard 60950 (UL 1950) or the equivalent IEC 60364-41 and CEI 64-8 have to be
used to guarantee a current in common mode or leakage current (as defi ned in IEC 478/1 and CEI 22/3) no
greater than 3.5 mA.
Model
L6555
-25 °C ... +70 °C
-40 °C ... +70 °C
-40 °C ... +70 °C
0% ... 98% with condensation
IP 30
50/60 Hz ±10%
2,1 @ 2xIn
in conformity to IEC 60947 Annex F
(Consult ABB for a dedicated analysis if there are higher peak
factors)
CB E1, E2, E3
Apparatus
Doc. No
1SDH000460R0002
Range
CB E4, E6
(
)
>100 A
*
>200 A
see par. 12.2.5.1
Range
24 Vdc ±20%
5%
~10 A for 5ms
~1 W
Emax
Scale
Page No
37/74
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