Technical information

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1SDC210033D0202
The tables below give details of the logic with which each thermomagnetic trip units, electronic trip
units and residual current devices has been named.
Magnetic trip units
Family Name Protection
M: magnetic
+
F: with fixed threshold
A: with adjustable threshold
Thermomagnetic trip units
Family Name Protection
TM: thermomagnetic
+
A: with adjustable thermal and magnetic threshold
D: with adjustable thermal and fixed magnetic threshold
G: with adjustable thermal and fixed magnetic threshold
(for generator protection)
Example:
Q
MA: magnetic only trip unit, with adjustable protection threshold;
Q
TMD: thermomagnetic trip unit, with adjustable thermal and fixed magnetic protection threshold;
Q
TMG: thermomagnetic trip unit, with adjustable thermal and fixed magnetic protection threshold, specifically
for protection of generators.
Electronic trip units
Family Name Application Protection Circuit-breaker
(1)
Ekip
+
….: Distribution
M: Motor protection
G: Generator protection
N: Neutral
E: Energy measurements
+
I
LS/I
LSI
LSIG
LIU
LRIU
XT2
XT4
(1)
Circuit-breaker has to be defined only with loose release.
Example:
Q
Ekip LS/I: electronic trip unit for distribution networks protection, with “L” against overload and as an alterna-
tive “S” protection function against delay short circuit or “I” protection function against instantaneous short
circuit;
Q
Ekip M-LRIU: electronic trip unit for motors protection, with LRIU protection functions;
Q
Ekip N-LS/I XT2: loose electronic trip unit for the neutral protection, with “L” against overload and as an alter-
native “S” protection function against delay short circuit or “I” protection function against instantaneous short
circuit.
Residual Current Protection Devices
Family Name Typology
RC
+
Inst: instantaneous type “A”
Sel: selective type “A”
Sel 200: selective type “A” reduced to 200mm
B Type: selective type “B”
Example:
Q
RC Inst: residual current protection device with instantaneous timing;
Q
RC Sel 200: residual current protection device with adjustable time trip, reduced to 200mm;
Q
RC B type: residual current protection device “B” type.
Nomenclature of the trip units and
residual current protection devices