13 Technical Specifications
Operating time IDMT characteristic shape As per clause 5.2 of IEC60255-
50 ms whichever is greater
DT operation ± 5% or 55 ms whichever is greater**
** Reference condition Currents applied at 2x pick-up level or
higher
CB Fail
I.
Operating time DT operation ± 5% or 55 ms whichever is greater
CBF Reset <40 ms*
Reset current Setting ± 10%
* Note : Filtering time (typically 25ms) is added when CBF initiated by external Binary input
Note: As per IEC60255-151 clause 5.2 (assigned error 5%), the tolerances are calculated as below.
Value of characteristic quantity as multiple of setting value (Gs)
Limiting error as multiple of an assigned error 2.5 1.5 1
Percentage for time accuracy claim
Operating conditions
I.
Relative humidity Humidity (RH) 95% maximum
II.
Operating temperature range -25 ºC to +55 ºC
III.
Storage temperature range -25 ºC to +70 ºC
I.
AC current input terminals M3.5 threaded terminals for ring lug connection. Suitable up to 4 mm
2
II.
Auxiliary & input/output
Terminals
M3 threaded terminal connection. Suitable up to 2.5 mm
2
III.
Tightening torque for M4/M3
screws
IV.
Rear communication terminal
Two wire connection. Suitable up to 2.5 mm
2
Mechanical & Environmental specification
I.
II.
III.
2.1.1 Standards Compliance
SR.
TYPE TEST STANDARD TEST SPECIFICATION/METHOD
1. Impulse, Dielectric and Insulation tests
1.1 Impulse voltage test
IEC 60255-27:2005
(incl. corrigendum 2007)
Test voltage 5kv, 1.2/50 µV
Energy 0.5 J
Polarity +ve and –ve
No. of impulses 3 on each polarity
Duration between impulses