M12352-1 v15
Table 65. Thermal overload protection, one time constant LCPTTR/LFPTTR
Function
Range or value
Accuracy
Reference current
(2-400)% of IBase
±1.0% of I
r
Reference temperature
(0-300)°C, (0 - 600)°F
±
1.0°C, ±2.0°F
Operate time:
2
2
2
2
ln
p
Trip
Amb
ref
ref
I
I
t
T
T
I
I
T
σ
,
<
,
,
√
EQUATION13000039 V3 EN-US
(Equation 1)
T
Trip
= set operate temperature
T
Amb
= ambient temperature
T
ref
= temperature rise above ambient at I
ref
I
ref
= reference load current
I = actual measured current
I
p
= load current before overload occurs
Time constant
t
= (1–1000)
minutes
IEC 60255-149, ±5.0% or ±200 ms whichever is greater
Alarm temperature
(0-200)°C, (0-400)°F
±2.0°C, ±4.0°F
Operate temperature
(0-300)°C, (0-600)°F
±2.0°C, ±4.0°F
Reset level temperature
(0-300)°C, (0-600)°F
±2.0°C, ±4.0°F
M12353-1 v15
Table 66. Breaker failure protection CCRBRF
Function
Range or value
Accuracy
Operate phase current
(5-200)% of
lBase
±1.0% of I
r
at I
£
I
r
±1.0% of I at I > I
r
Reset ratio, phase current
> 95%
-
Operate residual current
(2-200)% of
lBase
±1.0% of I
r
at I
£
I
r
±1.0% of I at I > I
r
Reset ratio, residual current
> 95%
-
Phase current level for blocking of contact function (5-200)% of
lBase
±1.0% of I
r
at I
£
I
r
±1.0% of I at I > I
r
Reset ratio
> 95%
-
Operate time for current detection
10 ms typically
-
Reset time for current detection
10 ms maximum *
-
Time delay for retrip at 0 to 2 x I
set
(0.000-60.000) s
±0.2% or ±15 ms whichever is greater
Time delay for backup trip at 0 to 2 x I
set
(0.000-60.000) s
±0.2% or ±15 ms whichever is greater
Time delay for backup trip at multi-phase start at 0
to 2 x I
set
(0.000-60.000) s
±0.2% or ±20 ms whichever is greater
Additional time delay for a second backup trip at 0
to 2 x I
set
(0.000-60.000) s
±0.2% or ±20 ms whichever is greater
Time delay for alarm for faulty circuit breaker
(0.000-60.000) s
±0.2% or ±15 ms whichever is greater
Minimum trip pulse duration
(0.010-60.000) s
±0.2% or ±5 ms whichever is greater
* Valid for product version 2.2.3 or later
Line differential protection RED670
1MRK 505 379-BEN R
Version 2.2
106
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