SACE EMAX 2 NEW LOW VOLTAGE POWER C I RCUI T BRE AKERS TO ANS I C37 / UL 1066 / CSA STANDARDS
3/20
— Technical characteristics for protection trip units Protection functions
ABB Code ANSI/IEEE C37.2 Code
Function
Threshold
L
49
Overload protection
I1 = 0.4 - 0.42 - 0.45 - 0.47 - 0.5 - 0.52 - 0.55 - 0.57 - 0.6 - 0.62 - 0.65 - 0.67 - 0.7 - 0.72 - 0.75 - 0.77 - 0.8 - 0.82 - 0.85 - 0.87 - 0.9 - 0.92 - 0.95 - 0.97 - 1 x In
Thermal memory
Tolerance
trip between 1.05 and 1.2 x I1
S
50TD
Time-delayed overcurrent protection
I2 = 0.6 - 0.8 - 1 - 1.5 - 2 - 2.5 - 3 - 3.5 - 4 - 5 - 6 - 7 - 8 - 9 - 10 x In
± 7% If ≤ 6 x In ± 10% If > 6 x In
Tolerance
51
Time-delayed overcurrent protection
I2 = 0.6 - 0.8 - 1 - 1.5 - 2 - 2.5 - 3 - 3.5 - 4 - 5 - 6 - 7 - 8 - 9 - 10 x In
Thermal memory Tolerance
± 7% If ≤ 6 x In ± 10% If > 6 x In
I
50
Instantaneous overcurrent protection
I3= 1.5 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 x In
Tolerance
± 10%
G
50N TD
Ground fault protection
I4 (1) = 0.1 - 0.2 - 0.3 - 0.4 - 0.6 - 0.8 - 1 x In
Tolerance
± 7%
51N
Ground fault protection
I4 (1) = 0.1 - 0.2 - 0.3 - 0.4 - 0.6 - 0.8 - 1 x In
Tolerance
± 7%
(1) With Vaux all thresholds are available. Without Vaux minimum threshold is limited to: 0.3In (with In = 100A), 0.25In (with In = 400A) or 0.2In (for all other ratings) (2) The minimum trip time is 1s, regardless of the type of curve set (self-protection)
(3) Total clearing time is the sum of breaking time and trip time The tollerances above apply to trip units already powered by the main circuit with current flowing in at least two phases or an auxiliary power supply. In all other cases the following tollerance values apply
ABB Code
Trip threshold
Trip time
L S
Trip between 1.05 and 1.2 x I1
± 20% ± 20%
± 10% ± 15% ± 15%
≤ 60ms
I
G
± 20%
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