OV
I
t8 9
I V
SACE TMAX XT UL/CSA LOW VOLTAGE MOLDED CASE C I RCUI T- BRE AKERS UL4 89 AND CSA C2 2 . 2 STANDARDS
3/38
t
t
I4 — Ekip Touch/Hi-Touch Protection functions t4 I t f t f12 t12 UF
OF
I3
f13
t13
f
I
voltage unbalance S2 - Second time-delayed overcurrent protection In addition to the Standard S protection, a second (excludible) time-constant protection is available that enables two independent thresholds to be set to ensure precise selectivity, especially under highly critical conditions.
t
mean
t
U14 Extremely Inverse Very Inverse Standard Inverse
I2
8
t2
U1 U2 U3
I
I
Phase sequence This function gives an alarm in case of phase sequence inversion.
V1
t t
t
Extremely Inverse Very Inverse Standard Inverse Extre ely Inverse Very Inverse Standard Inverse
I1
senso ciclico
t1
8 8
UV
U8
V3
V2
t8
I
I
V
UV - Undervoltage (UV - ANSI 27) With a constant trip time (t = k), this trips when the phase voltage falls below the set threshold.
t t t
UV V OV
U8 8
U9
t8 t8
V V
t8 9
OV - Overvoltage (OV - ANSI 59) With a constant trip time (t = k), this trips when the phase voltage exceeds the set threshold.
t t t
OV UF
U9 9
f12
t8 t9 t8 t9
V
t12
f
UV2 & OV2 - Second protection against undervoltage and overvoltage (ANSI 27 and 59) This enables two minimum and maximum voltage thresholds to be set with different delays to discrimi- nate, for example, between voltage dip transients due to the start-up of a motor and an actual fault.
t t t
U9
f12 f12
UF O
t9
f13
U16
t12 t12
t16
t13
f f V f
t t
VU - Voltage unbalance (VU – ANSI 47) With a constant trip time (t = k), this protects against an unbalance between the voltages of the single phases that are protected by the circuit-breaker.
mean
OF OF
f13 f13
voltage unbalance
U14
t13 t13
f f
U1 U2 U3
mean ean
V1
voltage unbalance senso ciclico l l
U14 14
U1 U2 U3 1 U2 3
V3
V2
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