Compact® NSF and NSJ 150 to 600 A Circuit Breakers
Section
TRIP UNITS FOR COMPACT® NSJ400 AND NSJ600 CIRCUIT BREAKERS
Compact NSJ400 and NSJ600 circuit breakers are equipped with current sensors and electronic trip units.
Current Sensors Four different sizes are available and can be mounted with all trip units:
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Trip Units | • Protection for loads, from 60 to 600 A | |
STR23SP, | — STR23SP and STR53UP for standard protection | |
STR53UP and | — | |
| — | STR53UP for generator supplied network protection and long cable runs |
| • Trip units STR23SP and STR53UP can be mounted on all Compact NSJ400 and NSJ600 circuit | |
| breaker types N, H and L | |
| • Trip unit STR53UP offers a greater number of optional indication and measurement functions, | |
| protection settings and | |
| • STR23SP and STR53UP available on | |
| protection setting: | |
| — | 4P 3D (neutral unprotected) |
— 4P 3D + N/2 (neutral protection at 0.5 x Ir) where Ir is trip unit current setting
— 4P 4D (neutral protection at Ir) where Ir is trip unit current setting
Trip Units for Compact® NSJ400 and NSJ600 | STR23SP | STR53UP |
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Overload Protection (Long Time) |
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Tripping | Ir | Adjustable (48 Settings) |
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Threshold (A) |
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| Fixed | Adjustable |
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Tripping Time (s) | At 1.5 x Ir |
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| At 6 x Ir |
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| At 7.2 x Ir |
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| Im / Isd |
| Adjustable (7 Settings) | Adjustable (7 Settings) |
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Tripping |
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| Accuracy |
| ± 15% |
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| Max. Overcurrent Time Before Tripping | Fixed ≤40 | Adjustable (4 Settings + Constant I2t Function) |
| Fixed ≤40 |
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Time Delay | ≤15 | ≤60 | ≤140 | ≤230 |
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| Total Breaking Time |
| ≤60 | ≤60 | ≤140 | ≤230 | ≤350 |
| ≤60 |
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Tripping Threshold (A) |
| Fixed ≥ 9 x In | Adjustable (7 Settings) |
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| Fixed ≥ 9 x In |
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Adjustable Neutral Protection (Three Position Switch) |
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| NSJ250/400N |
| NSJ400/600N |
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| Switch | Settings | Protection Level |
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| Position 1 | 4P 3D | No Protection | No Protection |
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| No Protection |
| No Protection | ||
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| Position 2 | 4P 3D + N/2 | 0.5 x Ir | 0.5 x Ir |
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| 0.8 x Ir |
| 0.75 x Ir | |
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| Position 3 | 4P 4D | 1.0 x Ir | 1.0 x Ir |
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| 1.6 x Ir |
| 1.5 x Ir | |
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Other Functions |
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Indication of Fault Type |
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Equipment |
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Communication (COM) |
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