Compact® NSF and NSJ 150 to 600 A Circuit Breakers

Section 4—Trip Units

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:

NSJ400—150, 250 and 400 A

NSJ600—600 A

Trip Units

Protection for loads, from 60 to 600 A

STR23SP,

— STR23SP and STR53UP for standard protection

STR53UP and

STR23SP-OSN for oversized neutral protection (factory-installed only)

STR23SP-OSN

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 ground-fault protection

 

STR23SP and STR53UP available on four-pole circuit breakers with sealable, 3-position neutral

 

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

 

 

 

 

STR23SP OSN

 

Circuit Breakers

 

 

 

 

 

(Oversized Neutral)

 

 

 

 

 

 

 

 

Overload Protection (Long Time)

 

 

 

 

 

 

 

 

 

 

 

Tripping

Ir

20–70° C

Adjustable (48 Settings) 0.4–1 x In

 

 

 

 

 

 

 

Threshold (A)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fixed

Adjustable

 

 

 

 

Fixed

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Tripping Time (s)

At 1.5 x Ir

120–180

17–25

 

34–50

69–100

138–200

277–400

120–180

 

(Min–Max)

 

 

At 6 x Ir

5–7.5

0.8–1

 

1.6–2

3.2–4

6.4–8

12.8–16

5–7.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

At 7.2 x Ir

3.2–5.0

0.5–0.7

 

1.1–1.4

2.2–2.8

4.4–5.5

8.8–11

3.2–5.0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Short-circuit Protection (Short Time)

 

 

 

 

 

 

 

 

 

 

 

 

 

Im / Isd

 

Adjustable (7 Settings)

Adjustable (7 Settings) 1.5–7 x Ir

 

 

Adjustable (7 Settings) 2–9 x Ir

Tripping

 

2–9 x Ir

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Accuracy

 

± 15%

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Max. Overcurrent Time Before Tripping

Fixed 40

Adjustable (4 Settings + Constant I2t Function)

 

Fixed 40

 

Time Delay

15

60

140

230

 

 

 

 

 

 

 

 

 

 

(ms)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Total Breaking Time

 

60

60

140

230

350

 

60

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Short-circuit Protection (Instantaneous)

 

 

 

 

 

 

 

 

 

 

Tripping Threshold (A)

 

Fixed 9 x In

Adjustable (7 Settings) 1.5–9 x In

 

 

Fixed 9 x In

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Adjustable Neutral Protection (Three Position Switch)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NSJ250/400N

 

NSJ400/600N

 

 

 

Switch

Settings

Protection Level

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Position 1

4P 3D

No Protection

No Protection

 

 

 

No Protection

 

No Protection

 

 

 

Position 2

4P 3D + N/2

0.5 x Ir

0.5 x Ir

 

 

 

 

0.8 x Ir

 

0.75 x Ir

 

 

 

Position 3

4P 4D

1.0 x Ir

1.0 x Ir

 

 

 

 

1.6 x Ir

 

1.5 x Ir

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Other Functions

 

 

 

 

 

 

 

 

 

 

 

Indication of Fault Type

 

 

(Standard)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Equipment Ground-fault Protection (T)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Built-in Ammeter (I)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Zone-selective Interlocking (ZSI)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Communication (COM)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

© 1995–2003 Schneider Electric All Rights Reserved

11

Page 11
Image 11
Schneider Electric Class 615 dimensions Trip Units for Compact NSJ400 and NSJ600 Circuit Breakers, STR53UP