Schneider Electric Class 615 Trip Units for Compact NSJ400 and NSJ600 Circuit Breakers, STR53UP

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