Schneider Electric 3.0A, 2.0A, and 6.0A, 5.0A manual Trip Unit Switches, Long-Time Protection

Micrologic™ 2.0A, 3.0A, 5.0A, and 6.0A Electronic Trip Units	48049-136-05
Section 1—General Information	Rev. 01, 07/2012

Trip Unit Switches

ENGLISH

Long-Time Protection

Long-time protection protects equipment against overloads.

NOTE: Micrologic trip units are powered from the circuit to always provide fault protection. All other functions (display, metering, communications, etc.) require external power. See 15 for more information.

Figure 7: Long-Time Protection Switches

• Long-time protection is standard on all trip

units.

• The long-time pickup (Ir) (A) sets the

maximum current level (based on sensor

plug rating In) which the circuit breaker can

continuously carry. If current exceeds this

value, circuit breaker will trip after the preset

time delay. The long-time pickup (Ir) is

adjustable from 0.4–1.0 times the sensor

plug rating (In).

• The long-time delay (tr) (B) sets the length of

the time that the circuit breaker will carry an

overcurrent (below the short-time or

instantaneous pickup current level) before

Micrologic 2.0A Trip Unit

A B C

06134243	.6			.95	2		16
				time
	Ir		.8		tr	4 8		alarm
	.7			.9	(s)		12
	.5			.98	1		20
		.4 x In 1				.5 @ 6 Ir24
		instantaneous
	Isd		4
	3			5
	2.5			6
	2			8
	1.5 x Ir 10
		setting

Micrologic 3.0A Trip Unit

A B C

06133203	.6			.95	2		16
				time
	Ir		.8 .9		tr	4 8		alarm
	.7				(s)		12
	.5			.98	1		20
		.4 x In 1				.5 @ 6 Ir24
		instantaneous
	Ii		5
	4			6
	3			8
	2			10
	1.5			12
			x In

setting

tripping. See Table 1 for delay settings.

• Both long-time pickup and long-time delay

are on the field-replaceable adjustable rating

plug. To change settings to more precisely

match the application, various rating plugs

are available. For instructions on replacing

the rating plug, see Section 5 —Adjustable

Rating Plug Replacement.

• For Masterpact™ NT and NW circuit

breakers, the In value can be changed by

replacing the sensor plug below the trip unit.

For further information, see the instructions

packed with the sensor plug replacement kit.

• The overload indicator light (C) indicates that

Micrologic 5.0A Trip Unit

A B C

06133204				time
	Ir		.8 .9			tr			8			alarm
	.7					(s)	4			12
	.6			.95	2					16
	.5			.98	1					20
	.4 x In 1						.5 @ 6 Ir24
		short time										instantaneous
	Isd		4			tsd			.4	.3	I i		8
	3			5		(s)	.4				6			10
					.3					.2
	2.5			6							4			12
	2			8	.2					.1	3			15
	1.5			10			.1		2	0	2			off
			x Ir			on			I t	off			x In
		setting						delay

Micrologic 6.0A Trip Unit

06133351	A					B						C
			long time
	Ir			.8		tr		8			alarm
	.7				.9	(s) 4			12
	.6				.95	2			16
	.5				.98	1			20
		.4 x In 1				.5 @ 6 Ir24
			short time								instantaneous
	Isd			4		tsd	.4	.4 .3		I i
												8 10
	3				5	(s)				5
						.3			.2
	2.5				6					4		12
	2				8	.2			.1	3		15
		1.5 x Ir			10	.1		I2t	0		2 x Inoff
						on			off
			setting				delay					test
	Ig			E		tg	.4	.4 .3
		D			F	(s)
	C				G	.3			.2
	B				H	.2			.1
		A			J	.1		I2t	0
						on			off
		ground fault

the Ir long-time pickup threshold has been

exceeded.

• Long-time protection uses true RMS

measurement.

Thermal imaging provides continuous temperature rise status of the wiring, both before and after the device trips. This allows the circuit breaker to respond to a series of overload conditions which could cause conductor overheating, but would go undetected if the long-time circuit was cleared every time the load dropped below the pickup setting or after every tripping event.

Table 1:	Micrologic Trip Unit Long-Time Delay Values
Setting1	Long-Time Delay in Seconds2
tr at 1.5 x Ir	12.5	25	50	100	200	300	400	500	600
tr at 6 x Ir	0.5	1	2	4	8	12	16	20	24
tr at 7.2 x Ir	0.343	0.69	1.38	2.7	5.5	8.3	11	13.8	16.6

1Ir = In x long-time pickup. In = sensor rating. Trip threshold between 1.05 and 1.20 Ir.

2Time-delay accuracy +0/-20%

3For Micrologic 5.0A and 6.0A trip units, when tsd is set to 0.4 on or 4.0 off, then tr = 0.5 instead of 0.34.

NOTE: If checking trip times, wait a minimum of 15 minutes after circuit breaker trips before resetting to allow the thermal imaging to reset completely to zero or use a full-function test kit to defeat the thermal imaging.

10-EN © 1999–2012 Schneider Electric All Rights Reserved