Schneider Electric 5.0A, 3.0A Indicator Lights, Ground-Fault Protection, Overload Indicator Light

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

Ground-Fault Protection

Figure 10: Ground-Fault Protection Switches

Micrologic 6.0A Trip Unit

Equipment ground-fault protection protects conductors against overheating and faults from ground-fault currents (￿￿1200 A).

• Equipment ground-fault protection is

standard on 6.0A trip units.

• Ground-fault pickup (Ig) (A) sets ground

current level where circuit breaker will trip

after the preset time delay.

• Ground-fault delay (tg) (B) sets the length of

time that the circuit breaker will carry a

ground-fault current above the ground-fault

pickup current level before tripping.

A

B

06133351

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

fault

alarm

instantaneous

I i

8

5 10

4 12

315

2off

x In

test

ENGLISH

• Equipment ground-fault protection can be

zone-selective interlocked (ZSI) with

upstream or downstream circuit breakers.

• Setting the ground-fault delay (tg) to the 0

setting turns off zone-selective interlocking.

• Neutral protection and equipment ground-

fault protection are independent and can

operate concurrently.

Table 4:	Micrologic Trip Unit Ground-Fault Pickup Values
Ig (= In x....)		A	B	C	D	E	F	G	H	J
In ￿ 400 A		0.3	0.3	0.4	0.5	0.6	0.7	0.8	0.9	1
400 A < In ￿ 1200 A		0.2	0.3	0.4	0.5	0.6	0.7	0.8	0.9	1
In > 1200 A		500 A	640 A	720 A	800 A	880 A	960 A	1040 A	1120 A	1200 A
In = sensor rating.

Ig = ground-fault pickup.

Table 5:	Micrologic Trip Unit Ground-Fault Delay Values
Setting		Ground-Fault Delay
I2t off (ms at In) (seconds)		0	0.1	0.2	0.3	0.4
I2t on (ms at In) (seconds)		–	0.1	0.2	0.3	0.4
tsd (min. trip) (milliseconds)		20	80	140	230	350
tsd (max. trip) (milliseconds)		80	140	200	320	500

NOTE: Use I2t off with ZSI for proper coordination. Using I2t on with ZSI is not recommended as the delay in the upstream device receiving a restraint signal could result in the trip unit tripping in a time shorter than the published trip curve.

Indicator Lights

Overload Indicator Light

Figure 11: Overload Indicator Light

The overload indicator light (A) lights when the Ir long-time pickup level has been exceeded (over 100% on the bar graph).

06133352

			long time
		Ir		.8			tr		8 12
		.7			.9		(s) 4
		.6			.95		2		16
		.5			.98		1		20
		.4 x In 1					.5 @ 6 Ir24
			short time
		Isd					tsd		.4 .3
	3			4	5		.4
	2.5				6		.3		.2
	2				8		.2		.1
		1.5 x Ir			10		.1		0
							on		I2t
			setting					delay
		IΔn				ΔI
		(A) 3		5	7 (ms)230				350
2					10		140
1					20
.5					30		60		800

alarm

instantaneous

I i	4
3		5
2.5		6
2		8

1.510

x In

test

A

100%

40 %

earth leakage

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