GTM3E MCCB Electronic Molded Case Circuit Breaker

Overview 

Molded case residual current circuit breaker (hereinafter referred to as residual current operated circuit breaker) is suitable for AC 50Hz, rated voltage up to 400V, in circuits with rated current from 16A to 800A. Its main function is to provide indirect contact protection against fatal electric shock to personnel. Residual current operated circuit breakers with rated residual operating current not exceeding 30mA can also serve as supplementary protection for direct contact when other protective measures fail, but cannot be used as the sole direct contact protection. Meanwhile, it can also be used to prevent electrical fires caused by contact fault currents. It can also be used to protect circuits from overload and short circuit, and as infrequent switching of circuits.

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Product Features

• With three-stage protection (LSI) featuring adjustable      actuation current and time, self-powered operation: Provides adjustable Long-time (L), Short-time (S), and      Instantaneous (I) protection with configurable actuation current and time      settings, powered by its own source.

• Users can set and adjust the trip unit according to load      current requirements:      Allows users to configure the trip unit settings based on specific load      current demands.

• With pre-alarm indication and overload indication: Equipped with a pre-alarm warning function and a clear      overload indication.

• Features a fire protection mode where overload triggers alarm      only without tripping:      Includes a dedicated function for fire service applications where overload      conditions activate an alarm only without causing the breaker to trip.

• A handheld dedicated tester is provided for user convenience in      detecting circuit breaker parameters: Comes with a portable, specialized tester to facilitate easy      checking and verification of circuit breaker parameters for users.

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Applicable Working Environment and Installation Conditions:

• The altitude of the installation site shall not exceed 2,000m.

• The ambient air temperature shall not exceed +40°C and shall      not be lower than -5°C, with a 24-hour average value not exceeding 35°C      (unless otherwise specified in special orders).

• The relative air humidity at the installation site shall not      exceed 50% at the maximum temperature of +40°C. At lower temperatures,      higher relative humidity is permissible, e.g., up to 90% at 20°C. Special      measures shall be taken against occasional condensation due to temperature      variations.

• For tropicalized circuit breakers, the relative air humidity      shall not exceed 95% at ±25°C.

• Pollution Degree: Level 3.

• The installation category of the main circuit of the circuit      breaker is Category III, while auxiliary and control circuits not      connected to the main circuit are Category II.

• Tropicalized circuit breakers shall withstand the effects of      humidity, salt mist, and mold.

• The circuit breaker shall be installed in locations free from      explosion hazards, conductive dust, and conditions that may corrode metals      or cause insulation damage.

• It shall be installed in places without exposure to rain or      snow.

• The circuit breaker shall be installed in accordance with the      product's instruction manual.

Technical Data

hstand current lcw(kA)1s

Model		KJM3E-125		KJM3E-250		KJM3E-400		KJM3E-630		KJM3E-800
Frame   current Inm(V)		125		250		400		630		800
Breaking   capacity level		M	H	M	H	M	H	M	H	M	H
Rated   currentlr1(A)		32   (16,20,25,32) 63 (32),36,40,45 ,50,55,60,63) 100 (63),65,70 ,75,80,85,90   ,95,100)		225   (100,125 ,140,160,180,200 ,225)		400   (200,225,250 280,315 ,350,400)		630   (400,420,440 460,500,530,560 600,630)		800   (630,640,660 680,700,720,740 760,780,800)
Number   of poles		3		3		3		3		3
Rated   insulation voltage Ui(V)		800
Rated   operating voltage Ue(V)		400
Rated   impulse withstand voltage Uimp(V)		8000
Rated   ultimate short-circuit breaking capacity lcu(kA)		50	85	50	85	65	100	65	100	75	100
Rated   operating short-circuit breaking capacity lcs(kA)		35	50	35	50	42	65	42	65	50	65
Rated   operating short-circuit wit							5		8		10
Use   Category			A		A		B		B		B
Arcing   distance(mm)		≯50				≯100
Operational performance	Power   on (times)	1500		1000		1000		1000		500
	No power (times)	8500		7000		4000		4000		2500

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Power loss

Model	Current(A)	Total three-phase power loss
		Front and rear panel wiring	Plug-in   wiring
KJM3E-125	100	35	40
KJM3E-250	225	62	70
KJM3E-400	400	115	125
KJM3E-630	630	190	210
KJM3E-800	800	262	294

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The derating factor when the ambient temperature changes

Model	+40℃	+45℃	+50℃	+55℃	+60℃
KJM3E-125	1ln	0.95ln	0.89ln	0.84ln	0.76ln
KJM3E-250	1ln	0.96ln	0.91ln	0.87ln	0.82ln
KJM3E-400	1ln	0.94ln	0.87ln	0.81ln	0.73ln
KJM3E-630	1ln	0.91ln	0.85ln	0.80ln	0.74ln
KJM3E-800	1ln	0.881ln	0.83ln	0.79ln	0.76ln

Note:  The above derating factors are all measured under the rated current of the frame.

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The long-delay overcurrent protection inverse time action characteristics

Current		Action time
Power distribution	1.05lr1	2hNo action inside
	1.3lr1	≤1h   action
	2lr1	Setting   time T1(s)	INM=100,225A				INM=400,630,800A
			12	60	80	100	12	60	100	150
Motor protection	1.05lr1	2hNo action inside
	1.2lr1	≤ 1haction
	1.5lr1	Action   time T1(s)	INM=100,225A				INM=400,630A
			21.3	107	142	178	21.3	107	178	267
	2lr1	Action   time T1(s)	12	60	80	100	12	60	100	150
	7.2lr	Setting   timeT1(s)	0.93	4.63	6.17	7.72	0.93	4.63	7.72	11.6

Note:

1. Action time load I²T1 = (2lr1)²t1(1.2Ir≤ 1 <Ir2);

2. The action time tolerance is ± 20%;

3. The return time is not less than the action time 70%.

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Short-time overcurrent

Current	Action   time
Ir2≤ 1≤1.5lr2	Inverse time limit		l2T1=(1.5lr1)2t2
1.5lr2≤1 ≤ Ir3		Setting timet2(s)	0.06	0.1	0.2	0.3
(Note: The tolerance of inverse time action is   ±20%)	Time limit	Tolerance(s)	±0.02	±0.03	±0.04	±0.06
		Return time(s)			0.14	0.21

Outline and Installation Dimensions (mm)

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