SJKM1E Molded Case Circuit Breaker ECB

The SJKM1E Molded Case Circuit Breaker ECB delivers comprehensive circuit protection for 400V AC systems (50/60Hz, up to 800A). Featuring adjustable overcurrent, short-circuit (instantaneous/delayed), and optional undervoltage/phase-failure protection, this SJKM1E ECB ensures reliable power distribution with minimized downtime. Available in M-type and H-type (high-breaking capacity) versions, it offers 800V insulation and superior arc resistance. With vertical/horizontal installation options and isolation capability (symbol: -), this IEC60947-compliant circuit breaker supports industrial automation through "Z"/"B" type units with communication interfaces for remote monitoring.

product details

Type Designation

①	Business Code
②	Molded Case Circuit Breaker(MCCB) Designation
③	Design code
④	Electronic Release
⑤	Frame Current Rating (A)
⑥	Rated Ultimate Three-Phase Breaking Capacity Class (Note 1)
⑦	Operation Mode (Note2)
⑧	Number of poles
⑨	Release Mechanism Type and Accessory Code
⑩	Product Type (Note 3)

Usage Environment Conditions

● Altitude: ≤ 2000 m; Ambient temperature: -5°C ~ +40°C;

● Resistant to the effects of humid air;

● Resistant to the effects of salt mist and oil mist;

● The installation category of the main circuit of the circuit - breaker is III, and the installation categories of the remaining auxiliary circuits and control circuits are II;

● When the maximum temperature is +40°C, the relative air humidity shall not exceed 50%. A higher relative humidity is allowed at lower humidities. Special measures should be taken for the occasional occurrence of condensation due to temperature changes;

● Maximum inclination: 22.5°;

● In a non - explosive medium, and the medium does not contain gases and conductive dusts that can corrode metals and damage insulation;

● In a place without rain and snow attacks.

product Display

SJKM1E Molded Case Circuit Breaker ECB (3)

SJKM1E Molded Case Circuit Breaker ECB (2)

SJKM1E Molded Case Circuit Breaker ECB (1)

Product Structure and Marking Instructions

◆ Circuit Breaker Front Indicator (or Circuit Breaker Faceplate Indications)

◆ Overload long-time delay trip current I1 adjustment: According to the different rated currents of the circuit breaker, adjustment can be made from 4th to 10th gear;

◆ Long-time delay action time t1 adjustment: 4 gears can be adjusted;

◆ Short-time delay trip current I2 adjustment: 10 gears can be adjusted;

◆ Short-time delay action time t2 adjustment: 4 gears can be adjusted;

◆ Instantaneous trip current I3 adjustment: 8th, 9th, or 10th gear can be adjusted;

◆ Pre-alarm trip current Ir0 adjustment: 7 gears can be adjusted;

◆ Test terminal, used for undervoltage release testing (or trip unit testing).

Technical Parameters

Model	SJKM1E-125				SJKM1E-250
Shell - frame Rated Current Inm(A)	125				250
Rated Current (Adjustable) In(A)	16-32A 32-63A 63-125A adjustable adjustable adjustable				100-250A adjustable
Rated Operating Voltage Ue(V)	AC400V
Rated Insulation Voltage Ui(V)	AC800V
Rated Impulse Withstand Voltage Uimp(V)	AC800V
Number of Poles	3		4		3		4
Rated Ultimate Short - circuit Breaking Capacity Level	M	H	M	H	M	H	M		H
Rated Ultimate Short - circuit Breaking Capacity Icu(kA)	50	85	50	85	50	85	50		85
Rated Service Short - circuit Breaking Capacity Ics(kA)	35	50	35	50	35	50	35		50
Rated Short - time Withstand Current Icw(kA)/1s
Utilization Category		A				A
Operating Performance (times)	Energized	3000				3000
	De - energized	7000				7000
Overall dimensions	L	150				165
	W	92		122		107		142
	H	92				90
Arcing Distance (mm)		≤50				≤50

SJKM1E-400				SJKM1E-630				SJKM1E-800
400				630				800
200~400A adjustable				400~630A adjustable				630~800A adjustable
AC400V
AC800V
AC800V
3		4		3		4		3		4
M	H	M	H	M	H	M	H	M	H	M	H
75	85	75	85	80	100	80	100	80	100	80	100
55	65	55	65	60	70	60	70	60	70	60	70
5				8				10
B				B				B
2000				1500				1500
4000				3000				3000
257				280				280
150				210		280		210		280
16.5				115.5				115.5
≤100				≤100				≤100