China SJKM1L Earth Leakage Circuit Breaker ELCB: Reliable Industrial Safety Solution from China Suppliers & Factory Suppliers, Factories
China SJKM1L Earth Leakage Circuit Breaker ELCB: Reliable Industrial Safety Solution from China Suppliers & Factory Suppliers, Factories
China SJKM1L Earth Leakage Circuit Breaker ELCB: Reliable Industrial Safety Solution from China Suppliers & Factory Suppliers, Factories
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China SJKM1L Earth Leakage Circuit Breaker ELCB: Reliable Industrial Safety Solution from China Suppliers & Factory Suppliers, Factories
China SJKM1L Earth Leakage Circuit Breaker ELCB: Reliable Industrial Safety Solution from China Suppliers & Factory Suppliers, Factories
China SJKM1L Earth Leakage Circuit Breaker ELCB: Reliable Industrial Safety Solution from China Suppliers & Factory Suppliers, Factories

China SJKM1L Earth Leakage Circuit Breaker ELCB: Reliable Industrial Safety Solution from China Suppliers & Factory Suppliers, Factories

The SJKM1L Earth Leakage Circuit Breaker (ELCB) is a vital electrical protection device designed for 400V/50Hz systems with a current rating of up to 800A. As a leading product from China, our SJKM1L ELCB ensures comprehensive safety by providing overload, short-circuit, and reliable residual current protection (30mA-30A) to mitigate fire risks associated with ground faults. Available in both M-type (molded case) and H-type (high-breaking capacity) versions, this circuit breaker offers superior insulation up to 800V and robust vibration resistance. Its compact design allows for versatile installation, whether vertical or horizontal, within distribution panels. Ideal for motor circuits, industrial plants, and power distribution systems, this SJKM1L ELCB is essential for applications requiring infrequent switching and dependable earth leakage protection. Partner with trusted suppliers and manufacturers in the industry to enhance your electrical safety infrastructure
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Product Description

Type Designation
Type Designation Code Scheme for SJKM1L MCCB
① Manufacturer Code
② Molded Case Circuit Breaker (MCCB)
③ Design Serial Number
④ With Residual Current Protection
⑤ Frame Size
⑥ Breaking Capacity: L (Standard) | M (Medium) | H (High)
⑦ Operation: None (Manual) | Z (Rotary Handle) | D (Motorized)
⑧ Poles: 3 (3-Pole), 4 (4-Pole)
⑨ Trip Type & Accessory Code (See Table 1)
⑩ Application Code: None (Distribution) | 2 (Motor Protection)
⑪ 4-Pole Code (A/B/C/D for Neutral), 3-Pole: No Code
⑫ Alarm Module: Ⅰ (Alarm + Trip) | Ⅱ (Alarm Only)
Notes:
Frame Size: 1N25 (125A), 2N50 (250A), 4N00 (400A), 6N30 (630A), 8N00 (800A)
Product Display
SJKM1L Earth Leakage Circuit Breaker Front View
SJKM1L Earth Leakage Circuit Breaker Angled View
Trip - Opening Method and Accessory Code
Trip Opening Method and Accessory Code Matrix
Main Parameters and Technical Performances
Model SJKM1LE-125 SJKM1LE-250 SJKM1LE-400 SJKM1LE-630、800
Maximum Rated Current of Shell Frame Grade A 125 250 400 800
Rated Current In A 16 20 25 32
40 50 63 80
100 125		 125 160 180 200
225 250		 250 315
350 400		 400 500 630 700
800
Number of Poles 3 4 3 4 3 4 3 4
Rated Insulation Voltage Ui V AC800
Rated Working Voltage Ue V AC400
Rated Impulse Withstand Voltage Uimp V 8000
Arc-Quenching Distance mm 50 50 100 100
Breaking Capacity Icu / Ics L M L M L M L M
AC400V 35   50 35   50 50   65 50   65
AC400V 22   35 25   35 35   42 35   42
Rated Residual Short-Circuit Making (Breaking) Capacity Icu/4 8.75 12.5 15.75 16.25
Rated Residual Operating Current I△n (mA) Non-delay type 30/50/100
100/300/500		 30/50/100
100/300/500		 100/300/500 300/500/1000
Delay type 100/300/500 100/300/500 100/300/500 300/500/1000
Rated Non-operating Residual Current 1/2I△n 1/2I△n 1/2I△n 1/2I△n
Number of Operating Performances Energized 1500 1000 1000 1000
De-energized 8500 7000 4000 4000
Total number of times 10000 8000 5000 500
Operating Time of Residual Current Protection 2I△n 2I△n 5I△n 10I△n
Maximum Breaking Time (S) Non-delay type 0.2 0.1 0.4 0.04
Delay type 0.5/1.15/2.15 0.35/1/2 0.25/0.9/1.9 0.25/0.9/1.9
Outline and Installation Dimensions

◆ Outline and Installation Dimensions of the Circuit Breaker After Wiring

Circuit breaker rear-panel wiring

Circuit Breaker Rear-Panel Wiring Diagram
Model Overall Dimensions (mm) Installation Dimensions (mm)
L1 L2 L3 H1 H2 a1 b1 ΦD Φd
3P 4P 3P 4P
SJKM1LE-125 162 132 35 53 93 72 102 90 132 22 5.5
SJKM1LE-250 173 144 35 55 100 87 122 93 144 24 5.5
SJKM1LE-400 267 224 37 48.5 108.5 124 172 164 224 26 6.5
SJKM1LE-630/800 295 243 37 62 62 178 248 158 243 48 7.0

◆ Outline and Installation Dimensions of Plug-in Type Rear-panel Wiring

Plug-in Type Rear-Panel Wiring Dimensions Diagram
Model w L A H1 G G1 a b Φd
3P 4P 3P 4P
SJKM1LE-125 91 125 168 38 50 33 28 60 90 56 6.5
SJKM1LE-250 107 145 186 46 50 33 37 70 105 54 6.5
SJKM1LE-400 149 200 280 55 60 38 46 60 108 129 8.5
SJKM1LE-630/800 210 280 305 62 87 60 22 90 162 146 11

◆ Outline and Installation Dimensions of the Circuit Breaker with Front-panel Wiring

Circuit Breaker Front Terminal Dimensions Diagram

Circuit Breaker Front Terminal

Model Pole Overall Dimensions (mm) Installation Dimensions (mm)
L1 L2 L3 L4 a b Φd
SJKM1LE-125 2 65 151 110 75 129 2×Φ4.5
3 93 151 110 92 30 129 4×Φ4.5
4 123 151 110 92 60 129 6×Φ4.5
SJKM1LE-250 2 75 165 110 90 129 2×Φ4.5
3 107 165 110 90 35 126 4×Φ4.5
4 142 165 110 90 70 126 6×Φ4.5
SJKM1LE-400 3 154 257 146 106 44 194 4×Φ4.5
4 198 257 146 106 94 194 6×Φ4.5
SJKM1LE-630
SJKM1LE-800		 3 210 280 155 116 70 243 4×Φ7
4 280 280 155 116 140 243 6×Φ7
Frequently Asked Questions (FAQ)
What does SJKM1LE stand for in the type designation?
The SJKM1LE designation is a structured code: "SJ" represents the manufacturer code, "KM1" denotes the Molded Case Circuit Breaker (MCCB) series and design serial number, "L" indicates residual current (earth leakage) protection, and "E" identifies the frame size and breaking capacity level. Each segment provides specific information about the product's configuration and capabilities.
What are the available frame sizes for the SJKM1LE series?
The SJKM1LE series is available in five frame sizes: 1N25 (125A), 2N50 (250A), 4N00 (400A), 6N30 (630A), and 8N00 (800A). Each frame size corresponds to a specific maximum rated current and is designed for different load requirements in electrical distribution systems.
What breaking capacity options are available for the SJKM1LE circuit breakers?
The SJKM1LE series offers two breaking capacity levels at AC400V: Standard (L) and Medium (M). For the 125A and 250A models, Icu values are 35kA (L) and 50kA (M). For the 400A, 630A, and 800A models, Icu values are 50kA (L) and 65kA (M). The corresponding Ics values are also available as specified in the technical parameters table.
What residual current (earth leakage) protection settings are available?
The residual operating current (I△n) settings vary by model. For SJKM1LE-125 and -250, non-delay types offer 30/50/100/300/500 mA, while delay types offer 100/300/500 mA. The SJKM1LE-400 supports 100/300/500 mA, and the SJKM1LE-630/800 supports 300/500/1000 mA. The non-operating residual current threshold is 1/2 I△n for all models.
What operation types are supported for the SJKM1LE series?
The SJKM1LE circuit breakers support three operation types: standard manual operation (no suffix), rotary handle operation (suffix Z), and motorized operation (suffix D). The motorized option allows for remote or automated switching, making it suitable for applications where manual access is limited or automatic control is required.
What wiring configurations are available for the SJKM1LE circuit breakers?
The SJKM1LE series supports three wiring configurations: standard rear-panel wiring, plug-in type rear-panel wiring, and front-panel wiring. Each configuration has specific outline and installation dimensions provided in the technical tables, covering both 3-pole and 4-pole versions. Refer to the dimension tables and diagrams in this page for exact measurements per model.

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