High-Quality SJKM1LY Auto Reclosing Molded Case Circuit Breaker Suppliers, Manufacturer
High-Quality SJKM1LY Auto Reclosing Molded Case Circuit Breaker Suppliers, Manufacturer
High-Quality SJKM1LY Auto Reclosing Molded Case Circuit Breaker Suppliers, Manufacturer
High-Quality SJKM1LY Auto Reclosing Molded Case Circuit Breaker Suppliers, Manufacturer
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High-Quality SJKM1LY Auto Reclosing Molded Case Circuit Breaker Suppliers, Manufacturer
High-Quality SJKM1LY Auto Reclosing Molded Case Circuit Breaker Suppliers, Manufacturer
High-Quality SJKM1LY Auto Reclosing Molded Case Circuit Breaker Suppliers, Manufacturer
High-Quality SJKM1LY Auto Reclosing Molded Case Circuit Breaker Suppliers, Manufacturer

High-Quality SJKM1LY Auto Reclosing Molded Case Circuit Breaker Suppliers, Manufacturer

The SJKM1LY Auto Reclosing Molded Case Circuit Breaker is an intelligent all-in-one protection device for TT Grounding systems (AC400V/50Hz), featuring adjustable residual current (50-1000mA), auto-reclosing (20-60s), and multi-function monitoring. With frame currents from 125A to 800A (3P+N), it combines overload, short-circuit, earth fault, and voltage protection in a compact design. This smart breaker offers remote communication (GPRS/PC interface), real-time current display, and fault memory with up to 65kA breaking capacity. Compliant with IEC standards, it ensures reliable operation in utility and industrial grids requiring automated recovery and data tracking.

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Product Description

Type Designation

SJKM1LY-Auto-Reclosing-Molded-Case-Circuit-Breaker-7
1 Manufacturer Code
2 Intelligent Circuit Breaker
3 Design Serial Number
4 With Residual Current Protection
5 Rated Frame Current Level
6 Three-phase Four-wire (3P+N)
7 Function Extension:
None: Economy Type (Overcurrent Non-adjustable)
S: Standard Type (Overcurrent Adjustable)

Product Display

SJKM1LY-Auto-Reclosing-Molded-Case-Circuit-Breaker-(1)
SJKM1LY-Auto-Reclosing-Molded-Case-Circuit-Breaker-(2)
SJKM1LY-Auto-Reclosing-Molded-Case-Circuit-Breaker-(3)
SJKM1LY-Auto-Reclosing-Molded-Case-Circuit-Breaker-(4)
SJKM1LY-Auto-Reclosing-Molded-Case-Circuit-Breaker-(5)
SJKM1LY-Auto-Reclosing-Molded-Case-Circuit-Breaker-(6)

Technical Parameters

Model Specification M1LY-125A M1LY-250A M1LY-400A M1LY-630A M1LY-800A
Number of Poles 3P+N 3P+N 3P+N 3P+N 3P+N
Frame Current (A) 125A 250A 400A 630A 800A
Rated Operational Voltage Ue (V) AC400 50Hz
Rated Insulation Voltage Ui (V) 1000V
Rated Impulse Withstand Voltage Uimp (kV) 8
Arc Distance (mm) ≥50 ≥50 ≥100 ≥100 ≥100
Ultimate Short-circuit Breaking Capacity Icu(kA) 50 50 35 35 65
Service Short-circuit Breaking Capacity Ics(kA) 35 35 25 25 65
Utilization Category B A B B B
Rated Short-time Withstand Current Icw(kA/s) 5kA/0.5s 3kA/1s 5kA/1s 5kA/1s 8kA/1s
Rated Residual Short-circuit Making and Breaking Capacity Icm(kA) ≥5%Icu
Residual Current Operating Characteristics AC Type
Rated Residual Operating Current IΔn 50-1000mA (Adjustable) 50-900mA (Step Adjustable) 50-1000mA (Adjustable)
Auto-reclosing Time (s) 20s-60s
Operating Performance (operations) Energized 1500 1000 1000 1000 500
De-energized 8500 7000 4000 4000 2500
Total Operations 10000 8000 5000 5000 3000
Delay Time (ms) ≤40ms
Communication Delay Time (ms) ≤200ms
Lockout Time 10s-250s

Operating Performance of the Release

1. Overload Protection Characteristics (Inverse Time Delay Operation)
Rated Operating Current of the Release (A) Release (Ambient Temperature 40°C)
1.05In (Cold State) 1.30In (Hot State)
In ≤ 63A No operation for ≥ 1h Operation in < 1h
In > 63A No operation for ≥ 2h Operation in < 2h
Calculation of overload long-delay time: T1 = (6lr/1)² × Tr1
2. Setting Value of Instantaneous Overcurrent Release Current
Rated Current of Integrity Level Inm(A) Rated Current Multiple Conventional Time
100 10 In ± 20% < 0.2s
250 10 In ± 20% < 0.2s
400 10 In ± 20% < 0.2s
630 10 In ± 20% < 0.2s
800 10 In ± 20% < 0.2s

Overall Dimensions and Installation Dimensions

SJKM1LY-5
Model Overall Dimensions (mm) Installation Dimensions (mm) Mounting Screw Cutout Dimensions (mm)
L W H H1 H2 L2 L3 W2 W3 W4 L1 W1
100 Type 231 120 118 62 50 264.6 213.5 30 30 30 211 60 A4×40
250 Type 240.5 141 136.5 83 47.5 300.3 220.1 35.1 35.1 35.1 201.5 70 A4×45
400 Type 335 195 186.5 97.5 83 380.2 303 47.8 47.8 60.3 272 93.5 A5×60
630 Type 355.5 240.5 194.5 105 83 396.6 319.45 58 58 70.5 284 116 A5×65
800 Type 355.5 240.5 194.5 105 83 396.6 319.45 58 58 70.5 284 116 A5×65

Frequently Asked Questions (FAQ)

What does the auto-reclosing function do in this circuit breaker?
The auto-reclosing feature automatically restores electrical power after a temporary fault is detected and cleared, with an auto-reclosing time adjustable between 20s and 60s, significantly reducing maintenance downtime.
What is the difference between the Economy and Standard types?
The Economy Type features a non-adjustable overcurrent protection mechanism, while the Standard Type (designated with 'S') comes equipped with an adjustable overcurrent setting for flexible operation.
What is the rated residual operating current (leakage current) range?
The rated residual operating current (IΔn) ranges from 50mA to 1000mA depending on the frame size, offering both continuous and step adjustment configurations to suit various ground-fault requirements.
How fast is the operational response delay and communication delay?
The delay time during operation is strictly maintained at ≤40ms, while the system's communication delay response operates within ≤200ms for swift monitoring and reporting.
What operational voltages and frequencies are supported by this series?
The series is designed for standard AC400V 50Hz networks, featuring an insulation voltage (Ui) rating of 1000V and an impulse withstand voltage rating of 8kV.

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