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3P+N Auto-Reclosing Smart MCCB Industrial Power Automation
Model SRME1 series smart auto-re-closing with residual current protection circuit breaker (with metering module) rated insulation voltage is 1000V, suitable for AC50/60Hz, rated voltage 400V, rated current to 800A three-phase four-wire neutral point direct ground(TT) distribution network.Used to provide indirect contact protection;To prevent the fire hazard caused by the equipment insulation damage, resulting in ground fault current; And can be used to distribute electrical energy and protect the line from overload and short circuit; It can protect the over-voltage,under-voltage and phase loss of the line. The product meets standards:IEC60947-2《Low Voltage Switchgear and Control equipment》;
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The SRME1 Series 3P+N Auto-Reclosing Smart MCCB is an industrial-grade intelligent molded case circuit breaker with residual current protection and high-precision metering modules. Designed for AC 50/60Hz, 400V three-phase four-wire TT distribution networks with rated current up to 800A, it provides comprehensive protection including indirect contact protection, overload, short circuit, over-voltage, under-voltage, phase loss, and zero break protection. Compliant with IEC60947-2, IEC61008, IEC61009 and IEC62026-1 international standards, it is the core reliable device for professional industrial and municipal power distribution projects.
Core Features & Project-Focused Advantages
Industrial-Grade Three-Stage Protection & Adjustable Leakage Management
This smart auto-reclosing MCCB adopts long-delay, short-delay and instantaneous three-stage electronic tripping protection, independent of power supply voltage. The residual current gear can be adjusted online, with real-time tracking and automatic gear adjustment of line residual current, ensuring the highest power supply continuity and operation reliability for industrial projects.
Intelligent Fault Identification & Customizable Auto-Reclosing
It can accurately identify and record trip types including residual current, overload, short circuit, over-voltage, under-voltage, phase loss and zero break, with fault query and deletion functions. The automatic reclosing time can be freely set between 20s and 60s, which can effectively handle transient faults such as lightning strikes, correct false tripping, and greatly reduce unplanned power outage losses.
Full-Parameter Real-Time Monitoring & Four-Remote Function
Equipped with an LCD English display and user-friendly man-machine interface, it realizes real-time monitoring of line residual current, three-phase power supply voltage, and load current. It fully supports four-remote functions (remote signaling, remote metering, remote control, remote adjustment), which can be seamlessly integrated into industrial SCADA and power distribution automation systems.
High Breaking Capacity & Wide Current Adaptation
With a rated insulation voltage of 1000V and rated impulse withstand voltage of 8kV, this 3P+N industrial smart circuit breaker covers a rated current range of 63A to 800A, with an ultimate short-circuit breaking capacity up to 85kA and rated short-time withstand current up to 10kA/1s, fully adapting to heavy-load industrial application scenarios.
Full Technical Specifications
Specification and model
125
250
400,630
630
800
Bracket rating current(A)
125
250
400,630
630
800
Number of poles
3P+N
3P+N
3P+N
3P+N
3P+N
Rated operating voltage Ue (V)
AC 400/50/60Hz
AC 400/50/60Hz
AC 400/50/60Hz
AC 400/50/60Hz
AC 400/50/60Hz
Rated insulation voltage Ui (V)
1000
1000
1000
1000
1000
Rated impulse withstand voltage Uimp (V)
8000
8000
8000
8000
8000
Arcing distance（mm）
≥50
≥50
≥50
≥100
≥100
Limiting short-circuit breaking capacity Icu (kA)
50 70 (Type H)
50 70 (Type H)
65 85 (Type H)
65 85 (Type H)
65 85 (Type H)
Operating short-circuit breaking capacity Ics (kA)
35 50 (Type H)
35 50 (Type H)
42 55 (Type H)
50 65 (Type H)
42 55 (Type H)
Rated remaining short-circuit making (breaking) capacity
12.5 17.5 (Type H)
12.5 17.5 (Type H)
12.5 17.5 (Type H)
35 50 (Type H)
35 50 (Type H)
Residual current action characteristics
Type AC
Type AC
Type AC
Type AC
Type AC
Rated remaining operating current I△n ( mA )
30/50/75/100/200/300/500/600/800Auto
30/50/75/100/200/300/500/600/800Auto
30/50/75/100/200/300/500/600/800Auto
30/50/100/200/300/400/500/600/800/1000Auto
30/50/100/200/300/400/500/600/800/1000Auto
Rated short-time withstand current Icw ( kA ) /s
3
3
400:5 630:8
8
10
Residual action time characteristics
Delay type/non-delay type
Delay type/non-delay type
Delay type/non-delay type
Delay type/non-delay type
Delay type/non-delay type
Delayed limits do not drive time(s)
0.06/0.1/0.2 selectable:2 I△n
0.06/0.1/0.2 selectable:2 I△n
0.06/0.1/0.2 selectable:2 I△n
0.06/0.1/0.2 selectable:2 I△n
0.06/0.1/0.2 selectable:2 I△n
Breaking time(s)
I△n≤0.5;2 I△n≤0.2;5 I△n≤0.15
I△n≤0.5;2 I△n≤0.2;5 I△n≤0.15
I△n≤0.5;2 I△n≤0.2;5 I△n≤0.15
I△n≤0.5;2 I△n≤0.2;5 I△n≤0.15
I△n≤0.5;2 I△n≤0.2;5 I△n≤0.15
Automatic reclosing time(s)
20-60
20-60
20-60
20-60
20-60
Operating performance (sub) - electrify
1000
1000
1000
1000
500
Operating performance (sub) - No electricity
7000
7000
4000
4000
2500
Operating performance (sub) - Total degree
8000
8000
5000
5000
3000
Overload and short circuit characteristics
Three-stage protection, electronically adjustable, see "Protection Characteristics"
Three-stage protection, electronically adjustable, see "Protection Characteristics"
Three-stage protection, electronically adjustable, see "Protection Characteristics"
Three-stage protection, electronically adjustable, see "Protection Characteristics"
Three-stage protection, electronically adjustable, see "Protection Characteristics"
Over-voltage protection value (V)
Set value (231~330) /Default value 275 V
Set value (231~330) /Default value 275 V
Set value (231~330) /Default value 275 V
Set value (231~330) /Default value 275 V
Set value (231~330) /Default value 275 V
Under-voltage protection value (V)
Set value (88~209) /Default value 145 V
Set value (88~209) /Default value 145 V
Set value (88~209) /Default value 145 V
Set value (88~209) /Default value 145 V
Set value (88~209) /Default value 145 V
Phase loss protection value (V)
Set value (10~130) /Default value 30 V
Set value (10~130) /Default value 30 V
Set value (10~130) /Default value 30 V
Set value (10~130) /Default value 30 V
Set value (10~130) /Default value 30 V
Joint control delay time ( ms )
≤40ms
≤40ms
≤40ms
≤40ms
≤40ms
Communication delay time (ms)
≤200ms
≤200ms
≤200ms
≤200ms
≤200ms
Target Industries & Application Scenarios
Power Grid & Distribution Automation: Overhead distribution lines, regional distribution networks, working with isolators to automatically isolate faulty sections and restore power supply to non-faulty areas, reducing power outage scope and duration.
Industrial Manufacturing & Heavy-Duty Facilities: Factories, production lines, mining facilities, and large-scale equipment rooms, providing sequential start-stop protection to avoid inrush current damage, and realizing refined energy management for heavy loads.
Municipal Engineering & Public Infrastructure: Urban streetlights, new energy charging stations, transportation hubs, water conservancy facilities, and sewage treatment plants, enabling remote operation and maintenance, fault alarm, and unattended management.
High Reliability Power Supply Scenarios: Data centers, hospitals, large commercial complexes, and emergency power supply systems, quickly restoring power after transient faults, correcting false tripping, and improving power system stability.
New Energy & Distributed Generation: Photovoltaic power stations, wind power projects, and distributed energy systems, providing reliable protection for grid connection, adapting to new energy operation characteristics, and ensuring grid connection safety.
Product Operate Guide
Installation & Power-On: Complete the 3P+N main circuit wiring, fix the device in the power distribution cabinet, confirm the insulation test is qualified, then power on the device and wait for the LCD screen to enter the operation interface.
Working Mode Switching: Use the Auto/Manual button to switch working modes; the automatic mode enables full protection functions for formal operation, and the manual mode is used for on-site debugging.
On-Site Function Debugging: Complete basic function tests via the Open, Close, and Test buttons; enter the setting menu through the Setting button, and configure protection parameters, action time, and auto-reclosing time via the up/down, Confirm and Back buttons.
Remote System Integration: Connect the device to the SCADA/DCS system via the matching communication module, configure the four-remote functions, and realize remote monitoring, control and parameter adjustment.
Fault Management: Press the Confirm button on the operation interface to query fault records, and complete fault data export and clearing to optimize the distribution protection strategy according to actual operation conditions.
FAQ
Can this industrial smart MCCB be used in 400V three-phase four-wire distribution networks with rated current up to 800A?
Yes, the SRME1 series covers a rated current range of 63A to 800A, which is fully suitable for AC 400V 50/60Hz three-phase four-wire TT distribution networks in industrial, municipal and large commercial projects.
What comprehensive protection functions does this auto-reclosing smart MCCB provide?
It provides full protection including residual current (leakage) protection, overload protection, short circuit protection, over-voltage protection, under-voltage protection, phase loss protection and zero break protection, with intelligent fault identification and recording functions.
Does this smart molded case circuit breaker support remote management for industrial distribution automation?
Yes, it fully supports four-remote functions (remote signaling, remote metering, remote control, remote adjustment), which can be seamlessly integrated with mainstream SCADA, DCS and power distribution automation systems for unattended management.
Is the auto-reclosing time of the product adjustable?
Yes, the automatic reclosing time can be freely set between 20s and 60s according to the actual needs of the project, which can effectively handle transient faults and reduce the economic losses caused by unplanned power outages.
