LMGLZ1 Changeover Isolating Switch | 63A to 3150A Manual Transfer Switch
LMGLZ1 Changeover Isolating Switch | 63A to 3150A Manual Transfer Switch
The LMGLZ1 series manual changeover isolating switch covers complete current specifications from 63A up to 3150A in 4-pole three-phase four-wire design for 400V AC systems. Each model adopts thick pure copper busbar terminals, mechanical interlock two-position handle and flame-retardant insulation housing, supporting safe manual dual power switching and full visible circuit isolation for maintenance. Compliant with IEC60947-3 standards, this heavy-duty isolator is widely used in commercial buildings, industrial factories, photovoltaic power stations and generator backup power distribution cabinets.
The LMGLZ1 series manual changeover isolating switch covers complete current specifications from 63A up to 3150A in 4-pole three-phase four-wire design for 400V AC systems. Each model adopts thick pure copper busbar terminals, mechanical interlock two-position handle and flame-retardant insulation housing, supporting safe manual dual power switching and full visible circuit isolation for maintenance. Compliant with IEC60947-3 standards, this heavy-duty isolator is widely used in commercial buildings, industrial factories, photovoltaic power stations and generator backup power distribution cabinets.
1. Product Overview
The LMGLZ1 series changeover isolating switch is a full-series heavy-duty manual transfer disconnector designed for low-voltage 400V AC three-phase four-wire power distribution systems. The complete product line covers rated current grades from small 63A all the way up to large industrial 3150A, unified 4-pole A/B/C+N full isolation structure to match light commercial, medium factory and heavy industrial main power distribution scenarios.
Each model integrates dual core functions: manual switching between two independent power sources and full-circuit visible isolation for safe equipment overhaul. Equipped with reinforced mechanical interlock operation handle, high-conductivity thick copper terminals and high flame-retardant insulated housing, all products pass IEC60947-3 standard temperature rise, breaking capacity and mechanical endurance tests. It is the ideal main circuit isolation & dual power switching equipment for distribution cabinets, pump stations, solar energy systems and backup generator rooms.
2. Core Product Features
1. Full Wide Current Range: 63A ~ 3150A Complete Grades
Full segmented current specifications cover all common low-voltage distribution loads:
63A / 100A / 160A / 200A / 250A / 400A / 630A / 800A / 1000A / 1250A / 1600A / 2000A / 2500A / 3150A
- Small grades (63A–250A): Commercial buildings, small workshop branch distribution
- Medium grades (400A–1250A): Factory main cabinets, HVAC, photovoltaic combiner boxes
- Large grades (1600A–3150A): Heavy industry, data center, power station main incoming switches
2. 4-Pole Full Three-Phase + Neutral Isolation
3. Mechanical Interlock Two-Position Safety Handle
- Position I (ON): First power supply operation
- Position O (OFF): Full circuit isolation, safe maintenance state
- Position II (ON): Second power supply operation
Built-in mechanical anti-misoperation interlock prevents accidental power-on during overhaul; heavy-current large models adopt reinforced long handle for labor-saving stable switching without contact bounce.
4. Thickened Pure Copper Busbar Terminals (Size Matched Per Current Grade)
- Small current (63–250A): Standard copper lugs for cables & small busbars
- Medium & large current (400–3150A): Oversized thick copper busbar terminals, compatible with thick copper busbars
All terminals adopt anti-oxidation silver plating, ultra-low contact resistance, minimal temperature rise under long-term full-load continuous operation, avoiding overheating burnout under heavy load.
5. Optimized Arc Extinguishing & Load Break Performance
6. High-Grade Flame-Retardant Integrated Housing
7. National Standard Certification & Stable Industrial Adaptability
3. Working Conditions
- Ambient operating temperature: -10℃ ~ +55℃
- Protection Grade: IP20, only installed inside fully enclosed indoor distribution cabinets; NOT for outdoor exposed, splash or humid environments
- Surrounding atmosphere: Free of corrosive gas, flammable dust and conductive metal particles
- Altitude: Stable rated performance below 2000 meters above sea level
- Vibration resistance: Withstand normal workshop mechanical vibration; avoid continuous strong impact
- Humidity: Relative humidity ≤85%, no condensation inside the switch housing
4. Unified General Technical Specifications
| Parameter | Unified Specification |
|---|---|
| Product Model | LMGL-Z1 |
| Rated Current Range | 63A ~ 3150A segmented full grades |
| Poles | 3P / 4P (3 live phases + Neutral N line) |
| Rated Operating Voltage | 400V AC 50Hz |
| Operation Positions | I (First power supply) / O (OFF full isolation) / II (Second power supply) |
| Terminal Material | Thickened silver-plated pure copper (size matched per current grade) |
| Housing Material | Flame-retardant high-strength bakelite/engineering plastic |
| Compliance Standard | IEC60947-3 |
| Mechanical Endurance | ≥10,000 switching cycles (small grades); ≥5,000 cycles (1600A–3150A large grades) |
| Mounting Mode | Fixed base mounting inside low-voltage distribution cabinet |
| Core Functions | Manual dual power transfer, full visible circuit isolation, rated load break protection |
5. Typical Applications
- Industrial factory main incoming distribution cabinets (630A~3150A large current models)
- Commercial buildings, shopping malls, office building dual power switching cabinets
- Water pump stations, central air conditioning HVAC control distribution panels
- Solar PV power stations, wind energy off-grid/grid-tied distribution systems
- Backup diesel generator room manual power transfer switches
- Data center, hospital, chemical plant uninterruptible power distribution equipment
- Small workshop, agricultural facility branch power isolation switches (63A–250A)
6. Frequently Asked Questions (FAQ)
1. What does 4P mean for LMGLZ1 series?
2. Is this an automatic transfer switch (ATS)?
3. How to select the correct current model from 63A~3150A?
4. Can large current models (1600A–3150A) connect directly to copper busbars?
5. Can the switch be installed outdoors?
6. Is the OFF position compliant with electrical safety isolation standards?
7. Technical documentation and support
Download the full datasheet for detailed specifications, wiring diagrams and trip coordination guides.
Please contact our technical team for custom configuration or OEM/ODM solutions for your project.
Request a quote with details about your project for volume pricing, lead times, and compliance certifications.
1. Product Overview
The LMGLZ1 series changeover isolating switch is a full-series heavy-duty manual transfer disconnector designed for low-voltage 400V AC three-phase four-wire power distribution systems. The complete product line covers rated current grades from small 63A all the way up to large industrial 3150A, unified 4-pole A/B/C+N full isolation structure to match light commercial, medium factory and heavy industrial main power distribution scenarios.
Each model integrates dual core functions: manual switching between two independent power sources and full-circuit visible isolation for safe equipment overhaul. Equipped with reinforced mechanical interlock operation handle, high-conductivity thick copper terminals and high flame-retardant insulated housing, all products pass IEC60947-3 standard temperature rise, breaking capacity and mechanical endurance tests. It is the ideal main circuit isolation & dual power switching equipment for distribution cabinets, pump stations, solar energy systems and backup generator rooms.
2. Core Product Features
1. Full Wide Current Range: 63A ~ 3150A Complete Grades
Full segmented current specifications cover all common low-voltage distribution loads:
63A / 100A / 160A / 200A / 250A / 400A / 630A / 800A / 1000A / 1250A / 1600A / 2000A / 2500A / 3150A
- Small grades (63A–250A): Commercial buildings, small workshop branch distribution
- Medium grades (400A–1250A): Factory main cabinets, HVAC, photovoltaic combiner boxes
- Large grades (1600A–3150A): Heavy industry, data center, power station main incoming switches
2. 4-Pole Full Three-Phase + Neutral Isolation
3. Mechanical Interlock Two-Position Safety Handle
- Position I (ON): First power supply operation
- Position O (OFF): Full circuit isolation, safe maintenance state
- Position II (ON): Second power supply operation
Built-in mechanical anti-misoperation interlock prevents accidental power-on during overhaul; heavy-current large models adopt reinforced long handle for labor-saving stable switching without contact bounce.
4. Thickened Pure Copper Busbar Terminals (Size Matched Per Current Grade)
- Small current (63–250A): Standard copper lugs for cables & small busbars
- Medium & large current (400–3150A): Oversized thick copper busbar terminals, compatible with thick copper busbars
All terminals adopt anti-oxidation silver plating, ultra-low contact resistance, minimal temperature rise under long-term full-load continuous operation, avoiding overheating burnout under heavy load.
5. Optimized Arc Extinguishing & Load Break Performance
6. High-Grade Flame-Retardant Integrated Housing
7. National Standard Certification & Stable Industrial Adaptability
3. Working Conditions
- Ambient operating temperature: -10℃ ~ +55℃
- Protection Grade: IP20, only installed inside fully enclosed indoor distribution cabinets; NOT for outdoor exposed, splash or humid environments
- Surrounding atmosphere: Free of corrosive gas, flammable dust and conductive metal particles
- Altitude: Stable rated performance below 2000 meters above sea level
- Vibration resistance: Withstand normal workshop mechanical vibration; avoid continuous strong impact
- Humidity: Relative humidity ≤85%, no condensation inside the switch housing
4. Unified General Technical Specifications
| Parameter | Unified Specification |
|---|---|
| Product Model | LMGL-Z1 |
| Rated Current Range | 63A ~ 3150A segmented full grades |
| Poles | 3P / 4P (3 live phases + Neutral N line) |
| Rated Operating Voltage | 400V AC 50Hz |
| Operation Positions | I (First power supply) / O (OFF full isolation) / II (Second power supply) |
| Terminal Material | Thickened silver-plated pure copper (size matched per current grade) |
| Housing Material | Flame-retardant high-strength bakelite/engineering plastic |
| Compliance Standard | IEC60947-3 |
| Mechanical Endurance | ≥10,000 switching cycles (small grades); ≥5,000 cycles (1600A–3150A large grades) |
| Mounting Mode | Fixed base mounting inside low-voltage distribution cabinet |
| Core Functions | Manual dual power transfer, full visible circuit isolation, rated load break protection |
5. Typical Applications
- Industrial factory main incoming distribution cabinets (630A~3150A large current models)
- Commercial buildings, shopping malls, office building dual power switching cabinets
- Water pump stations, central air conditioning HVAC control distribution panels
- Solar PV power stations, wind energy off-grid/grid-tied distribution systems
- Backup diesel generator room manual power transfer switches
- Data center, hospital, chemical plant uninterruptible power distribution equipment
- Small workshop, agricultural facility branch power isolation switches (63A–250A)
6. Frequently Asked Questions (FAQ)
1. What does 4P mean for LMGLZ1 series?
2. Is this an automatic transfer switch (ATS)?
3. How to select the correct current model from 63A~3150A?
4. Can large current models (1600A–3150A) connect directly to copper busbars?
5. Can the switch be installed outdoors?
6. Is the OFF position compliant with electrical safety isolation standards?
7. Technical documentation and support
Download the full datasheet for detailed specifications, wiring diagrams and trip coordination guides.
Please contact our technical team for custom configuration or OEM/ODM solutions for your project.
Request a quote with details about your project for volume pricing, lead times, and compliance certifications.
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