SF219G Changeover Switch | Dual Power Manual Transfer Switch
SF219G Changeover Switch | Dual Power Manual Transfer Switch
1P
$1.5
2P
$3
3P
$4.5
4P
$6
Model: SF219G
Type: I-0-II Three-position manual changeover switch (ON-OFF-ON)
Number of poles: 1P/2P/3P/4P
Rated current: 10/16/20/25/32/40/63A
Rated voltage: AC 230V/400V (≤400V)
Frequency: 50/60Hz
Standard: IEC 60947-3, CE
Installation: DIN rail mounting
1P
$1.5
2P
$3
3P
$4.5
4P
$6
Model: SF219G
Type: I-0-II Three-position manual changeover switch (ON-OFF-ON)
Number of poles: 1P/2P/3P/4P
Rated current: 10/16/20/25/32/40/63A
Rated voltage: AC 230V/400V (≤400V)
Frequency: 50/60Hz
Standard: IEC 60947-3, CE
Installation: DIN rail mounting
1. Product Overview
SF219G modular dual power isolating switch is compact DIN-rail type manual transfer switch specially designed for low voltage dual-power distribution system. This series covers 1 pole, 2 pole,3 pole and 4 pole specifications with standard rated 63A,400V AC, applied to manually switch between utility mains power and backup generator or UPS power supply.
Built with reliable mechanical interlock structure, the switch strictly avoids simultaneous connection of two incoming power sources to eliminate short circuit risk. Featuring high temperature flame retardant plastic casing and reinforced operating handle, it is widely used in household distribution boxes, small commercial power panels, fire control auxiliary power and industrial equipment backup power control.
2. Key Features
- Complete Pole Options: Available in 1P/2P/3P/4P four specifications to match single-phase and three-phase distribution systems.
- Safe Mechanical Interlock: Built-in interlock mechanism, can’t connect two power sources at the same time to prevent cross short-circuit.
- DIN Rail Modular Design: Standard 35mm DIN rail mounting, quick installation inside distribution cabinet, space-saving modular size.
- Thickened Operation Handle: Reinforced anti-break handle for comfortable and stable manual switching operation.
- Flame Retardant Enclosure: UL94-V0 fire-resistant shell, high temperature resistant and anti-aging for long service life.
- Standard 63A/400VAC Rating: Universal rated parameter fits most civil and light industrial dual power switching scenarios.
- CE & IEC Certified: Comply with IEC60947-3 international standard with CE certification for global market.
3. Technical Specifications
| Parameter | Specification |
|---|---|
| Model | SF219G Series Dual Power Isolation Switch |
| Pole Options | 1P / 2P /3P /4P |
| Rated Current | 63A |
| Rated Voltage | 400V AC,50/60Hz |
| Mounting | 35mm Standard DIN Rail |
| Operation Mode | Manual rotary/lever changeover |
| Core Protection | Mechanical interlock anti double-source closing |
| Shell Material | Flame retardant engineering plastic |
| Execution Standard | IEC60947-3, CE Certified |
| Ambient Temperature | -25℃ ~ +65℃ |
4. Working Principle
- Main Power Working State: Switch handle stays on main power side, load is powered by utility mains, standby power circuit is fully isolated.
- Power Cut-off Maintenance: When mains fails or needs maintenance, manually toggle handle to standby position, load switches to backup generator/UPS power supply, main power side disconnects completely.
- Interlock Protection: Internal mechanical structure locks the opposite contact when one side is closed, two power paths cannot conduct simultaneously to avoid short-circuit accident.
5. Application Range
- Household power distribution: Home backup UPS, solar off-grid system manual power switching
- Commercial buildings: Small shop, office lighting & equipment dual power control
- Fire fighting auxiliary: Fire pump, emergency lighting manual backup power switch
- Industrial equipment: Small motor, automation instrument standby power distribution
- Communication equipment: Monitoring cabinet, small base station dual-source power control
6. Installation & Operation Guide
- Mounting: Snap the switch onto standard 35mm DIN rail inside distribution box, fix firmly to avoid loose shaking.
- Wiring: Connect main incoming power to upper left terminals, standby power to upper right terminals, load wire to bottom outgoing terminals.
- Operation Check: Toggle handle between two positions repeatedly to confirm smooth switching and interlock function works normally.
- Safety Notice: Do not hot-line wiring; cut off both two power sources before any maintenance work.
7. Installation dimensions
8. FAQ
Q1: Can this switch automatically switch power?
No, this is manual dual power changeover switch; it needs manual toggle to switch between main and backup power, different from ATS automatic transfer switch.
Q2: What’s the max rated current of this series?
Standard stock rated current is 63A; customized current specifications can be supported upon customer request.
Q3: Is mechanical interlock reliable?
Yes, built-in all-mechanical interlock structure ensures two power circuits never close together, safe for dual-source distribution.
Q4: Can it install outdoors directly?
The switch itself is indoor IP20 grade, must be fitted inside sealed waterproof cabinet for outdoor installation.
Q5: Does this product pass CE certification?
All LW series dual power isolation switches have passed CE certification and comply with IEC60947-3 international standard.
9. Technical Documents & Support
Download the full datasheet for detailed specifications, wiring diagrams, and trip coordination guidelines.
Contact our engineering team for custom configurations, communication module integration, or OEM solutions for large-scale projects.
Request a quote with your project details for bulk pricing, lead times, and compliance certifications.
1. Product Overview
SF219G modular dual power isolating switch is compact DIN-rail type manual transfer switch specially designed for low voltage dual-power distribution system. This series covers 1 pole, 2 pole,3 pole and 4 pole specifications with standard rated 63A,400V AC, applied to manually switch between utility mains power and backup generator or UPS power supply.
Built with reliable mechanical interlock structure, the switch strictly avoids simultaneous connection of two incoming power sources to eliminate short circuit risk. Featuring high temperature flame retardant plastic casing and reinforced operating handle, it is widely used in household distribution boxes, small commercial power panels, fire control auxiliary power and industrial equipment backup power control.
2. Key Features
- Complete Pole Options: Available in 1P/2P/3P/4P four specifications to match single-phase and three-phase distribution systems.
- Safe Mechanical Interlock: Built-in interlock mechanism, can’t connect two power sources at the same time to prevent cross short-circuit.
- DIN Rail Modular Design: Standard 35mm DIN rail mounting, quick installation inside distribution cabinet, space-saving modular size.
- Thickened Operation Handle: Reinforced anti-break handle for comfortable and stable manual switching operation.
- Flame Retardant Enclosure: UL94-V0 fire-resistant shell, high temperature resistant and anti-aging for long service life.
- Standard 63A/400VAC Rating: Universal rated parameter fits most civil and light industrial dual power switching scenarios.
- CE & IEC Certified: Comply with IEC60947-3 international standard with CE certification for global market.
3. Technical Specifications
| Parameter | Specification |
|---|---|
| Model | SF219G Series Dual Power Isolation Switch |
| Pole Options | 1P / 2P /3P /4P |
| Rated Current | 63A |
| Rated Voltage | 400V AC,50/60Hz |
| Mounting | 35mm Standard DIN Rail |
| Operation Mode | Manual rotary/lever changeover |
| Core Protection | Mechanical interlock anti double-source closing |
| Shell Material | Flame retardant engineering plastic |
| Execution Standard | IEC60947-3, CE Certified |
| Ambient Temperature | -25℃ ~ +65℃ |
4. Working Principle
- Main Power Working State: Switch handle stays on main power side, load is powered by utility mains, standby power circuit is fully isolated.
- Power Cut-off Maintenance: When mains fails or needs maintenance, manually toggle handle to standby position, load switches to backup generator/UPS power supply, main power side disconnects completely.
- Interlock Protection: Internal mechanical structure locks the opposite contact when one side is closed, two power paths cannot conduct simultaneously to avoid short-circuit accident.
5. Application Range
- Household power distribution: Home backup UPS, solar off-grid system manual power switching
- Commercial buildings: Small shop, office lighting & equipment dual power control
- Fire fighting auxiliary: Fire pump, emergency lighting manual backup power switch
- Industrial equipment: Small motor, automation instrument standby power distribution
- Communication equipment: Monitoring cabinet, small base station dual-source power control
6. Installation & Operation Guide
- Mounting: Snap the switch onto standard 35mm DIN rail inside distribution box, fix firmly to avoid loose shaking.
- Wiring: Connect main incoming power to upper left terminals, standby power to upper right terminals, load wire to bottom outgoing terminals.
- Operation Check: Toggle handle between two positions repeatedly to confirm smooth switching and interlock function works normally.
- Safety Notice: Do not hot-line wiring; cut off both two power sources before any maintenance work.
7. Installation dimensions
8. FAQ
Q1: Can this switch automatically switch power?
No, this is manual dual power changeover switch; it needs manual toggle to switch between main and backup power, different from ATS automatic transfer switch.
Q2: What’s the max rated current of this series?
Standard stock rated current is 63A; customized current specifications can be supported upon customer request.
Q3: Is mechanical interlock reliable?
Yes, built-in all-mechanical interlock structure ensures two power circuits never close together, safe for dual-source distribution.
Q4: Can it install outdoors directly?
The switch itself is indoor IP20 grade, must be fitted inside sealed waterproof cabinet for outdoor installation.
Q5: Does this product pass CE certification?
All LW series dual power isolation switches have passed CE certification and comply with IEC60947-3 international standard.
9. Technical Documents & Support
Download the full datasheet for detailed specifications, wiring diagrams, and trip coordination guidelines.
Contact our engineering team for custom configurations, communication module integration, or OEM solutions for large-scale projects.
Request a quote with your project details for bulk pricing, lead times, and compliance certifications.
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