Intro

Most standard over under voltage protectors on the market use 1P+N design. They only trip the live line while the neutral wire remains connected to the grid. In floating neutral or grid imbalance faults, neutral may carry dangerous residual voltage, creating hidden electric shock risks even after the device trips.

Our LMGQ6 2P over under voltage protector is built with synchronized double-break contacts. When overvoltage or undervoltage is detected, it disconnects both live (L) and neutral (N) conductors at the same time. The downstream circuit is fully isolated from the mains supply. It is a safer upgrade for home distribution panels, solar PV inverters, battery energy storage and off-grid power installations.

What Makes This 2P Model Different

Conventional 1P+N voltage protectors only switch live. Neutral stays linked to the utility supply. This leaves residual voltage on your load side, which can damage sensitive electronics and shock technicians during cabinet maintenance.

This 2P over under voltage protector uses mechanically linked dual contacts. L and N open simultaneously upon abnormal voltage. No residual voltage remains on the output terminals.

• DIN rail 35mm modular design, fits standard distribution boxes
• Auto-reclosing delay: power restores only after voltage stabilizes for preset time, preventing repeated switching shocks
• Real-time voltage monitoring, fast trip response
• Flame retardant housing, CE compliant for low voltage distribution

Key Advantages of 2P L+N Simultaneous Disconnection

1. Complete Galvanic Isolation, Zero Residual Voltage Hazard

This is the biggest difference from 1P+N variants. When the protector trips, both live and neutral are disconnected. The whole downstream wiring and connected appliances are fully separated from grid power.

For electricians doing inspection or maintenance inside the distribution cabinet, full isolation drastically reduces touch voltage and electric shock risks. Even under floating neutral grid faults, there will be no unexpected voltage on load terminals.

2. Better Protection for Solar Inverters & Energy Storage Equipment

PV inverters, battery BMS and charge controllers are highly sensitive to unstable voltage and residual potential. Partial disconnection from 1P+N protectors may send distorted signals to inverter control boards, triggering false alarms or permanent component burnout.

With 2P full cut-off, abnormal power feed stops instantly once voltage goes out of range. It is widely recommended for grid-tied solar systems, off-grid cabins and mini-grid projects where equipment replacement cost is high.

3. Protect Household Appliances Against Burnout from Voltage Fluctuations

Long undervoltage causes motors inside compressors, pumps and air conditioners to draw excess current and overheat. Sudden overvoltage spikes destroy capacitors and circuit boards in refrigerators, TVs and kitchen devices.

This 2P protector continuously tracks supply voltage. Once voltage crosses the preset upper or lower threshold, it cuts L and N immediately, stopping unsafe power from reaching your loads and lowering repair costs.

4. Lower Hidden Fire Risks

Unstable voltage creates continuous overheating on wiring terminals and appliance PCBs. 1P+N devices cannot fully eliminate abnormal potential under fault conditions.

By disconnecting both conductors, this 2P model terminates abnormal power supply completely during faults, reducing long-term overheating and fire hazards caused by grid voltage fluctuation.

5. Meets Strict Wiring Safety Requirements

Many electrical codes and solar installation standards require disconnection of all live conductors for safety-critical circuits. This 2P over under voltage protector satisfies full isolation requirements, simplifying site inspection and compliance checks for contractors and importers.

Where to Install the 2P Over Under Voltage Protector

• Residential main incoming power protection
• Grid-tied and off-grid solar PV & battery storage systems
• Remote houses, cabins and off-grid mini-grids
• Small commercial lighting and water pump circuits
• Auxiliary protection for EV charging circuits
• Unattended industrial and telecom equipment

Quick Comparison: 2P (L+N break) vs 1P+N (Only live break)

1P+N: Only live trips, neutral remains connected. Residual voltage risk. Not ideal for solar and maintenance-heavy panels. 2P: Live and neutral cut off synchronously. Full isolation. No residual voltage at load side. Best choice for PV, main home supply and high safety requirement projects.

Who Should Buy This 2P Over Under Voltage Protector

• Solar installers for residential and commercial PV projects
• Electrical contractors upgrading distribution boards
• Electrical importers sourcing low voltage protection components
• Home and property owners in regions with unstable grid power
• Any project requiring full circuit isolation during voltage faults

Final Words

1P+N over under voltage protectors offer basic protection, but they cannot achieve real full isolation. If safety and equipment protection are your priority, choose our 2P over under voltage protector with simultaneous live and neutral disconnection. It removes residual voltage dangers, protects expensive inverters and appliances, and lifts your electrical system to a higher safety standard.