LMS1-SA Integrated 3‑Position Automatic Transfer Switch

Product Overview

The LMS1-SA series automatic transfer switch (ATS) is an all‑in‑one intelligent dual‑power switching device, integrating power switching body and built‑in intelligent controller in one unit. It monitors both main power and standby power sources, and automatically transfers load between them when power failure or recovery occurs.

The unique 3‑position design (Main‑OFF‑Standby) provides a central disconnection position, ensuring complete electrical isolation between two power sources with break‑before‑make logic, avoiding parallel connection risk. 4‑pole configuration includes neutral pole switching, suitable for 3‑phase 4‑wire low‑voltage distribution systems. It is widely applied in data centers, commercial buildings, industrial plants, hospitals and communication facilities where uninterrupted power supply is required.

Key Product Features

✅ Integrated 3‑Position Safety Design Main‑OFF‑Standby three positions with break‑before‑make logic. Central OFF position achieves full galvanic isolation between two power sources, eliminating parallel connection risk and ensuring maintenance safety.

✅ Built‑in Intelligent Controller All‑in‑one design with integrated control module, no extra external controller needed. Reduces cabinet wiring work, saves installation space and lowers system failure points.

✅ Auto / Manual Dual Operation Modes Supports fully automatic unattended switching and manual operation for commissioning & maintenance. One‑button manual closing for both main and standby power.

✅ Complete Status Indication & Control Intuitive LED indicators for main power, standby power, closing status and fault alarm. Equipped with main closing, standby closing and double‑point control buttons for flexible on‑site operation.

✅ 4‑pole Full Circuit Switching 4‑pole configuration switches all 3 phases and neutral line, suitable for TN‑S, TN‑C‑S 3‑phase 4‑wire systems, avoids neutral drift issues.

✅ High Breaking & Short‑time Withstand Capacity Rated for AC‑33B utilization category, reliable load switching performance and short‑circuit withstand capability for industrial power systems.

✅ Compliant with IEC 60947‑6‑1 Manufactured and tested according to international ATS standard, CE compliant, suitable for global critical power projects.

Technical Specifications

Application Scenarios

• Mains to generator automatic backup power systems
• Data centers, server rooms and IT infrastructure power distribution
• Hospitals, commercial buildings and public facilities uninterrupted power supply
• Industrial plant production line critical load switching
• Communication base stations and telecom power systems
• Fire safety, elevator and emergency lighting power systems

Our Advantages

1. All‑in‑one integrated design Built‑in controller removes need for separate control unit, simplifies cabinet wiring, reduces installation labor and system failure points.
2. Genuine 3‑position safety structure Central OFF position provides true galvanic isolation between two sources, safer than ordinary 2‑position ATS.
3. Stable and reliable control logic Mature built‑in control algorithm, accurate voltage detection, anti‑false‑trip design for grid fluctuation, suitable for complex on‑site power environment.
4. Strict full‑function factory testing Each unit undergoes power switching test, withstand voltage test and mechanical life test before delivery to guarantee on‑site reliability.
5. Complete project technical support Provide dimension drawings, wiring diagrams, ATS selection guides and test reports for project design and tender bidding. Fast overseas technical response.

Custom Solution

We provide project‑oriented custom solutions for LMS1-SA automatic transfer switch:

• OEM Brand Customization: Custom silk‑screen logo, model marking and label design for distributor branded resale.
• Current & Pole Configuration: Offer different current ratings and 2P/3P/4P options to match specific project requirements.
• Control Logic Customization: Adjust switching delay, voltage threshold and control logic for special power system demands.
• Export‑grade Custom Packing: Neutral carton, customer‑branded carton, seaworthy reinforced packing for long‑distance sea transportation.
• Project‑level Technical Service: Supply CAD drawings, wiring schematics and test certificates for bidding and local project approval.
• Large‑volume Priority Production: Priority production schedule for large infrastructure and power project orders.

Share your project power parameters and switching requirements, our engineers will recommend the optimal ATS solution within 24 working hours.

FAQ

Q1: What does 3‑position ATS mean?

A: 3‑position ATS has three switch states: Main power ON, central OFF, Standby power ON. It adopts break‑before‑make logic, ensuring two power sources are never connected in parallel, and provides full isolation for safe maintenance.

Q2: Does this ATS need an external controller?

A: No. LMS1-SA adopts integrated design with built‑in intelligent controller. No extra external control unit is required, which simplifies installation and wiring.

Q3: Can I operate the switch manually?

A: Yes, it supports both automatic and manual modes. You can switch to manual mode for commissioning, testing or maintenance operation via front panel buttons.

Q4: Does 4‑pole ATS switch the neutral line?

A: Yes, 4‑pole configuration switches all three phase lines and the neutral line together, suitable for 3‑phase 4‑wire systems and avoiding neutral voltage drift.

Q5: What standard does this ATS comply with?

A: It is designed and tested according to IEC 60947‑6‑1 international standard for automatic transfer switch equipment.

Q6: Do you support OEM private‑label service for distributors?

A: Yes, logo and label customization is available, certain MOQ is required for OEM service.

Q7: Can this ATS be used for generator standby systems?

A: Yes, it is widely used for mains‑generator automatic changeover systems, and can be matched with generator control signals.