LMS2-125GA 4P 125A PC Class Automatic Transfer Switch (ATSE)

Product Overview

The LMS2-125GA series PC class automatic transfer switch is a professional dual-power switching device for low-voltage 3-phase 4-wire distribution systems. It continuously monitors both main and standby power sources, and automatically transfers the load between them upon power failure or recovery, ensuring uninterrupted power supply for critical loads.

This 125A 4-pole model features PC-class isolation performance with strict break-before-make switching logic, providing full galvanic isolation between two power sources, which meets the safety requirements for maintenance and fault isolation. It supports both fully automatic operation and manual operation mode, with clear status indicators for intuitive on-site monitoring. Compliant with IEC 60947-6-1 international standard, it is widely applied in industrial plants, commercial buildings, data centers, hospitals and communication base stations.

Key Product Features

✅ PC Class Isolation Performance PC-level power circuit class ATS with dedicated isolation contacts, providing true galvanic isolation between two power sources. Meets strict maintenance lockout requirements and eliminates parallel connection risk, safer than ordinary CB-class ATS for maintenance scenarios.

✅ Auto / Manual Dual Operation Modes Supports fully automatic unattended switching for daily operation, and manual mode for commissioning, testing and maintenance. Mode selection switch on the front panel enables quick and intuitive mode switching.

✅ 4-Pole Full Circuit Switching Switches all 3 phase conductors and neutral line simultaneously, suitable for 3-phase 4-wire systems, eliminating neutral voltage drift and ensuring complete circuit isolation for maintenance safety.

✅ High Short-Circuit Withstand Performance AC-33B utilization category, 17kA rated short-circuit making capacity and 10kA/30ms short-time withstand capacity, 8kV rated impulse withstand voltage, reliable performance for industrial power systems with high fault current.

✅ Clear Status Indication Integrated LED status indicators for power supply I status, power supply II status, closing status and fault alarm. Operators can clearly identify current switching status and working mode at a glance.

✅ Compact Panel Mount Design Modular compact structure, designed for fixed installation inside distribution cabinets and power panels. Standard mounting dimensions, saving cabinet space and easy for wiring and maintenance.

✅ IEC 60947-6-1 International Standard Manufactured and tested in full compliance with IEC 60947-6-1 and GB/T 14048.11 standards for automatic transfer switching equipment, qualified for global dual-power projects.

Technical Specifications

Application Scenarios

• Mains to generator automatic backup power systems
• Industrial plant production line critical load power switching
• Commercial buildings, shopping malls and office building emergency power supply
• Data centers, server rooms and IT infrastructure dual power systems
• Hospitals, fire fighting systems and elevator emergency power switching
• Communication base stations and telecom facility uninterrupted power systems

Our Advantages

1. Genuine PC class isolation performance Strict break-before-make structure provides true galvanic isolation between two power sources, meeting professional PC class ATS requirements, safer than ordinary CB class ATS for maintenance scenarios.
2. Mature and reliable control logic Stable built-in control algorithm, accurate voltage detection, anti-false trip design for grid voltage fluctuation, suitable for complex on-site power environments.
3. Strict full-function factory testing Each unit undergoes power switching test, withstand voltage test, mechanical life test and short-circuit withstand verification before delivery to guarantee on-site reliability.
4. Standard size for easy replacement Standard mounting dimensions and terminal layout, compatible with mainstream PC class ATSE on the market, can be directly replaced without cabinet modification.
5. Complete project technical support Provide dimension drawings, wiring diagrams, ATS selection guides and test certificates for project design and tender bidding. Fast overseas technical response.

Custom Solution

We provide project-oriented custom solutions for LMS2 PC class 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 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 is PC class ATSE? What is the difference from CB class?

A: PC class (Power Circuit class) ATSE is isolation-grade transfer switch with dedicated isolation contacts, providing full galvanic isolation between two power sources. CB class ATS is based on circuit breaker structure, mainly for protection and switching. PC class has better isolation performance and is more suitable for scenarios requiring maintenance isolation.

Q2: What operation modes does this ATSE support?

A: It supports both automatic and manual operation modes. In automatic mode, it monitors power sources and switches unattended. In manual mode, it can be operated manually for commissioning, testing and maintenance.

Q3: Does 4-pole ATSE 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 issues.

Q4: What standard does this ATSE comply with?

A: It is designed and tested according to IEC 60947-6-1 international standard and GB/T 14048.11 standard for automatic transfer switching equipment.

Q5: Do you support OEM private-label service for distributors?

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

Q6: Can this ATSE 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.

Q7: What is the short-circuit withstand capacity?

A: It has 17kA rated short-circuit making capacity and 10kA/30ms short-time withstand capacity, which meets the requirements of most industrial low-voltage distribution systems.

Package Content

1 × LMS2-125GA PC Class Automatic Transfer Switch 1 × Product Manual