Mechanical Interlock LMI-12

LMI-12-Accessories (Final Power Distribution)-Front

LMI-12-Accessories (Final Power Distribution)-Side

LMI-12-Accessories (Final Power Distribution)

LMI-12-Accessories (Final Power Distribution)-Front

LMI-12-Accessories (Final Power Distribution)-Side

LMI-12-Accessories (Final Power Distribution)

Mechanical Interlock LMI-12

The CHINT LMI-12 Mechanical Interlock is designed to ensure the safe and reliable manual switching of dual power supplies. It prevents two main circuits from being operated simultaneously, reducing the risk of electrical faults. Suitable for residential, commercial, and industrial environments such as hotels, shopping malls, and offices, the LMI-12 offers a compact 9 mm design, wide –35°C to +70°C temperature range, and easy DIN-rail installation for dependable operation in low-voltage distribution systems.

Product Information

Function: Manual switching of dual power supply; prevents simultaneous operation of main circuits.
Applications: Homes, business clubs, hotels, shopping malls, and other commercial installations.
Ambient Temperature Range: –35°C to +70°C
Altitude: ≤ 3000 m
Humidity Conditions: ≤ 50% RH at +40°C; ≤ 90% RH at +20°C
Pollution Degree: Grade 2
Installation Category: Class II and III
Pole Number: 1P
Product Width: 9 mm
Mechanical Interlock Type: Manual switching between dual power supplies
Assembly Method: Between two or more stage circuit breakers (2P NXB-125/DZ158 series).
Mounting Type: Standard DIN-rail installation
Dimensions (mm):
- Height: 70.8
- Width: 9
- Depth: 45
Mounting width: 22.5 mm (as shown in dimensional drawing, P-142)
Housing Material: Flame-retardant engineering plastic

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LMI-12-ACCESSORIES-(FINAL-POWER-DISTRIBUTION)-Catalog.pdf

190.67KB

2025-12-09

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2209-LMI-12-Accessories (Final Power Distribution)-Manual.pdf

2.36MB

2024-09-22

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FAQs

What is the main function of the LMI-12 Mechanical Interlock?

It ensures that two power circuits cannot be operated simultaneously, allowing safe manual switching between main and backup power sources.

Where can the LMI-12 be used?

The interlock is ideal for residential, commercial, and light industrial applications where dual power systems are employed, such as hotels, offices, and retail centers.

How is the LMI-12 installed?

It is mounted between two-stage or multi-stage circuit breakers using a DIN rail.

What are its environmental operation limits?

The LMI-12 performs reliably in temperatures from –35°C to +70°C, at altitudes up to 3000 m, and under relative humidity up to 90% at +20°C.

Why choose the LMI-12?

It offers compact construction, wide environmental tolerance, and compatibility with NXB-125 series breakers, providing safe, cost-effective mechanical isolation between dual power sources