LRM2-63 1P Miniature Circuit Breaker

Main Features & Advantages

1.Main Features

1.1Compact size, low cost, convenient installation, saving space in distribution boxes.

1.2.Provides overload and short-circuit protection for the live wire only, without earth leakage protection (except for earth leakage type).

1.3. Complies with standards IEC 60898, with a usual breaking capacity of 6000A 1.4.Advantages: Small size, low cost, fast installation, suitable for lighting circuits.

2. Basic Functions

2.1 Overload Protection (Thermal Protection)

Principle: The internal bimetallic strip bends when heated, pushing the tripping mechanism to disconnect with time delay.

Function: Prevents overheating of wires, insulation aging and equipment burnout in case of long-term overcurrent (e.g. 1.13~1.45 times rated current) of circuits/equipment.

2.2 Short-circuit Protection (Electromagnetic Protection)

Principle: High current generated during short circuit makes the electromagnetic coil attract the release instantly, disconnecting instantaneously (usually <0.1 second).

Function: Cuts off the power quickly in case of short-circuit faults to avoid electric arcs, fires and equipment explosions.

2.3 Manual Switching On/Off

Function: Serves as a disconnector for manual connection or disconnection of the live wire, used for maintenance and power-off operations.

2.4 Auxiliary Functions (Optional)

Can be equipped with auxiliary contacts, alarm contacts, shunt trips, etc., to realize remote control and status indication.

1P+N type: Synchronously disconnects the neutral wire, but the neutral wire has no protection function, with higher safety.

Full Technical Specifications

Product Uses

1.Pure lighting circuits in residential/commercial buildings (living room, bedroom, corridor lights).

2.Low-power resistive loads (LED lights, small fans, ordinary socket branches).

3. Old house renovation and engineering batch lighting, pursuing cost performance and space utilization.

Product Operate Guide

How to Use 1P Miniature Circuit Breaker

1. Scope of Application

1P Miniature Circuit Breaker (1P MCB) is only suitable for single-phase 220V power distribution systems, mainly used for:

Lighting circuits

Low-power general socket circuits

Not recommended for high-power electrical appliances, kitchens, bathrooms or humid locations

2. Pre-installation Preparation

Confirm parameter matching

Rated voltage: AC 230V

Rated current: Select according to the load (e.g., 6A, 10A, 16A, 20A, etc.)

Breaking capacity: 6kA/10kA

Power-off operation

Installation, wiring and replacement must be carried out under complete power-off condition. Live working is strictly prohibited.

Installation method

Standard 35mm rail mounting: clip the MCB onto the distribution box rail.

3. Correct Wiring Method (Key Point)

1P circuit breaker controls the live wire (L) only. Wiring rules:

Upper terminal: Incoming live wire L

Lower terminal: Outgoing live wire L

Neutral wire N: Do not pass through the circuit breaker, connect directly to the neutral busbar in the distribution box

Protective earth PE: Never connect to the circuit breaker; must be connected to the earth busbar separately

⚠️ It is strictly prohibited to connect the neutral wire to a 1P circuit breaker, as it may cause serious potential safety hazards.

4. Switching On and Off Operations

Switching On

Push the operating handle upward to the "ON" position

The circuit is energized and operates normally

Switching Off

Pull the handle downward to the "OFF" position

Used for maintenance, power cut, lamp replacement, etc.

Reset after tripping

After tripping due to circuit fault, the handle will stay in the middle position:

Pull it downward to OFF first

Push upward to ON to complete reset

5. Usage Precautions

Do not use the MCB beyond its rated current, otherwise frequent tripping or burnout may occur.

For humid locations (bathrooms, kitchens) and high-power appliances, 1P+N or 2P circuit breakers are recommended.

The neutral wire remains live after a 1P circuit breaker trips. Always switch off the main upstream breaker before maintenance.

Not suitable for protecting motors and other power loads (special MCBs for motor protection should be selected).

Regular inspection: check for abnormal noise, heating, burning smell or loose connections; replace immediately if any abnormality is found.

Frequently Asked Questions (FAQs)

1. Frequent tripping during normal use

Cause: Overload, live wire short circuit, poor terminal contact, aging

Solution: Reduce load/replace with suitable model, check short circuit, tighten terminals, replace aging parts

2. Trips immediately after closing

Cause: Short circuit in downstream live wire, socket or electrical appliance

Solution: Turn off load and close, check lines/inspect appliances one by one

3. Cannot close, handle stuck

Cause: Trip not reset, live wire fault not eliminated, internal damage

Solution: Switch to OFF to reset, eliminate fault, replace if damaged

4. Terminal overheating, burning smell

Cause: Loose live wire connection, small wire diameter, poor contact

Solution: Power off and tighten, replace with suitable wire diameter, clean and reconnect

5. No tripping on short circuit/overload

Cause: Trip damage, mismatched model, aging

Solution: Replace immediately, select suitable model, replace regularly

6. Abnormal noise/vibration during operation

Cause: Loose installation, slight live wire overload, internal looseness

Solution: Tighten installation, check load/terminals, replace if noisy