LRM2-63 2P Miniature Circuit Breaker (2-pole MCB)

Main Features & Advantages

Basic Functions

1.Short-circuit Protection

When a short circuit occurs in the circuit, the internal electromagnetic release acts instantaneously to cut off both the live wire and neutral wire within a very short time, preventing electric arcs, fire hazards and equipment damage.

2 Overload Protection

When the circuit operates under long-term overload, the internal bimetallic strip deforms under heat to trigger delayed tripping and cut off the power supply, so as to avoid wire overheating, insulation aging and related safety accidents.

3 Manual Switching On/Off Control

It can be used as a manual disconnector. Pushing the handle upward switches on the power, while pulling it downward switches off the power, facilitating safe power interruption during circuit maintenance and equipment replacement.

4 Simultaneous Switching of Two Poles

Both the live wire and neutral wire are disconnected at the same time during tripping, making the circuit completely dead, which greatly reduces the risk of electric shock during maintenance. This is the core safety advantage of 2P MCB.

5 Optional Auxiliary Functions

Some models can be equipped with leakage protection modules, auxiliary contacts, alarm contacts or shunt trips to realize earth leakage protection, remote control and fault signal feedback.

Full Technical Specifications

Product Uses

Typical Applications

1 Main incoming switch for residential buildings

2 High-power or humid circuits such as air conditioners, water heaters, kitchens and bathrooms

3 Main socket circuits and dedicated circuits for important electrical equipment

4 Branches in commercial and industrial places with high power safety requirements

Product Operate Guide

How to Use 2P Miniature Circuit Breaker

1. Scope of Application

2P MCB is suitable for single-phase 220V/230V and three-phase 380V/400V AC power systems, mainly used for:

- Household main incoming power switch

- High-power load circuits: air conditioners, water heaters, kitchen and bathroom sockets

- Circuits with high safety requirements

- General power and socket circuits in commercial and industrial places

2. Pre-installation Notes

- Installation must be performed under complete power-off condition. Live working is strictly prohibited.

- Confirm rated current, voltage and breaking capacity match the circuit requirements.

- Standard mounting on 35mm DIN rail in distribution box.

3. Wiring Method

2P circuit breaker controls both live wire (L) and neutral wire (N).

- Upper terminals: connect incoming L and incoming N

- Lower terminals: connect outgoing L and outgoing N

- Protective earth wire (PE) must be connected to the earth busbar separately, never connected to the breaker

4. Operation Instructions

Switching On

Push the operating handle upward to the ON position; both poles are switched on.

Switching Off

Pull the handle downward to the OFF position; both poles are disconnected.

Reset After Tripping

When the breaker trips due to fault, the handle stays in the OFF position:

1. Pull the handle fully down to OFF again

2. Push upward to ON to reset

5. Safety Precautions

- Do not use over rated current, which may cause frequent tripping or overheating.

- After tripping, check and eliminate circuit faults (short circuit, overload) before resetting.

- 2P MCB disconnects both L and N, making the circuit completely dead, which is safer for maintenance.

- Regularly check for abnormal heating, loosening or damage; replace the breaker if any fault occurs.

6. Troubleshooting

- Trips immediately after closing: short circuit in the circuit, check wiring and loads.

- Trips after working for a period: circuit overload, reduce load or use a higher rated breaker.

- Cannot be closed: internal mechanism fault, replace with a new unit.

Frequently Asked Questions (FAQs)

1. Frequent tripping during normal use

Cause: Overload, line/load short circuit, poor terminal contact, breaker aging

Solution: Reduce load/replace with higher rated current model, check for short circuit, tighten terminals, replace aging breaker

2. Trips immediately after closing

Cause: Short circuit in downstream lines, sockets or electrical appliances

Solution: Turn off all loads and close, check lines/inspect each appliance one by one

3. Cannot close, handle stuck

Cause: Tripping mechanism not reset, fault not eliminated, internal structure damage

Solution: First switch to OFF to reset, eliminate faults, replace if damaged

4. Terminal overheating, discoloration or burning smell

Cause: Loose wiring, too small wire diameter, poor contact

Solution: Power off and tighten screws, replace with appropriate wire diameter, clean terminals and reconnect

5. No tripping in case of short circuit/overload

Cause: Tripping mechanism damage, wrong model selection, breaker aging

Solution: Stop using and replace immediately, select appropriate model, replace aging parts regularly

6. Abnormal noise/vibration during operation

Cause: Loose DIN rail installation, slight overload, internal looseness

Solution: Fasten installation, check load/terminals, replace if abnormal noise persists

7. Trips when a specific appliance is turned on

Cause: Short circuit, leakage or internal fault of the appliance

Solution: Stop using the faulty appliance, repair or replace it