Delixi CDM3-63 C16 1P CDM3 series Moulded Case Circuit Breaker

The Delixi CDM3-63 C16 1P is a classic, 16-ampere, C-curve, single-pole miniature circuit breaker. It's a cost-effective solution for providing basic overload and short-circuit protection for common socket outlets and lighting circuits within limited space and budget. While not as safe as 1P+N or 2P circuit breakers, its extreme compactness and low cost make it widely used in a wide range of projects.

Key Recommendation: For new installations or retrofits, if budget permits, choosing the CDM3-63 C16 1P+N or the CDM3LE series with residual current protection for socket outlet circuits is a safer and more modern option.

I. Overall Product Positioning

This is a single-pole miniature circuit breaker from Delixi's classic CDM3 series. It does not feature residual current protection, but its core function is clear: protecting the live (phase) wire of a circuit from overload and short-circuit. Its 16A rated current makes it an ideal choice for protecting common socket outlets and lighting circuits.

II. Model Details

Each part of the model number CDM3-63 C16 1P indicates its key features:

1. Series: CDM3

This indicates it belongs to Delixi's CDM3 series. This series is a pillar of Delixi's product line, renowned for its exceptionally high cost-effectiveness, stable performance, and widespread market acceptance, making it the preferred entry-level choice for residential and commercial power distribution.

2. Frame Rating: -63

This indicates that the maximum current rating of the "frame" or "frame" to which this circuit breaker belongs is 63A. This C16 circuit breaker is manufactured within this 63A frame.

3. Tripping Curve and Rated Current: C16

C: This is the tripping characteristic curve. The C curve is the most common and versatile type, with an instantaneous tripping current range of 5 to 10 times the rated current (i.e., 16A * 5 - 10 = 80A - 160A). It can withstand the starting surge current of common household appliances (such as refrigerators, TVs, and computers) while also responding quickly to short circuits. It is a standard feature in home and office circuits.

16: This is the rated operating current. This circuit breaker is designed to safely carry a current of 16A for extended periods. When the current in the circuit exceeds 16A continuously, it activates overload protection and trips after a delay.

4. Number of Poles: 1P

1P stands for single-pole. It has only one protective pole, controlling and protecting the live wire (L).

When it is disconnected (manually closed or tripped by a fault), only the live wire is disconnected, while the neutral wire (N) remains connected.

Its physical width is very compact, measuring a standard 1-module (18mm), allowing for dense mounting on the distribution box's DIN rails.

III. Core Protection Functions

Overload Protection: When the current exceeds 16A for a prolonged period (for example, reaching 20-25A for a sustained period), the bimetallic strip inside the circuit breaker will bend due to overheating, eventually triggering the trip mechanism, thereby protecting the wire insulation from overheating and fire.

Short-Circuit Protection: When a short circuit occurs (e.g., when the live and neutral wires come into direct contact), generating an abnormally high current (typically exceeding hundreds of amperes), the electromagnetic trip device inside the circuit breaker will instantly (within milliseconds) trip, forcibly disconnecting the circuit and preventing catastrophic accidents.

IV. Typical Application Scenarios

This CDM3-63 C16 1P circuit breaker is a "standard unit" in power distribution systems and is typically used for:

General Outlet Circuit: Protects power outlets in areas such as living rooms, bedrooms, and study rooms.

Lighting Circuit: Protects lighting circuits throughout the house. For homes equipped with only LED lights, a 16A capacity is more than sufficient.

Dedicated Circuit for Low-Power Appliances: For example, dedicated outlets for televisions, computers, stereos, and other devices.

5. Selection and Installation Considerations

Circuit Compatibility: This circuit breaker is designed to protect 2.5mm² copper conductors. This is the standard configuration for Chinese household socket circuits. Ensure that the circuit specifications match this.

Power Calculation: At 220V, a C16 circuit breaker supports a maximum load of approximately 16A * 220V = 3520W. This can simultaneously meet the power needs of multiple small and medium-power appliances.

Safety Limitations: Because 1P circuit breakers only disconnect the live wire, when repairing or replacing outlets, even when the circuit breaker is off, the neutral busbar remains energized, posing a safety risk. Therefore, the upper-level main switch must be turned off during this operation to ensure complete power outage.

Difference from 1P+N: 1P+N circuit breakers simultaneously disconnect both the live and neutral wires when tripped or shut down, providing greater electrical isolation and safety while maintaining the same footprint (also 18mm). Therefore, 1P+N circuit breakers are becoming a more suitable alternative to 1P in modern home renovations.

No leakage protection: This model does not have leakage protection. If you need to prevent electric shock, you must equip the socket circuit with a leakage protector in the distribution box.