Delixi CDM3-63 D25 3P CDM3 series Moulded Case Circuit Breaker

This is a Three-Pole, Standard Moulded Case Circuit Breaker (MCCB) from Delixi's CDM3 series. It is designed to protect a three-phase electrical circuit from overloads and short-circuits.

Model Number Breakdown (CDM3-63 D25 3P)

1. Series: CDM3

Indicates the product belongs to Delixi's CDM3 series, a widely used and cost-effective line of circuit breakers known for reliability in residential, commercial, and light industrial applications.

2. Frame Rating: -63

This denotes the "Frame Size". The breaker is part of a family where the housing and mechanism are designed for a maximum current rating of 63 Amps. This is the highest current any breaker in this specific frame can be rated for.

3. Tripping Characteristic & Current Rating: D25

D: This is the tripping characteristic curve. A "D-curve" is specifically designed for circuits with very high inrush currents. It has a higher magnetic trip threshold (typically between 10 and 20 times the rated current) than the common C-curve. This prevents nuisance tripping when motors or transformers start up.

25: This is the rated operational current. The breaker is designed to carry 25 Amps per phase continuously and will trip on a sustained overload above this value.

4. Number of Poles: 3P

3P means "Three-Pole". It has three switching and protection poles, meaning it can simultaneously connect and disconnect all three live (phase) wires (L1, L2, L3) of a three-phase power supply.

It does not switch the neutral wire. The neutral remains common in the system.

Key Features and Protections

Overload Protection: If the current on any phase exceeds 25A for a prolonged period, a thermal mechanism (bimetallic strip) will heat up and trip the breaker, protecting the wiring and equipment from damage.

Short-Circuit Protection: In the event of a severe short-circuit between phases or to ground, an electromagnetic solenoid inside instantly trips the breaker to cut off the power and prevent damage to the entire electrical system.

High Inrush Current Tolerance: The D-curve is the key feature here. It allows for a brief current surge of 10-20x the rated current (i.e., 250A to 500A) without tripping, which is essential for motor starting.

Typical Applications

This specific model (CDM3-63 D25 3P) is ideally suited for controlling and protecting three-phase equipment, such as:

Industrial Motors: For machine tools, conveyor belts, pumps, and compressors.

Three-Phase Heaters: In industrial ovens or heating systems.

Motor Control Centers (MCCs): As a branch circuit disconnect and protection device.

Commercial HVAC Systems: Protecting three-phase air conditioning compressors.

Workshop Equipment: Such as large lathes, saws, or other three-phase machinery.