Why Choose the ABB 2CDS383103R0518 S303P-Z25NA Miniature Circuit Breaker?
The ABB 2CDS383103R0518, also identified as the S303P-Z25NA, is a high-performance miniature circuit breaker (MCB) designed to protect sensitive industrial electrical circuits against overloads and short circuits. As part of the advanced ABB System pro M compact S300P series, it provides reliable circuit protection, a high breaking capacity and compatibility with international IEC, UL and CSA requirements.
This circuit breaker features a sensitive Type Z tripping characteristic, making it particularly suitable for electronic equipment, semiconductor devices, control circuits and other loads that require rapid protection against relatively low short-circuit currents. Its thermal release provides dependable overload protection, while the electromagnetic release quickly disconnects the circuit during a fault.
With a rated current of 25 A, a 3P+N configuration and a rated operational voltage of up to 415 V AC, the S303P-Z25NA is suitable for three-phase industrial distribution and automation systems. Its 25 kA breaking capacity, compact DIN-rail format and integrated trip indication support safe and efficient installation in control panels, switchboards and specialist electrical equipment.
Key Advantages
- High-performance miniature circuit breaker for sensitive industrial circuits.
- 25 A rated current suitable for three-phase electrical loads.
- 3P+N pole configuration for coordinated phase and neutral switching.
- Type Z tripping characteristic provides fast protection for sensitive equipment.
- 25 kA short-circuit breaking capacity for demanding installations.
- Integrated trip-position indicator helps identify fault-related operation.
- Fail-safe terminals reduce the risk of incorrect conductor insertion.
- Compatible with ABB System pro M compact accessories.
Key Features
- ABB System pro M compact S300P series.
- S303P-Z25NA extended product type.
- 25 A rated current.
- 415 V AC rated operational voltage.
- 3P+N pole arrangement.
- Type Z tripping characteristic for sensitive electrical and electronic loads.
- 25 kA rated ultimate short-circuit breaking capacity.
- Integrated contact-position and trip-position indication.
- Bi-directional terminals support supply connections from the top or bottom.
- Dual DIN-rail release system enables efficient installation and removal.
Reliable Protection for Sensitive Electrical Equipment
Miniature circuit breakers such as the ABB S303P-Z25NA automatically disconnect an electrical circuit when excessive current is caused by an overload or short circuit. This helps protect cables, control equipment and connected devices while reducing the risk of electrical damage, unplanned downtime and unsafe operating conditions.
The Type Z characteristic provides a sensitive magnetic response and is commonly selected for circuits containing electronic components, semiconductor devices and other equipment with limited tolerance to overcurrent. Its fast operation helps minimise fault energy before sensitive components can be damaged.
Typical Applications
- Industrial control and automation circuits.
- Electronic equipment and semiconductor devices.
- PLC, instrumentation and measurement systems.
- Three-phase control panels and switchboards.
- Data centres and communications equipment.
- Commercial building management systems.
- Specialist machinery with sensitive electrical components.
