Description

ABB S503X: High-Performance Miniature Circuit Breaker for Precision Power Protection

Product Overview

The ABB S503X is a compact, high-reliability miniature circuit breaker (MCB) designed for critical power distribution applications in industrial, commercial, and residential environments. As part of ABB’s S500 series, this breaker delivers precise overload and short-circuit protection, ensuring safe and efficient operation in low-voltage systems up to 440V AC. With a 32A rated current and 50kA short-circuit breaking capacity (Icu), the ABB S503X excels in demanding settings such as data centers, manufacturing plants, and commercial buildings where space efficiency and high performance are essential 19.

Featuring a modular design and DIN rail mounting compatibility, the ABB S503X simplifies installation and expansion in compact control panels. Its B/C/D trip characteristics allow customization for different load types, from resistive loads (B) to inductive and motor loads (C/D), ensuring optimal protection for diverse applications. The breaker’s thermal-magnetic trip unit provides rapid fault detection (<10ms response time), minimizing downtime and equipment damage.

Compliant with IEC 60947-2 and UL 489 standards, the ABB S503X meets global safety requirements and integrates seamlessly with ABB’s i-bus® building automation systems for advanced monitoring and control. Its IP20-rated enclosure safeguards against dust and accidental contact, while the clear status indicators (ON/OFF/TRIP) enable quick visual diagnostics.

Technical Specifications

Parameter	Value
Product Model	ABB S503X
Manufacturer	ABB
Product Type	Miniature Circuit Breaker (MCB)
Rated Current	32A
Rated Voltage	440V AC
Short-Circuit Breaking Capacity (Icu)	50kA
Trip Characteristics	B/C/D (selectable)
Number of Poles	3P
Mounting	DIN rail (EN 50022)
Physical Dimensions	70 x 17.5 x 70 mm
Weight	~0.08 kg
Operating Temperature	-5°C to +60°C
Certifications	IEC 60947-2, UL 489, CE
Enclosure Rating	IP20
Response Time	<10 ms

Key Features and Advantages

Precision Protection: The ABB S503X offers selectable B/C/D trip curves, adapting to resistive, inductive, or motor loads. Its thermal-magnetic trip unit combines overload protection (via a bimetallic strip) with instantaneous short-circuit protection (via a magnetic coil), ensuring reliable fault interruption 16.

Compact Design: With dimensions of 70 x 17.5 x 70 mm and a weight of 0.08 kg, the breaker optimizes space in crowded control panels. Its modular construction allows easy integration with accessories like auxiliary contacts and shunt trip coils, enhancing system flexibility 19.

High Reliability: Built with industrial-grade materials, the ABB S503X withstands voltage fluctuations (440V AC ±10%) and extreme temperatures (-5°C to +60°C). Its 50kA breaking capacity ensures safe operation in high-demand environments, while the IP20-rated enclosure prevents dust ingress and accidental contact.

Global Compliance: Certified to IEC 60947-2 and UL 489, the breaker meets international safety standards, making it suitable for global applications. Its compatibility with ABB’s i-bus® systems enables remote monitoring and predictive maintenance, reducing lifecycle costs.

Easy Maintenance: The ABB S503X features clear status indicators for quick fault identification and a DIN rail mounting system that facilitates tool-free replacement. Regular inspections and firmware updates (via ABB’s Relion® software) ensure long-term performance.

Applications

The ABB S503X is ideal for industries requiring precise power protection and space-efficient design:

Data Centers: Safeguarding critical IT infrastructure, including servers, cooling systems, and UPS units, from overloads and short circuits.
Manufacturing: Protecting motors, conveyor belts, and automated machinery in automotive plants, food processing facilities, and chemical industries.
Commercial Buildings: Providing reliable circuit protection for lighting systems, HVAC units, and elevators in office towers and shopping complexes.
Residential: Ensuring safety in high-rise apartments and luxury homes, particularly for high-power appliances like air conditioners and electric heaters.
Renewable Energy: Managing power distribution in solar and wind farms, where voltage fluctuations and harsh environmental conditions are common 16.

By integrating with ABB’s Emax 2 circuit breakers and i-bus® control systems, the ABB S503X enables centralized energy management and real-time diagnostics, optimizing operational efficiency.

Installation and Maintenance

Installation Preparation:

Verify the power supply matches the ABB S503X’s 440V AC requirements and ensure proper grounding to prevent electrical interference.
Mount the breaker on a DIN rail within the switchboard, following IEC standards for mechanical stability.
Connect cables to the M4 screw terminals, tightening to 2.5 N·m torque to ensure secure connections.

Maintenance Recommendations:

Regularly inspect status indicators to identify fault conditions. Replace faulty breakers immediately to maintain system integrity.
Clean the breaker’s surface periodically to remove dust and debris, ensuring optimal thermal performance in high-temperature environments.
Perform annual calibration checks using ABB’s Trip Unit Testing Kit to verify trip curve accuracy and reset mechanisms.

Product Assurance

ABB guarantees the ABB S503X with a 1-year warranty covering defects in materials and workmanship. Our global support network provides 24/7 technical assistance, including remote diagnostics and on-site service. All breakers undergo rigorous testing to meet ISO 9001 standards, ensuring consistent performance across diverse industrial applications. For mission-critical projects, ABB offers extended warranties and lifecycle management services to maximize system longevity and reliability.

HS:8517699000

Contact info

WhatsApp: +86 18030182217
Email: sandydcsplc@gmail.com
Phone: +86 18030182217
Wechat: +86 18030182217
Website: www.xiongbaparts.com

ABB S503X Miniature Circuit Breake(XIONGBA)