ABB SZ203-B16 Miniature Circuit Breaker, 3-Pole, 16A, 6kA

The ABB SZ203-B16 is a high-performance 3-pole miniature circuit breaker engineered to provide robust protection for electrical circuits. Designed for both residential and commercial applications, this device effectively detects and interrupts overcurrents, safeguarding your electrical infrastructure from the risks of overloads and short circuits. Its reliable construction ensures consistent performance and operational safety in diverse electrical distribution systems.

Advantages

This miniature circuit breaker offers exceptional reliability and durability, meeting stringent industry standards for electrical safety. Its 3-pole configuration allows for the simultaneous disconnection of three phases, providing comprehensive protection for three-phase electrical systems. The compact design facilitates easy installation in standard distribution boards, while the high-quality internal components ensure long-term operational stability and precise tripping characteristics under fault conditions.

Suitable for

• Residential electrical distribution boards
• Commercial building electrical systems
• Protection of three-phase circuits
• Small industrial machinery and equipment
• Lighting and power outlet circuits

When it may not be suitable

This device is not intended for use in high-voltage industrial power distribution networks that exceed its rated breaking capacity. It is also not suitable for environments requiring specialized protection features such as residual current detection or specific DC-only applications unless otherwise specified by the manufacturer.

Key specifications

• Rated current: 16A
• Number of poles: 3
• Breaking capacity: 6kA
• Tripping characteristic: B
• Mounting type: DIN rail

How to use

The ABB SZ203-B16 should be installed by a qualified electrician in accordance with local electrical regulations. The device is designed for mounting onto a standard 35mm DIN rail within an electrical enclosure. Ensure that the supply cables are securely connected to the input terminals and the load cables to the output terminals, maintaining proper torque settings as specified. Once installed, the toggle switch can be used to manually energize or de-energize the circuit.

What to consider before purchase

• Verify that the 16A rated current matches your circuit load requirements.
• Ensure the 6kA breaking capacity is sufficient for the prospective short-circuit current at the installation point.
• Confirm that the B-type tripping characteristic is appropriate for your specific load type.
• Check the available space in your distribution board for a 3-pole device.

Usage recommendations

Regularly inspect the circuit breaker for any signs of physical damage or overheating. It is recommended to perform periodic functional checks to ensure the device remains in optimal working condition. Always disconnect the power supply before performing any maintenance or modifications to the electrical circuit.