2CCS864002R0407 ABB S804S-K8-R 4-Pole 8 A Type K 50 kA Miniature Circuit Breaker

Why Choose the ABB S804S-K8-R High-Performance Miniature Circuit Breaker?

The ABB S804S-K8-R is a high-performance 4-pole miniature circuit breaker (MCB) designed to provide dependable overload and short-circuit protection in demanding electrical installations. Part of the ABB S800S high-performance circuit breaker series, it combines an 8 A rated current, K tripping characteristic and high short-circuit breaking capability for industrial distribution and equipment circuits.

The S804S-K8-R provides thermal protection against sustained overloads together with rapid electromagnetic protection against short-circuit faults. Its current-limiting construction helps reduce the energy passed through during severe faults, limiting thermal and electrodynamic stresses on conductors, connected equipment and downstream electrical components.

With its 4-pole configuration, 8 A current rating and 50 kA short-circuit breaking capacity, the S804S-K8-R is suited to demanding circuits with high prospective fault currents. Its K characteristic is particularly useful for inductive loads such as motors and transformers where elevated starting currents can occur, while the R version provides ring-terminal connections.

Key Advantages

• High-performance 4-pole miniature circuit breaker for demanding installations.
• 8 A rated current with K tripping characteristic.
• High 50 kA short-circuit breaking capacity.
• Ring-terminal connection version for secure conductor termination.
• K characteristic suited to inductive equipment with elevated starting currents.
• Thermal overload and electromagnetic short-circuit protection.
• Current-limiting operation helps reduce fault energy and stress on downstream equipment.

Key Features

• ABB S800S high-performance circuit breaker series.
• 4-pole configuration.
• 8 A rated current.
• Type K tripping characteristic.
• 50 kA short-circuit breaking capacity.
• Ring-terminal connection.
• Thermal release for overload protection.
• Electromagnetic release for rapid short-circuit protection.
• Current-limiting design for effective fault interruption.
• Well suited to motor, transformer and other inductive-load circuits.

Reliable Protection for Inductive and High-Inrush Loads

The ABB S804S-K8-R combines thermal overload protection with rapid electromagnetic short-circuit interruption. Sustained overcurrents activate the thermal protection mechanism, while severe short-circuit currents are interrupted rapidly by the electromagnetic release, providing coordinated protection for conductors and connected equipment.

The K tripping characteristic is designed for applications where inductive equipment can produce elevated starting currents during normal operation. This makes the S804S-K8-R particularly suitable for motors, transformers and similar loads, providing tolerance of legitimate start-up current while maintaining dependable protection against genuine electrical faults.

Typical Applications

• Industrial motor circuits.
• Transformer and inductive-load protection.
• Industrial machinery and automation systems.
• Electrical distribution and control panels.
• Four-pole equipment circuits.
• Loads with elevated normal starting currents.
• Installations with high prospective short-circuit currents.