ABB SACE PR212/P Electronic Trip Unit
The ABB SACE PR212/P is a microprocessor-based electronic trip unit designed for use with SACE molded case circuit breakers. This protection device provides comprehensive overcurrent protection with adjustable LSI functions, enabling precise coordination with downstream equipment. The unit integrates seamlessly into compatible SACE breaker frames, delivering reliable protection for low-voltage electrical distribution systems.
Protection Functions and Adjustability
The PR212/P implements LSI protection curves comprising overload protection with inverse time delay, short-time protection with adjustable delay, and instantaneous protection. The overload threshold is adjustable across a range based on the breaker frame rating, allowing fine-tuning to match specific load characteristics. Short-time protection includes selectable I²t on or off functions, while instantaneous protection provides fast response for high-magnitude fault currents. These adjustable parameters enable selective coordination with upstream and downstream devices.
Measurement and Monitoring Capabilities
Integrated current sensing provides accurate measurement of phase currents, enabling real-time monitoring of load conditions. The trip unit displays operational data including current values and protection status through front-panel indicators. Internal diagnostics continuously assess system integrity, generating alarm signals when approaching trip thresholds. This visibility allows operators to anticipate overload conditions and perform preventive maintenance before unplanned outages occur.
Communication and Integration
The PR212/P supports optional communication modules that enable integration into supervisory control and data acquisition systems. When equipped with communication interfaces, the trip unit provides remote access to protection settings, measured values, and event logs. This connectivity facilitates centralized monitoring and coordinated protection management across electrical distribution networks, reducing the need for local intervention during routine operations.
Installation and Compatibility
Designed for direct mounting within SACE circuit breaker enclosures, the PR212/P interfaces with the breaker’s current sensors and operating mechanism. Installation involves plug-in connection to the breaker frame, eliminating the need for external wiring of protection functions. The unit is compatible with specific SACE breaker series, maintaining the mechanical and electrical integrity of the original equipment configuration.
Reliability and Application Suitability
The PR212/P is constructed for continuous operation in electrical distribution environments, with robust electronics housed within the breaker enclosure. Its solid-state design eliminates moving parts in the protection chain, enhancing reliability over mechanical trip systems. Typical applications include main distribution boards, feeder circuits, and motor control centers where adjustable protection and coordination capabilities are required.
