ABB SACE PR112/P Protection Unit: Advanced Electronic Release for Emax 2 Air Circuit Breakers

The ABB SACE PR112/P is a highly configurable, fixed-threshold electronic protection unit (trip unit) designed for integration with ABB’s Emax 2 series air circuit breakers (ACBs). It serves as the intelligent “brain” of the breaker, providing precise protection against overloads, short-circuits, and ground faults, while also offering extensive measurement, communication, and control capabilities for advanced low-voltage distribution system management.

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Description

Application Scenarios:In a large data center’s main electrical room, achieving perfect selectivity between the main incoming breaker and downstream feeder breakers was paramount to prevent a total site blackout from a single feeder fault. The standard thermal-magnetic releases on older breakers could not guarantee this. Upgrading the main 4000A Emax 2 breaker with the ABB SACE PR112/P unit allowed engineers to program precisely coordinated L, S, I, and G protection curves. During a simulated fault test, a downstream feeder fault was cleared instantly by its own breaker, while the main PR112/P-equipped breaker selectively held, keeping the entire data center online. This demonstrated the unit’s critical role in maximizing uptime through engineered selectivity.

Parameter:

Main Parameters	Value/Description
Product Model	ABB SACE PR112/P
Manufacturer	ABB (SACE Division – Low Voltage Products)
Product Category	Electronic Protection Unit / Trip Unit
Compatible Breaker	ABB Emax 2 Air Circuit Breakers (ACBs)
Rated Current (In)	Defines the unit’s rating plug value (e.g., for breakers from 800A to 6300A).
Protection Functions	L (Overload), S (Short-time), I (Instantaneous), G (Ground-fault)
Setting Type	Fixed-threshold (adjustable within defined bands, e.g., Ir = 0.4-1 x In).
Communication Interface	Integrated communication port (supports add-on communication modules).
Measurement Data	Displays V, I, P, Q, S, PF, Freq., Energy, THD, Alarms, and Events.
Display	Graphical LCD with intuitive menu navigation.
Protection Curves	Programmable with adjustable delays (e.g., ti, ts) for time-current coordination.
Standards	IEC 60947-2, IEC 60255, UL 489.