ABB SACE Megamax F2 3 PR111/B N F air circuit breaker Low Voltage

Here is a detailed breakdown of the ABB SACE Megamax F2 3 PR111/B N F low voltage air circuit breaker.

This is a specific model number for a legacy, high-performance circuit breaker. Let's decode each part of the designation.

Model Number Decoding

Code Segment

Meaning

Description

SACE

ABB Breaker Brand

The brand name for ABB's line of low-voltage circuit breakers.

Megamax F

Product Series

A flagship line of fixed-mount air circuit breakers, now discontinued.

F2

Frame Size

This indicates a 1250 Amp frame. This is the physical size and the maximum current the breaker mechanism is designed for.

3

Poles

This is a 3-pole breaker (for connecting to a 3-phase system).

PR111/B

Tripping Unit

A standard electronic overcurrent release. The /B suffix typically indicates a Basic version of the PR111 unit with Long-time (L), Short-time (S), and Instantaneous (I) protection functions.

N

Breaking Capacity

"N" stands for "Normal" breaking capacity. For the Megamax F series, this is a very high value (e.g., ~70-85 kA at 415V).

F

Mounting Style

Fixed mounting. The breaker is bolted directly to the busbars and cannot be withdrawn.

Summary of Specifications

• Type: Fixed Mount Air Circuit Breaker (ACB)

• Rated Current (Iu): Up to 1250 A (The actual set value is adjusted on the PR111/B trip unit)

• Poles: 3

• Breaking Capacity (Icu): Normal (N) - Very High

• Trip Unit: PR111/B - Basic electronic trip unit providing fundamental protection.

• Protection Functions: Overload (L), Selective Short-Circuit (S), Instantaneous Short-Circuit (I).

• Operation: Fixed installation with manual operation (implied by the lack of a specialized operator code).

Critical Information: Status and Replacement

1. This Product is OBSOLETE.

The ABB SACE Megamax F series has been out of production for many years. It was succeeded by the SACE Emax and later the SACE Emax 2 series.

2. Direct Modern Replacement:

The official and direct replacement for this breaker is the ABB SACE Emax 2 series.

An equivalent modern model would be similar to:

SACE E2.1 N 1250 Ekip G LSI

• E2.1: Emax 2, frame size for 1250A.

• N: Comparable high breaking capacity.

• Ekip G LSI: The modern digital trip unit that replaces the old PR111. It offers more precise settings, a digital display, and communication capabilities.

3. What This Means For You:

• If in service: This breaker is old. It is crucial to have it inspected and maintained by a qualified technician. Aging components, especially in the electronic trip unit, can lead to failure.

• If you need a spare or replacement: Do not search for this exact obsolete model. The correct path is to retrofit with an Emax 2.

• Retrofit Advantage: The Emax 2 is designed to be a direct, form-fit-function replacement in many existing Megamax switchboards, allowing for an upgrade without modifying the entire panel.