Product Introduction

Model Interpretation

• SACE: ABB low‑voltage breaker series brand.

• E3: Frame size E3 (3200A class).

• S: High breaking capacity version.

• 32: Frame rated current 3200A.

• Full model example: E3S 3200 PR121/P‑LI 3P W MP.

Technical Parameters

• Rated uninterrupted current Iu: 3200A.

• Rated operating voltage Ue: AC up to 690V, 50/60Hz.

• Rated ultimate short‑circuit breaking capacity Icu: 75kA at 380–690V.

• Rated short‑time withstand current Icw: 75kA for 1s.

• Trip unit: PR121/P (LI: overload + instantaneous short circuit).

• Poles: 3‑pole or 4‑pole.

• Mounting: fixed or withdrawable.

• Wiring: rear horizontal or rear vertical.

• Mechanical life: typically 20,000 operations.

• Electrical life (440V): around 9,000 operations.

• Protection degree: IP20 (standard).

• Ambient temperature: −5°C to +40°C, ≤95%RH non‑condensing.

Interface and Communication Configuration

• Standard auxiliary contacts: 4NO + 4NC for status signalling.

• Basic PR121/P trip unit: no built‑in communication.

• Local indication: LED status lights, local test/reset pushbutton.

• Communication option: upgradeable to PR122/P with Modbus or Profibus.

• Terminals: standardised design for stable power and control wiring.

Core Functions

• Overload protection (L): inverse time, Ir=0.4–1.0×In adjustable.

• Instantaneous short‑circuit protection (I): IΔ=1–10×In adjustable.

• Normal switching and electrical isolation for distribution circuits.

• Local status indication, manual test and reset.

• High breaking capacity to clear severe short‑circuit faults safely.

Application Scenarios

• Main incoming and bus coupler circuits in industrial and commercial LV distribution systems.

• Protection and control for large transformers and heavy‑duty motor circuits.

• Power distribution rooms in factories, high‑rise buildings, data centres and public facilities.

• Critical installations requiring high reliability and high short‑circuit withstand capability.

Operation and Maintenance Instructions

• Install in cabinet according to selected mounting type; tighten all connections to specified torque.

• Periodically inspect LED indicators and operating status during normal service.

• Keep the breaker clean; remove dust build‑up at regular intervals.

• Check terminals and contacts for tightness and overheating signs.

• Electronic trip unit is maintenance‑free.

• Isolate upstream power completely before any inspection or maintenance.

• Replace damaged components or the whole breaker if abnormal operation occurs.