ABB S4 SACE Circuit Breaker

Core Performance & Industrial Application

The ABB S4 is the SACE Isomax S4 molded case circuit breaker on a 250 A frame for low-voltage distribution protection.

The electronic trip unit is adjustable 100-250 A continuous; PR211 provides LI (long-time/instantaneous), PR212 adds LSI or LSIG with short-time and ground-fault protection.

Three breaking levels: N 25 kA, H 65 kA, L 100 kA at 480 VAC per UL489; fixed, plug-in or withdrawable versions available.

Adjustable long-time overload and instantaneous short-circuit settings; suitable for reverse feed applications.

It serves as spare replacement in main and feeder distribution panels.

Technical Specifications

▶ Product type: Molded case circuit breaker (MCCB)

▶ Brand: ABB SACE Isomax S series

▶ Model: S4 (250 A frame)

▶ Frame rating: 250 A; trip adjustable 100-250 A; rated voltage 600 VAC

▶ Trip units: PR211 LI / PR212 LSI or LSIG electronic

▶ Breaking: N 25 kA, H 65 kA, L 100 kA @480 VAC (UL489)

▶ Poles: 2P / 3P (UL/CSA); 4P (UL/IEC)

▶ Versions: B LI, C LSI, E LSIG, Q 100% UL, D molded switch, M magnetic-only

▶ Dimensions: 254×105×103 mm (10.0×4.13×4.07 in)

▶ Feature: Adjustable L/S/G/I, field-accessory mounting, reverse-feed capable

▶ Note: Exact frame current, poles, trip type and breaking level confirmed from nameplate before ordering

▶ Country of origin: Italy

▶ Compliance: CE, UL489, CSA C22.2 certification

Industry Applications

Applied in LV main/feeder protection, motor and distribution panel MCCB spare replacement on legacy Isomax S installations.

Note: Confirm catalog code, trip unit, pole count and breaking level against nameplate before ordering