ABB Sace ISOMAX S4 Molded Case Circuit Breaker

Core Performance & Industrial Application

The ABB Sace ISOMAX S4 is a classic molded case circuit breaker belonging to the ABB SACE Isomax S series, now an obsolete legacy model.

Its frame current covers 160A to 250A, supporting AC and DC power distribution protection.

It can be fitted with thermomagnetic trip units or microprocessor electronic releases PR211/P, PR212/P and PR212/MP for motor protection.

Multiple breaking capacity grades including N, H, L are optional, suitable for different short-circuit current conditions.

It supports fixed, plug-in and withdrawable installation forms, can be equipped with auxiliary contacts, shunt trip and undervoltage release accessories.

It provides overload, short-circuit and earth fault protection, widely used in cabinet power distribution, motor control and backup power circuits.

It is commonly used as spare replacement for old industrial panels, power plants and factory low voltage systems.

Technical Specifications

▶ Product type: Molded Case Circuit Breaker (MCCB)

▶ Brand: ABB SACE

▶ Model: ISOMAX S4

▶ Frame current: 160 ~ 250 A

▶ Rated operational voltage: Up to 690V AC

▶ Poles: 3 pole / 4 pole optional

▶ Trip unit: Thermomagnetic or PR211 / PR212 electronic release

▶ Breaking capacity class: N, H, L optional

▶ Installation type: Fixed, plug-in, withdrawable

▶ Mechanical life: 25000 operations

▶ Electrical life: 8000 operations at 415V

▶ Accessories: Auxiliary switch, alarm contact, shunt trip, undervoltage release

▶ Protection function: Overload, short circuit, earth fault (optional)

▶ Operating temperature: -25℃ ~ +70℃

▶ Protection rating: IP40 (front face when installed in cabinet)

▶ Feature: Current limiting structure, flexible protection configuration, mature stable design

▶ Country of origin: Italy

▶ Compliance: IEC60947-2, CE certification

Industry Applications

Applied for replacement maintenance of old low-voltage distribution cabinets, factory power systems, water treatment and marine power panels.

Note: Confirm rated current, trip type, pole number and breaking capacity before ordering