ABB SACE FORMULA MCCBs provide compact, fixed-installation circuit protection in A0, A1, A2 and A3 frame sizes up to 630 A. The range includes factory-set thermomagnetic, magnetic-only and electronic trip-unit options, with breaking capacities up to 50 kA at 415 V AC on specified A1–A3 versions.
The ABB SACE FORMULA DSA Molded Case Circuit Breaker (MCCB) series is designed for reliable overload and short-circuit protection in industrial, commercial and OEM electrical installations. Covering rated current options from 15 A to 630 A across four frame sizes, A0, A1, A2 and A3, the series combines compact dimensions with straightforward product selection and installation. Featuring thermal-magnetic protection, selected electronic trip unit options and a range of compatible accessories, FORMULA DSA provides practical circuit protection for standard power distribution and motor protection applications.
The FORMULA DSA series primarily uses fixed thermal-magnetic trip units to provide overload and short-circuit protection. The thermal release responds to sustained overload conditions, while the magnetic release provides rapid circuit interruption during short-circuit faults. Selected A3 configurations also offer electronic trip unit options for additional protection flexibility. These features make the series suitable for standard industrial and commercial electrical distribution requirements.
Designed to optimize space inside electrical enclosures, the FORMULA DSA series features a compact molded-case structure with reduced installation depth. A0, A1 and A2 frames have a depth of approximately 60 mm, while the larger A3 frame has a depth of approximately 103.5 mm. The fixed-mounted design and front terminal connections simplify installation in distribution panels and control cabinets. Selected frame sizes also support DIN-rail mounting, providing additional installation flexibility.
The FORMULA DSA series supports a range of field-installable accessories to accommodate different electrical control and installation requirements. Available accessories include auxiliary contacts, shunt opening releases, undervoltage releases, rotary handles, terminal covers, phase separators and locking devices. These options support remote signaling, circuit control and safe operating arrangements in industrial electrical systems.
The ABB SACE FORMULA DSA MCCB series is suitable for standard power distribution and equipment protection in industrial and commercial installations. Typical applications include:
Commercial Buildings: Circuit protection in distribution panels and building electrical systems.
Industrial Facilities: Overload and short-circuit protection for electrical equipment and distribution circuits.
OEM Control Panels: Compact circuit protection for machinery and electrical control assemblies.
Motor Protection: Selected configurations for motor feeder protection with compatible trip units.
Power Distribution: Branch circuit protection in low-voltage switchboards and electrical enclosures.
Frame Sizes: A0, A1, A2 and A3.
Rated Current: 15–630 A for IEC versions.
Breaking Capacity: Up to 50 kA at 415 V AC, depending on frame and performance level.
Pole Configuration: 1P, 2P, 3P and 4P, depending on frame.
Trip Units: Thermal-magnetic TMF, with selected electronic and magnetic-only options.
Installation: Fixed-mounted versions; DIN-rail mounting available for selected frame sizes.
Connection: Standard front terminal arrangements.
Accessories: Auxiliary contacts, shunt releases, undervoltage releases, rotary handles and terminal accessories.
Standards: IEC 60947-2 for IEC versions; UL 489 and CSA C22.2 for applicable UL/CSA versions.
| Parameter | Specification |
| Product range | FORMULA A0 / A1 / A2 / A3; fixed MCCBs, 3P or 4P |
| Rated current | Up to 630 A (A1: 15–125 A; A2: 125–250 A; A3: 320–630 A) |
| Breaking capacity (Icu) | 10–50 kA at 415 V AC across listed A1–A3 classes |
| Electrical ratings | Ue 550 V AC / 250 V DC; Ui 690 V; Uimp 6 kV (A1–A3) |
| Trip units | TMF, MF, ELT LI and ELT I (frame-dependent) |
| Installation and dimensions | A0/A1/A2 depth 60 mm; A3 depth 103.5 mm; fixed mounting |
| Operating conditions | –25 °C to +70 °C; no altitude derating up to 2,000 m (A1–A3) |
| Standards | IEC 60947-2; GB/T 14048.2 |
Available frame and breaking-capacity designations are listed below. Breaking-capacity values apply at 415 V AC where specified.
| Model / class | Class | Frame current (Iu) | Icu at 415 V |
| FORMULA A0 | — | 100 A | — |
| FORMULA A1 A | A | 125 A | 10 kA |
| FORMULA A1 B | B | 125 A | 18 kA |
| FORMULA A1 C | C | 125 A | 25 kA |
| FORMULA A1 N | N | 125 A | 36 kA |
| FORMULA A2 B | B | 250 A | 18 kA |
| FORMULA A2 C | C | 250 A | 25 kA |
| FORMULA A2 N | N | 250 A | 36 kA |
| FORMULA A3 N | N | 400 / 630 A | 36 kA |
| FORMULA A3 S | S | 400 / 630 A | 50 kA |
| Type | Frame range | Protection / application |
| TMF | A1–A3 (to 500 A) | Fixed thermal and magnetic protection for distribution circuits. |
| MF | A1–A3 (to 400 A) | Magnetic-only protection for specified fire-service loads. |
| ELT LI | A3 (630 A) | Electronic overload and instantaneous short-circuit protection. |
| ELT I | A3 (500 A) | Magnetic-only electronic protection for fire-service circuits. |
| Model configuration | ABB reference |
| A1 C, 125 A, 3P, TMF | 1SDA066720R1 |
| A2 N, 125 A, 3P, TMF | 1SDA066781R1 |
| A3 N, 320 A, 3P, TMF | 1SDA066560R1 |
| A3 S, 500 A, 3P, TMF | 1SDA066565R1 |
| A3 N, 630 A, 3P, ELT LI | 1SDA066566R1 |
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