Industrial circuit breaker | 3P | 250A | 50kA | adjustable | IP20 | Promfactor Baltic | FMC3E

Technical Specifications

Standard: IEC/EN 60947-2
Number of poles: 3P
Rated current (In): 250 A
Rated voltage (Ue): ~415 V / ~690 V
Insulation voltage (Ui): 800 V
Impulse withstand voltage (Uimp): 8000 V
Frequency: 50/60 Hz

Breaking Capacity

Icu (AC 380/415V): 50 kA
Ics (AC 380/415V): 35 kA
Icu (AC 690V): 10 kA
Ics (AC 690V): 7 kA

Long-time current Ir1: 100–250 A
Long-time delay t1: 12–150 s (+OFF)
Short-time pickup current Ir2: 2–12 × Ir1
Short-time delay t2: 0.06–0.3 s (+OFF)
Instantaneous protection Ir3: 4–14 × Ir1 (+OFF)
Short-time protection adjustment Iro: 0.7–1 × Ir1

Protection class: IP20
Electrical / mechanical endurance: 2,500 / 8,500 cycles
Ambient temperature: -25…+55 °C
Storage temperature: -25…+70 °C
Altitude: up to 2000 m
Front and rear busbar connection: Yes
Additional accessories: Can be connected

Functions and Advantages

Electronic trip unit – precise and stable adjustment of protection parameters
Adjustable long-time protection – overload protection
Short-time protection – selectivity between multiple protection levels
Instantaneous protection – fast response to short circuit
High breaking capacity (50 kA) – suitable for high-power systems
Wide adjustment range – suitable for various load types

Applications

For electricians: Excellent solution for protection of main distribution boards, transformer inputs, generators, and motor lines. The electronic module allows quick adjustment according to load requirements.

For engineers and electrical system designers: Suitable for automation systems, infrastructure facilities, industrial equipment where precisely adjustable and remotely controllable protection is required.

For industrial or commercial users: Provides long-term network stability and safety, reduces the risk of equipment damage, and ensures uninterrupted power supply.

Advantages

High 50 kA breaking capacity
Electronic, precisely adjustable trip unit
Selectivity capability
Suitable for networks up to 690 V
Wide protection setting range
Compatible with additional accessories

Disadvantages

Professional installation required
IP20 – suitable for installation inside a cabinet only