5SP4392-7

Siemens 5SP4392-7 Three-Pole High Current Circuit Breaker 125A C-Curve 10kA
Siemens 5SP4392-7 Three-Pole High Current Circuit Breaker 125A C-Curve 10kA

The 5SP4392-7 is a Siemens SENTRON 5SP4 high-current miniature circuit breaker. It is a three-pole circuit breaker with a rated current of 125A, C-curve thermomagnetic trip, a rated voltage of 400V AC, and a breaking capacity of 10kA according to EN 60898. It is suitable for high-current power circuits with starting current, such as motors and transformers.

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Product Introduction
Product Positioning

Both 5SP4392-7 and 5SP4392-6 are 125A three-pole specifications. The difference is that they adopt a C-curve, which has a higher instantaneous trip threshold and can withstand the inrush current of motors, transformers and general mixed loads without tripping falsely. They are suitable for use as main switches in factory power panels and distribution panels and for high-current circuits.

Core Product Advantages and Features
125A Tripolar Protection
With simultaneous opening and closing of three poles, rated current 125A (30°C reference), it can be used as the main circuit breaker for three-phase power distribution.
C-curve withstands inrush current
The C-curve is suitable for loads with medium starting current, such as motors, transformers, and general power equipment, reducing the chance of false tripping.
10kA breaking capacity
According to EN 60898, the rated breaking capacity is 10kA, the rated voltage is 400V AC, and the insulation voltage is 440V AC.
Complete temperature descent data
The rated current is 118.75A at 40°C and 108.75A at 55°C. The official data provides complete derating information to facilitate the selection of internal heatsink design.
project Specification
series SENTRON 5SP4
Extreme number 3 poles
Rated current 125A
breakaway curve C
Rated voltage 400V AC
Breaking capacity 10kA (EN 60898)
Width/Installation Depth 4.5 module (81mm) / 70mm
Wiring cross-sectional area 25–50 mm²