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The Siemens 5SY4440-8 is a 4-pole miniature circuit breaker designed for industrial applications. It offers a rated current of 40A and a rated voltage of 400V AC, with a significant switching capacity of 10kA according to EN 60898.
This circuit breaker utilizes a D-curve tripping characteristic, making it suitable for applications with high inrush currents, such as motor loads. It is designed for DIN rail mounting, ensuring easy installation in control panels and distribution boards. The device also features a mechanical service life of 10,000 switching cycles.
Key technical specifications include an insulation voltage of 440V, an overvoltage category of III, and a degree of pollution of 3. The breaker is halogen-free and silicon-free, contributing to environmental safety. It supports a wide range of conductor cross-sections, from 0.75 mm² to 35 mm² for solid and stranded wires.
| Qty | Low | High |
|---|---|---|
| 1+ | $0.99 | $0.99 |
Estimated market price range - modelled values for guidance only, not live distributor offers.
The operational current is rated at 40A at 35°C and decreases slightly at higher temperatures, down to 33.92A at 60°C.
The rated supply voltage at AC is 400V, and the insulation voltage (Ui) is 440V for both single-phase and multi-phase operation.
The switching capacity is 10kA according to EN 60898 and 15kA according to IEC 60947-2.
It features a D-curve tripping characteristic.
It is designed for DIN rail mounting using a quick assembly system.
Yes, the product feature indicates it is halogen-free.