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Siemens 5SP4280-8 2-Pole Miniature Circuit Breaker, Type D

Siemens 5SP4280-8 2-pole Type D Miniature Circuit Breaker.

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ManufacturerSiemens

Part number5SP4280-8

Poles 2

Type D

Rated current (In) 80 A

Rated breaking capacity (Icn) 10 kA

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2-pole design Type D tripping characteristic 80A current rating 10kA breaking capacity 400V AC operational voltage Designed for high inrush currents

Product description

The Siemens 5SP4280-8 is a 2-pole Miniature Circuit Breaker (MCB) featuring a Type D tripping characteristic. It is designed for circuits requiring protection against overloads and short circuits, with a rated current of 80 A, a breaking capacity of 10 kA, and an operational voltage of 400 V AC. The Type D characteristic makes it suitable for high inrush current applications.

This MCB is ideal for protecting equipment with significant inductive loads, such as motors, transformers, and solenoids, which can draw a large current surge upon startup. Its 2-pole configuration ensures that both live and neutral conductors are disconnected simultaneously for safety. The unit has a width of 70 mm (D=70 mm), contributing to space-saving installations in electrical panels.

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Technical specifications

Poles	2
Type	D
Rated current (In)	80 A
Rated breaking capacity (Icn)	10 kA
Rated operational voltage (Un AC)	400 V
Frequency	50/60 Hz
Width	70 mm
Mounting	DIN rail

Common applications

Motor protection circuits

Industrial machinery

Transformer protection

Solenoid circuits

High-inductance loads

Power distribution panels

Compatible systems

Standard DIN rail mounting Circuits with high inrush current loads

Also known as

Siemens 5SP4280-8 MCB Siemens 80A 2P Type D breaker Siemens 400V industrial breaker

Replaces / compatible with

This 2-pole, Type D MCB is specifically designed for applications with high inrush currents. It can replace older Siemens or compatible 2-pole MCBs with similar voltage, current, and breaking capacity ratings used in demanding industrial settings.

Technical note

Expert tip

Using a Type D breaker is essential for circuits with high inductive loads to prevent nuisance tripping, but it should not be used for standard lighting or socket circuits where Type B or C is more appropriate.

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Frequently asked questions

When should I use a Type D circuit breaker like the Siemens 5SP4280-8?

A Type D circuit breaker, such as the Siemens 5SP4280-8, is recommended for circuits supplying equipment that experiences very high inrush currents upon startup. This includes devices like large motors, transformers, or welding equipment, where the initial current can be 10 to 20 times the rated current. Type D breakers are designed to withstand these surges without tripping, providing protection against short circuits.