Germany Siemens / Siemens 5SY4120-8

5SY4120-8 Introduction: Siemens MCB Miniature Circuit Breaker, 1-pole, 20 A, Type D trip characteristics

Germany Siemens/Siemens 5SY4120-8 picture display

Model features introduced

Automatic cut-out, 5SY4 series, 10kA, type B, type C and type D characteristics
Siemens miniature circuit breakers offer the highest quality and reliability. The excellent technical characteristics of the equipment mean that you are always safe and reliable. In addition to this, you can also benefit from innovative mounting options that allow for quick and easy installation. Siemens' miniature circuit breakers can be combined with a variety of complementary components as required, such as control current switches, fault signal contacts, shunt releases, undervoltage releases, remote operating mechanisms or RCCB units to protect personnel and prevent fires.

Features and Benefits:

Automatic cut-out, 1-, 2-, 3- and 4-pole DIN rail assemblies for the industrial, functional and residential construction industries support quick and easy removal from components
standard

IEC60898 - for low-voltage circuit breakers, suitable for household and similar installations. Known as miniature circuit breakers (MCBs) in the United Kingdom.
Q: What are the differences between trip curves B, C, and D?

A: Curve B: Trip: 3 to 5 times the rated current. Application: Protection of generators, personnel, very long cable curves C: Tripping: 5 to 10 times the rated current Application: Protection circuits and general application curves D: Tripping: 10 to 14 times the rated current Application: Protecting high surge circuits, welders, transformers and electric motors

Voltage Rating:	230V/400V AC, 250V/440V AC, 60V DC/pole
Suppression Rating:	10kA
Installation Depth:	70mm

SiemensRCD、RCBO、RCCB和MCB
The Type B feature provides an instantaneous short-circuit response level of 3-5 times the normal rated current, making it suitable for circuits with moderate inrush currents, such as incandescent lamps, heated loads, and most residential/small building protection applications. The Type C feature provides a short-circuit response of 5-10 times the normal rated current, making it suitable for higher inrush current circuits, such as motor control and fluorescent lamp installations in factories where noise-induced tripping may occur if a faster type is used. The D-type feature is designed for high inrush current loads. Magnetic trip point - 10 to 20 times rated. Thermal trigger point - 1.13 to 1.45 rated protector. The AC type feature ensures disconnection when a sinusoidal, direct current is applied quickly or slowly increased.

Model parameters are introduced

attribute	numeric value
range	Sentron
series	5SY4
Number of poles	1
Current rating	20A
Trip characteristics	Type D
Rated AC voltage	230/400V
Breaking capacity	10kA
length	89.8mm
width	17.6mm
depth	76.4mm

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Germany Siemens / Siemens 5SY4120-8

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