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Siemens 5SM3642-4 4-Pole Residual Current Circuit Breaker - 25A, 300mA Type B

Siemens 5SM3642-4 4-pole Type B Residual Current Circuit Breaker.

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ManufacturerSiemens

Part number5SM3642-4

Poles 4

Type B

Delay Short-time delayed

Rated Current (In) 25 A

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4-Pole Design Type B Residual Current Detection Short-Time Delayed 300mA Sensitivity 400V AC Rating Overcurrent and Earth Fault Protection

Product description

The Siemens 5SM3642-4 is a 4-pole Residual Current Operated Circuit Breaker (RCCB) designed for robust electrical protection. It features a Type B characteristic, indicating its sensitivity to both AC and pulsating DC residual currents, making it suitable for a wider range of applications. This unit is short-time delayed, rated for 25 A and a residual current sensitivity of 300 mA, with an operating voltage of 400 V AC. It provides essential protection against electric shock and fire hazards caused by earth faults.

This circuit breaker is commonly used in industrial settings, commercial buildings, and residential installations where reliable protection against residual currents is critical. Its Type B classification makes it particularly useful in applications involving electronic equipment that may generate pulsating DC residual currents, such as frequency converters, solar inverters, and medical equipment. The 4-pole design ensures complete isolation for three-phase systems.

Stanlo Automation, a veteran-owned surplus parts distributor, is your source for the Siemens 5SM3642-4. We ensure you receive quality components for your electrical distribution and protection needs, backed by reliable service and expertise.

Technical specifications

Poles	4
Type	B
Delay	Short-time delayed
Rated Current (In)	25 A
Residual Current (In)	300 mA
Rated Voltage (Un) AC	400 V
Mounting	DIN Rail

Common applications

Industrial Electrical Panels

Commercial Building Distribution

Residential Electrical Systems

Data Centers

Renewable Energy Systems

Motor Protection

Compatible systems

Standard DIN rail mounting Compatible with Siemens low-voltage distribution systems

Also known as

Siemens 5SM3 Siemens 4-pole RCCB 5SM3 25A 300mA Type B

Replaces / compatible with

This part is a specific Siemens RCCB model. For replacements, ensure the new device matches the pole count, current rating, residual current sensitivity, and type characteristics (A, B, F, etc.) required by the installation.

Technical note

Expert tip

Type B RCCBs are essential for installations with electronic equipment that can introduce pulsating DC fault currents, offering broader protection than standard Type A devices.

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Frequently asked questions

What is the key advantage of the Siemens 5SM3642-4's Type B classification?

The Siemens 5SM3642-4's Type B classification means it can detect not only AC residual currents but also pulsating DC residual currents. This is crucial for protecting circuits with electronic devices like variable speed drives or UPS systems that can generate such fault currents.