# Circuit Breaker, MCB, 5SP3, 1P, 25 kA, 400 V, 20 A

![Product image](https://novapart.co/image/farnell:3475584/)

**URL**: https://novapart.co/products/5SP3720-3/circuit-breaker-mcb-5sp3-1p-25-ka-400-v-20-a
**SKU**: 5SP3720-3
**Manufacturer**: SIEMENS
**Price**: €91.2500
**Stock**: 10+

## Specifications

| Parameter | Value |
|---|---|
| Product Range | SENTRON Series |

## Datasheet

📄 [Download PDF](https://novapart.co/datasheet/farnell:3475584/)

**5SP3720-3** 

**Data sheet** 

Main miniature circuit breaker (SHU), 1-pole, E 20, 230/400 V 

|off|Main miniature circuit breaker (SHU), 1-pole, E 20, 230/400 V|
|---|---|
|**Model**<br>~~a~~||
|**product brand name**<br>~~a~~|SENTRON<br>~~a~~|
|**product designation**|Miniature circuit breaker|
|**design of theproduct**|Main miniature circuit breaker|
|**design of the locking device**|Integrated lockingslide, lockable bymeans of a lock, wire seal and cable ties|
|**General technical data**<br>~~ee~~||
|**number ofpoles**<br>~~ee~~|1|
|**design ofpole**|1P|
|**tripping characteristic class**|E|
|**mechanical service life(operating cycles) typical**|20 000|
|**overvoltage category**|4|
|**degree of pollution**|3|
|**Voltage**<br>~~ee~~||
|insulation voltage(Ui)rated value<br>~~ee~~|690 V|
|surge voltage resistance rated value|6 kV|
|**supply voltage with single-phase operation at AC rated**<br>**value**|230 V|
|||
|**● operational current**||
|— at 30 °C rated value|20 A|
|**— at 40 °C rated value**|19 A|
|— at 50 °C rated value|18 A|
|— at 55 °C rated value|17.5 A|
|**● operational current at AC rated value**|20 A|
|**Supply voltage**<br>~~a~~||
|supplyvoltage at AC<br>~~a~~|230 V<br>~~a~~|
|**operating voltage rated value**||
|● minimum|110 V|
|● maximum|440 V|
|supplyvoltage frequencyrated value<br>~~a~~|50 Hz<br>~~a~~|
|**Protection class**<br>~~a~~||
|**protection class IP**<br>~~a~~|IP40, with connected conductors<br>~~a~~|
|**Breaking Capacity**<br>~~a~~||
|**switching capacity current**<br>~~a~~|~~a~~|
|● rated value|25 kA|
|● accordingto EN 60898 rated value<br>~~a~~|25 kA<br>~~a~~|
|**Dissipation**<br>~~a~~||
|power loss [W] for rated value of the current at AC in hot<br>~~a~~|6 W<br>~~a~~|



|operatingstateperpole|operatingstateperpole||
|---|---|---|
|**suitability for operation**<br>~~re~~||Residential buildings/infrastructure<br>~~re~~|
|**Product details**|||
|**product component**|||
|**● infeed at box terminal**||Yes|
|● saddle terminals||Yes|
|**product feature properties for main switches in accordance**<br>**with EN 60204-1**<br>~~re~~||Yes<br>~~re~~|
|**product feature sealable**<br>~~re~~||Yes<br>~~re~~|
|**Display and operation**|||
|displayversion for switch position indicator||OFF =green, ON = red|
|**Connections**<br>~~a~~|||
|**connectable conductor cross-section of the box terminal**<br>~~a~~||~~a~~|
|● solid minimum||2.5 mm²|
|● solid maximum||50 mm²|
|● stranded minimum||2.5 mm²|
|● stranded maximum||50 mm²|
|**connectable conductor cross-section solid**|||
|● minimum||2.5 mm²|
|● maximum||50 mm²|
|**connectable conductor cross-section stranded**|||
|● minimum||2.5 mm²|
|● maximum||50 mm²|
|**connectable conductor cross-section finely stranded with**<br>**core endprocessing**|||
|● minimum||2.5 mm²|
|● maximum<br>~~re~~||50 mm²<br>~~re~~|
|**position of power supply cord**<br>~~re~~||Any<br>~~re~~|
|**Mechanical Design**|||
|**height**||128 mm|
|**depth**||76.3 mm|
|**depth of the enclosure**||76.3 mm|
|**number of modular width units**||1.5|
|**fastening method**||DIN rail|
|fasteningmethod other<br>~~re~~||on DIN rail 35 mm acc. to EN 60715<br>~~re~~|
|**Net Weight**<br>~~re~~||429g<br>~~re~~|
|**Environmental conditions**|||
|**shock resistance**||30g, at least 3 impacts, impact duration 11 ms|
|**vibration resistance according to IEC 60068-2-6**||2g, 20 frequencycycles 5 to 150 to 15 Hz|
|**ambient temperature during operation**|||
|● minimum||-25 °C|
|● maximum||55 °C|
|**ambient temperature during storage**|||
|● minimum||-40 °C|
|● maximum||70 °C|
|**Approvals Certificates**<br>~~ee~~|||
|**Environment**<br>~~ee~~|**General Product Approval**<br>~~ee~~||



## **other** 

Confirmation 

5SP37203 Page 2/5 

Subject to change without notice © Copyright Siemens 

6/4/2026 

## **Further information** 

**Information on the packaging** https://support.industry.siemens.com/cs/ww/en/view/109813875 **Information for data generation and storage** https://support.industry.siemens.com/cs/ww/en/view/109995012 

**Information- and Downloadcenter (Catalogs, Brochures,…)** https://www.siemens.com/lowvoltage/catalogs 

**Industry Mall (Online ordering system)** https://mall.industry.siemens.com/mall/en/en/Catalog/product?mlfb=5SP3720-3 

**Service&Support (Manuals, Certificates, Characteristics, FAQs,...)** https://support.industry.siemens.com/cs/ww/en/ps/5SP3720-3 

**Image database (product images, 2D dimension drawings, 3D models, device circuit diagrams, ...)** https://www.automation.siemens.com/bilddb/cax_en.aspx?mlfb=5SP3720-3 **CAx-Online-Generator** https://www.siemens.com/cax 

**Tender specifications** https://www.siemens.com/specifications 

**Characteristic curves** https://curves.simaris.siemens.com/curves/<mmp_prod_noCOMP="HAUPT"></mmp_prod__no> 

**==> picture [203 x 225] intentionally omitted <==**

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Subject to change without notice © Copyright Siemens 

6/4/2026 

~~{~~ 1 S 4 2 

**last modified:** 7/22/2025 

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Subject to change without notice © Copyright Siemens 

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Subject to change without notice © Copyright Siemens 

6/4/2026 



## Links

- [View this product on Novapart](https://novapart.co/products/5SP3720-3/circuit-breaker-mcb-5sp3-1p-25-ka-400-v-20-a)
- [Request a quote for this part](https://novapart.co/quote/)
- [Supplier page](https://es.farnell.com/siemens/5sp3720-3/rcbo-rcd-gfci-afdd-circuit-breakers/dp/3475584)
---

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