Product Description

Siemens 3NP1123-1CA20 SENTRON Fuse Switch Disconnector – 160A, 3-Pole, NH000

The Siemens 3NP1123-1CA20 is a SENTRON 3NP1 fuse switch disconnector designed for low-voltage power distribution, switching and fuse-based circuit protection applications. The exact article is a 3-pole, 160 A device for NH000 fuse links, designed for mounting-plate installation, with box terminals and a 45 mm cover level. Siemens currently lists the product as an active product.

For SB Smart, this product is positioned as a Siemens industrial electrical switching and protection component for supply, procurement, panel assembly, replacement and maintenance requirements.

Siemens 3NP1123-1CA20 Fuse Switch Disconnector

The 3NP1123-1CA20 belongs to the Siemens SENTRON 3NP1 Fuse Switch Disconnectors up to 630 A family. Siemens identifies the exact article as a 3-pole, NH000, 160 A fuse switch disconnector intended for assembly and installation on a mounting plate.

A fuse switch disconnector combines switching and fuse-disconnection functions in one device. The compatible NH fuse link provides overcurrent protection, while the fuse switch disconnector provides a means of switching and isolating the associated circuit.

160 A Rated Current

The exact 3NP1123-1CA20 has a rated operational current of 160 A at the specified conditions. Siemens technical data also provides temperature-dependent current values, with the permissible operational current decreasing as ambient temperature increases.

The documented current values include:

• 160 A at 35°C

• 150 A at 40°C

• 140 A at 45°C

• 130 A at 50°C

• 120 A at 55°C

This temperature information should be considered during panel design and application.

Three-Pole Construction

The 3NP1123-1CA20 is a 3-pole fuse switch disconnector. Siemens' official product data confirms the three-pole configuration.

The three-pole construction makes the device suitable for compatible three-phase low-voltage distribution and feeder applications.

NH000 Fuse Compatibility

The exact 3NP1123-1CA20 is designed for NH000 fuse links. Siemens' official product description specifically identifies the fuse-link size as NH000.

The fuse link installed in the device should be selected according to its current rating, voltage rating, utilization category, breaking capacity and the requirements of the protected circuit.

Without Fuse Monitoring

The 3NP1123-1CA20 is the version without fuse monitoring. Siemens' official technical data identifies the safety-monitoring design as “Without”, while also indicating that optional fuse monitoring is available as a product extension.

This makes the exact article suitable where integrated fuse-status monitoring is not required.

Mounting-Plate Installation

The 3NP1123-1CA20 is designed for assembly and installation on a mounting plate. Siemens specifies floor mounting as available and identifies the fastening method as a mounting plate.

The device can be installed in a horizontal or vertical mounting position according to Siemens' technical data.

Box Terminal Connection

The exact article uses a box terminal connection. Siemens' product description identifies the device as the box-terminal version, distinguishing it from related flat-terminal 3NP1 variants.

The technical data allows compatible conductor cross-sections from 1.5 mm² to 50 mm² for solid or stranded conductors, with finely stranded conductors up to 35 mm², subject to the specified terminal conditions.

45 mm Cover Level

The 3NP1123-1CA20 has a 45 mm cover level. Siemens includes this dimension in the official product description.

The cover level is important when planning enclosure dimensions, protective covers and the location of adjacent panel components.

690 V Rated Insulation Voltage

Siemens specifies a 690 V rated insulation voltage for the exact 3NP1123-1CA20. The technical documentation also lists 8 kV rated surge withstand voltage.

The actual operating voltage and switching category must be checked against the complete installation and the selected fuse links.

LV HRC Fuse System

The 3NP1123-1CA20 uses an LV HRC fuse system. Siemens technical data identifies the fuse system as LV HRC fuse.

This makes the device suitable for compatible low-voltage power-distribution applications using NH-type HRC fuse links.

Short-Circuit Performance

Siemens' technical data provides several short-circuit characteristics for the exact 3NP1123-1CA20, including:

• 80 kA at AC 240 V with high-speed activation

• 80 kA at AC 500 V with high-speed activation

• 50 kA at AC 690 V with high-speed activation

• Up to 120 kA with the switch closed at AC 240 V and 500 V

• Up to 100 kA with the switch closed at AC 690 V

These values should be interpreted according to the specified operating conditions and protection coordination of the complete installation.

Switching and Isolation Function

A fuse switch disconnector provides switching and isolation for circuits protected by compatible fuse links.

The SENTRON 3NP1 family is intended for low-voltage power distribution applications and is available in different current ratings and pole configurations up to 630 A. The 3NP1123-1CA20 is the 160 A, 3-pole, NH000 configuration with box terminals.

The device should always be operated within its specified electrical ratings and applicable safety procedures.

Mechanical Service Life

Siemens lists a typical mechanical service life of approximately 2,000 operating cycles for the exact 3NP1123-1CA20.

Actual service life can vary depending on switching frequency, electrical load, environmental conditions and installation practices.

Environmental Conditions

The exact Siemens technical data specifies an operating ambient temperature range of approximately -25°C to +55°C and a storage temperature range of approximately -50°C to +80°C.

These limits should be considered when installing the device in industrial electrical panels or distribution assemblies.

Suitable for Industrial Distribution Applications

The 3NP1123-1CA20 can be considered for compatible applications such as:

• Industrial distribution panels

• Three-phase feeder protection

• Low-voltage power distribution

• Electrical switchboards

• Industrial power feeders

• Fuse-based circuit protection

• Electrical equipment isolation

• Panel maintenance and replacement applications

Actual application should be based on the system voltage, load current, fuse selection, prospective short-circuit current and protection coordination.

Fuse Replacement and Maintenance

The 3NP1 fuse switch disconnector is useful where compatible NH000 fuse links need to be installed in a dedicated switching and isolation assembly.

When replacing an existing unit, verify:

• Rated current

• Number of poles

• NH fuse size

• Fuse rating

• Terminal configuration

• Cover level

• Mounting arrangement

• Fuse monitoring requirement

• System voltage

• Protection coordination

Standardized Siemens 3NP1 Range

The Siemens 3NP1 range includes multiple configurations for different current ratings, pole counts, fuse sizes, terminal arrangements and monitoring options. The 3NP1123-1CA20 represents the 160 A, 3-pole, NH000, box-terminal, 45 mm cover-level configuration.

This allows industrial buyers to select a suitable 3NP1 variant according to the required electrical and mechanical configuration.

Active Siemens Product

Siemens currently identifies the 3NP1123-1CA20 as PLM PM300: Active Product. The product is listed in the SENTRON 3NP1 Fuse Switch Disconnectors family.

This is useful for procurement and replacement sourcing when checking the current Siemens product status.

Suitable for Electrical Panel Builders and Industrial Buyers

The Siemens 3NP1123-1CA20 is relevant for:

• Electrical panel builders

• Industrial buyers

• Maintenance departments

• Electrical contractors

• OEM equipment maintenance

• Electrical product dealers

• Replacement-part procurement

For SB Smart, the product is positioned around industrial electrical product supply and procurement, without claiming automation integration or automation-service work.

Key Features

• Siemens SENTRON 3NP1 fuse switch disconnector

• Article number 3NP1123-1CA20

• 160 A rated current

• 3-pole

• NH000 fuse-link size

• Without fuse monitoring

• Mounting-plate installation

• Box terminals

• 45 mm cover level

• 690 V rated insulation voltage

• 8 kV rated surge withstand voltage

• LV HRC fuse system

• Typical mechanical service life: 2,000 operating cycles

• Operating ambient temperature: -25°C to +55°C

• Active Siemens product

Benefits

• 160 A capacity: Suitable for compatible industrial feeder and distribution applications.

• 3-pole design: Suitable for compatible three-phase electrical systems.

• NH000 compatibility: Supports the specified Siemens NH fuse-link size.

• Fuse switch disconnection: Combines switching and fuse isolation in one device.

• Without fuse monitoring: Suitable where a basic non-monitored configuration is required.

• Box terminals: Supports a wide range of compatible conductor sizes within the specified limits.

• 45 mm cover level: Helps with panel and enclosure planning.

• 690 V insulation rating: Suitable for compatible low-voltage installations within the specified limits.

• 2,000-cycle typical mechanical life: Useful for applications requiring repeated switching.

• Active product status: Supports current procurement and replacement requirements.

Why Choose Siemens 3NP1123-1CA20?

The Siemens 3NP1123-1CA20 is a 160 A, 3-pole SENTRON 3NP1 fuse switch disconnector for NH000 fuse links, designed for mounting-plate installation with box terminals and a 45 mm cover level. The exact version is specified without fuse monitoring.

It is suitable for customers looking to buy or source Siemens fuse switch disconnectors for industrial power distribution, feeder protection, electrical-panel assembly, maintenance and replacement requirements.

For SB Smart, this product is best presented as a Siemens industrial electrical switching and protection component for supply and procurement across India.

Delivery Across India

SB Smart supplies Siemens industrial electrical products across Faridabad, Gurgaon/Gurugram, Delhi NCR, Haryana, Noida, Punjab, Mumbai and other major Indian cities.

Major delivery locations include:

• Faridabad

• Delhi

• Gurgaon/Gurugram

• Delhi NCR

• Noida

• Greater Noida

• Haryana

• Punjab

• Mumbai

• Pune

• Ahmedabad

• Bengaluru

• Hyderabad

• Chennai

• Kolkata

• Jaipur

• Chandigarh

• Lucknow

• Indore

• Surat

• Vadodara

• Nagpur

• Coimbatore

• And other major cities across India

Frequently Asked Questions

1. What is Siemens 3NP1123-1CA20?

The 3NP1123-1CA20 is a Siemens SENTRON 3NP1 fuse switch disconnector rated at 160 A, with a 3-pole configuration for NH000 fuse links.

2. Which fuse size is compatible?

The exact product is designed for NH000 fuse links.

3. Does this model have fuse monitoring?

No. The exact 3NP1123-1CA20 has no integrated safety/fuse monitoring design, although Siemens identifies fuse monitoring as an optional product extension for the family.

4. How many poles does it have?

It is a 3-pole fuse switch disconnector.

5. What is the rated current?

The rated operational current is 160 A at the specified reference temperature. Siemens also specifies temperature-dependent derating up to 55°C.

6. How is it installed?

It is designed for mounting-plate installation and supports horizontal or vertical mounting positions.

7. What type of terminals does it have?

The exact article uses box terminals.

8. What is the cover level?

The product has a 45 mm cover level.

9. What is the rated insulation voltage?

The rated insulation voltage is 690 V. Siemens also specifies an 8 kV surge withstand voltage.

10. Where can I buy Siemens 3NP1123-1CA20 in India?

SB Smart supplies Siemens industrial electrical products and fuse switch disconnectors in India for industrial buyers, panel builders, maintenance requirements and replacement procurement.