Product Description

Siemens 3NW20NNSF Fuse Holder – 20A, 550V AC for 3NW NS Fuses

The Siemens 3NW20NNSF is a BS-type fuse holder designed specifically for compatible Siemens 3NW NS fuse links. The exact article has a 20 A rated current, 550 V AC/DC maximum voltage, 80 kA short-circuit breaking capacity, and SF size. Siemens documentation identifies the product in the fuse holders for 3NW NS fuses and isolating links range.

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

Siemens 3NW20NNSF Fuse Holder

The 3NW20NNSF is part of the Siemens 3NW fuse-holder range developed for specific 3NW NS-type fuse links.

Its main purpose is to provide the mechanical mounting and electrical connection for the compatible fuse link. Siemens' published product information places the article under “Fuse holders (for fuses Type 3NW NS) & Isolating link.”

20 A Rated Current

The exact 3NW20NNSF is rated at 20 A. Siemens' published pricing documentation lists the article at 20 A, while product data confirms the same rated current.

The holder's current rating should be considered together with the selected fuse link and the complete electrical protection system.

550 V AC/DC Rating

The 3NW20NNSF is specified for a maximum voltage of 550 V AC/DC. Product documentation identifies the article with a 550 V rating.

The actual operating voltage of the installation should always be checked before selection.

80 kA Breaking Capacity

The 3NW20NNSF has a specified 80 kA short-circuit breaking capacity. Siemens-related technical documentation identifies the same 80 kA rating for this fuse-holder family.

This high short-circuit rating makes the holder suitable for compatible industrial electrical protection arrangements where the available fault current can be substantial.

SF Size

The exact 3NW20NNSF is identified with SF size in current product information.

The physical size and construction of the holder must match the corresponding 3NW NS fuse link.

Designed for 3NW NS Fuse Links

The 3NW20NNSF is specifically designed for 3NW NS fuse types rather than the TIA, TSA, TIS, TSS and TSDS families.

This distinction is important because Siemens uses different holder families for different 3NW fuse configurations. The 3NW20NNSF should therefore be selected only when the intended fuse is compatible with the 3NW NS system.

Fuse Holder, Not the Fuse Link

The 3NW20NNSF is a fuse holder and does not itself provide the complete overcurrent-protection function.

The installed fuse link provides the circuit protection, while the holder provides:

• Mechanical mounting

• Electrical connection

• Secure fuse positioning

• A compatible interface for the fuse link

The fuse and holder should always be matched according to their ratings and physical configuration.

Front-Connected Fuse Holder

Available technical documentation identifies the 3NW20NNSF as a standard fuse-holder unit suitable for front-connected arrangements. It is designed for installation in electrical panels and fuse-protection assemblies.

This construction can be useful where accessible front-side wiring and fuse replacement are required.

Locking Fuse Carrier

Product descriptions for the 3NW20NNSF identify a fuse-holder arrangement with a locking carrier that holds the fuse link in position during insertion and withdrawal. This supports controlled handling of the fuse link within the holder.

The exact installation and operating procedure should follow the applicable equipment and electrical-safety instructions.

Standards and Industrial Use

Published technical documentation states that the Siemens BS fuse holders comply with relevant standards including IS 13703-2, BS 88 Part 1 & 2 and IEC 60269-2-1 for the corresponding fuse-holder range.

This makes the product relevant to industrial low-voltage fuse-protection assemblies where compatible standards and components are required.

Suitable for Industrial Electrical Panels

The 3NW20NNSF can be used in compatible:

• Industrial electrical panels

• Low-voltage distribution systems

• Feeder protection assemblies

• Electrical equipment

• Control panels

• Machinery protection circuits

• Fuse replacement installations

• Maintenance applications

Actual application should be based on the complete protection design, fuse specifications and system fault level.

Fuse Replacement and Maintenance

The 3NW20NNSF is useful when an existing compatible fuse holder needs replacement or when a new electrical panel requires a dedicated holder for a Siemens 3NW NS fuse.

Before replacing a holder, verify:

• Fuse type

• Rated current

• Voltage rating

• Fuse size

• Physical arrangement

• Terminal configuration

• Compatibility with the selected fuse

Related Siemens 3NW NS Holder

Siemens documentation lists the 3NW20NNSF alongside the 3NW32NNSF as holders for 3NW NS fuse types. It also lists 3NW32NNSL as a 32 A isolating link.

This allows customers to select the appropriate component for the required current and function.

Standard Package Quantity

Siemens' published pricing documentation lists the 3NW20NNSF with a standard package quantity of 10 pieces.

This is useful for:

• Panel-building stock

• Maintenance inventory

• Spare-part procurement

• Industrial electrical projects

• Dealer stock

Commercial ordering quantities should be confirmed before placing an order.

Suitable for Electrical Panel Builders and Industrial Buyers

The Siemens 3NW20NNSF 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 3NW series fuse holder

• Article number 3NW20NNSF

• 20 A rated current

• 550 V AC/DC maximum voltage

• 80 kA short-circuit breaking capacity

• SF size

• Designed for 3NW NS fuse links

• BS-type fuse holder

• Suitable for compatible industrial fuse-protection assemblies

• Front-connected arrangement

• Locking fuse carrier

• Standard package quantity: 10 pieces

Benefits

• 20 A capacity: Suitable for compatible 20 A fuse-protection assemblies.

• 550 V rating: Supports compatible higher-voltage low-voltage applications within the specified limit.

• 80 kA breaking capacity: Suitable for installations with high prospective short-circuit current within the rated conditions.

• Dedicated 3NW NS compatibility: Designed specifically for the applicable Siemens NS fuse-link range.

• Locking carrier: Helps maintain the fuse link securely during insertion and withdrawal.

• Front-connected design: Convenient for compatible panel installations.

• Standardized Siemens accessory: Suitable for replacement and procurement of compatible fuse holders.

• 10-piece standard pack: Useful for maintenance stock and panel-building requirements.

Why Choose Siemens 3NW20NNSF?

The Siemens 3NW20NNSF is a dedicated 20 A BS-type fuse holder for Siemens 3NW NS fuse links, with a 550 V AC/DC rating and 80 kA short-circuit rating.

Its dedicated compatibility with the 3NW NS fuse family makes it suitable for industrial electrical panels, fuse-protection assemblies, maintenance and replacement applications.

For SB Smart, this product is best presented as a Siemens industrial electrical accessory for fuse protection, procurement and replacement requirements across India.

Delivery Across India

SB Smart supplies Siemens industrial electrical products and accessories 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 3NW20NNSF?

The 3NW20NNSF is a Siemens 20 A BS-type fuse holder designed for compatible 3NW NS fuse links.

2. What is its rated current?

The rated current is 20 A.

3. What is its voltage rating?

The holder is rated up to 550 V AC/DC.

4. What is the short-circuit rating?

The specified short-circuit breaking capacity is 80 kA.

5. Which fuse type is compatible?

It is designed for Siemens 3NW NS fuse links.

6. Is 3NW20NNSF itself a fuse?

No. It is a fuse holder. The compatible fuse link provides the actual circuit protection.

7. Does it have a locking carrier?

Product documentation describes a locking carrier for holding the fuse link during insertion and withdrawal.

8. What is the standard package quantity?

The published Siemens pricing documentation lists 10 pieces as the standard package quantity.

9. What other 3NW NS holder is available?

Siemens also lists 3NW32NNSF, a 32 A holder for 3NW NS fuse types.

10. Where can I buy Siemens 3NW20NNSF in India?

SB Smart supplies Siemens industrial electrical products and fuse accessories in India, including compatible Siemens 3NW fuse holders and HRC fuse components for industrial procurement, maintenance and replacement requirements.