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Siemens NXD63S120A Miniature Circuit Breaker - 120A

Siemens NXD63S120A 3-Pole Miniature Circuit Breaker, 120A.

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ManufacturerSiemens

Part numberNXD63S120A

Type Miniature Circuit Breaker (MCB)

Rated current 120 A

Breaking capacity 6 kA

Tripping curve Type S

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Veteran-owned

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High current rating (120A) 6 kA breaking capacity Type S tripping characteristic 3-pole configuration Robust industrial design

Product description

The Siemens NXD63S120A is a 3-pole miniature circuit breaker (MCB) rated at 120A with a breaking capacity of 6kA. It features a Type S tripping characteristic, often used for specific industrial applications requiring higher current handling with a particular trip profile. This breaker ensures protection against overloads and short circuits in AC circuits up to 400V.

This MCB is suited for heavy-duty industrial environments where higher current loads are present. Its robust construction and precise tripping mechanism make it essential for safeguarding critical machinery and electrical infrastructure in manufacturing plants and heavy industries.

Stanlo Automation, a proud veteran-owned business, offers the Siemens NXD63S120A as part of our extensive surplus inventory. We are dedicated to providing reliable, high-quality automation components at competitive prices, ensuring your operations receive the support they need.

Technical specifications

Type	Miniature Circuit Breaker (MCB)
Rated current	120 A
Breaking capacity	6 kA
Tripping curve	Type S
Number of poles	3
Rated voltage	400 V AC
Frequency	50/60 Hz

Common applications

Industrial power distribution

Heavy machinery

Manufacturing plants

High-current circuits

Motor protection

Compatible systems

Suitable for AC power systems up to 400V with standard DIN rail mounting.

Also known as

Siemens NXD63S120A MCB Siemens 120A 3-pole breaker

Replaces / compatible with

This circuit breaker can replace older or inadequate overcurrent protection devices in industrial settings, ensuring compliance and enhanced safety.

Technical note

Expert tip

Ensure the Type S characteristic is appropriate for the specific load's inrush current requirements to prevent premature tripping or failure to trip.

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Frequently asked questions

What is the tripping characteristic of the Siemens NXD63S120A?

The Siemens NXD63S120A utilizes a Type S tripping characteristic. This specific curve is designed for industrial applications that require a different response to overcurrents compared to standard Type B, C, or D curves.