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Allen Bradley

Allen Bradley 20SD400NEN PowerFlex 400 A SCR Bus Supply

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ManufacturerAllen Bradley

Part number20SD400NEN

Amperage 400 Amp

Input Voltage 400/480 VAC

Number of Phases 3 Phase

Output Voltage 540 - 650 VDC

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CAGE: 9NK75

Converts AC to DC Bus 400 Amp Capacity 400/480 VAC Input 540-650 VDC Output Over-temperature Sensor RC Snubber Circuit

Product description

The Allen-Bradley 20SD400NEN is a PowerFlex 400 SCR Bus Supply designed to convert incoming 3-phase AC line voltage into a common DC bus voltage and current. It handles a 400 Amp continuous current and operates with input voltages of 400/480 VAC, providing an output of 540-650 VDC. This unit is essential for creating a centralized DC bus in multi-drive systems.

This SCR bus supply is a six-pulse, full-wave, three-phase rectifier unit featuring an over-temperature sensor and an RC snubber circuit for voltage dampening. It is designed for standalone operation and offers robust performance in industrial environments. The 20SD400NEN is often used in applications requiring a common DC bus for multiple VFDs, such as in large machine controls or coordinated drive systems.

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Technical specifications

Amperage	400 Amp
Input Voltage	400/480 VAC
Number of Phases	3 Phase
Output Voltage	540 - 650 VDC
Frequency	50-60 Hz
Rectifier Type	Six-pulse, full-wave SCR bridge
Enclosure	UL-NEMA Type Open (IP00)

Common applications

Multi-drive systems

Common DC bus applications

Large machine controls

Coordinated drive systems

Industrial power distribution

Compatible systems

PowerFlex drives Multi-drive systems

Also known as

Allen Bradley PowerFlex SCR Bus Supply AB 20SD400NEN 400A DC Bus Supply

Replaces / compatible with

This PowerFlex 400 SCR Bus Supply is designed to provide a common DC bus for multiple PowerFlex drives in a system.

Technical note

Expert tip

The UL-NEMA Type open enclosure (IP00) requires the unit to be installed in a suitable enclosure to protect it from environmental factors and ensure operator safety.

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Frequently asked questions

What is the primary function of the Allen-Bradley 20SD400NEN SCR Bus Supply?

The primary function of the Allen-Bradley 20SD400NEN SCR Bus Supply is to convert incoming 3-phase AC line voltage into a common DC bus voltage and current. This allows multiple AC drives to share a single DC bus, improving system efficiency and reducing component count.