Bachmann NT255

Bachmann NT255 is a power supply module used in Bachmann modular automation systems. It supplies the operating voltages required by CPUs and other modules connected through the system backplane, with an 18–34 V DC input and 45 W output power. Up to 55 W is available for temporary peak loads, while the main +5 V output supports up to 6 A.

The module also provides +15 V and -15 V outputs at 0.5 A each, together with electronic reverse polarity protection, input voltage monitoring, galvanic isolation, status indication, and a power-fail signal. For replacement or maintenance projects, the exact model and part number should be checked against the existing installation.

Product Identification

Key Specifications

Power Supply Function

The power supply module forms part of the internal power architecture of a Bachmann automation system. It converts the incoming DC supply into the voltages required by the CPU and other modules installed through the backplane.

The unit provides three output voltage levels: +5 V, +15 V, and -15 V. The +5 V output is rated at 6 A, with an 8 A peak capability, while the ±15 V outputs support 0.5 A each. These outputs are intended to supply the connected system hardware rather than function as a general-purpose external DC power supply.

Several protection and monitoring functions support reliable system operation. Electronic reverse polarity protection helps prevent damage from incorrect input polarity, while input voltage monitoring can generate a power-fail message when the supply condition falls outside the required range. Galvanic isolation provides separation between the input, system, and ground circuits.

System Compatibility

This module is designed for Bachmann's modular automation architecture and works with backplane-connected system components. Its suitability therefore depends on the configuration of the complete control system rather than on electrical specifications alone.

When selecting a replacement, the original model, part number, backplane configuration, input supply, required output capacity, and environmental conditions should be checked. This is particularly important when maintaining older automation equipment, where the replacement component needs to correspond with an established system configuration.

The information on the original module label is usually the most useful starting point. Providing the exact part number can help identify the required component before availability and delivery requirements are confirmed.

NT255 and NT255 CC

The standard version and the NT255 CC ColdClimate version are available for different operating environments. The standard unit is identified by part number 00031426-00, while the ColdClimate version uses 00031427-00.

Both versions provide the same basic power supply function and output configuration. The ColdClimate variant is intended for applications where lower temperatures and environmental conditions such as condensation need to be considered.

The correct version should be determined from the original equipment documentation, module identification, and actual installation environment rather than by appearance alone.

Applications

The Bachmann NT255 is used in Bachmann-based industrial automation and control systems where internal DC power is required for CPUs and other connected modules. Typical requirements can occur during system maintenance, equipment repair, control system expansion, and preparation of critical spare parts.

Selection should be based on the complete system configuration rather than output power alone. The connected modules, backplane arrangement, incoming supply, environmental conditions, and required version all need to be considered when confirming suitability.

Ordering Information

For sourcing, customers can provide the complete model or part number together with the required quantity, product condition requirements, application information, and delivery destination.

The standard part number is 00031426-00. If the existing installation uses the ColdClimate version, the required component should be confirmed as NT255 CC, 00031427-00.

Providing the original identification information at the beginning of the sourcing process helps reduce model selection errors and allows availability, condition, quantity, and delivery requirements to be checked more efficiently.

Frequently Asked Questions

What is Bachmann NT255?

It is a power supply module for Bachmann modular automation systems, providing the internal supply voltages required by the CPU and other backplane-connected modules.

What is the input voltage range?

The specified input voltage range is 18–34 V DC.

What are the main output ratings?

The module provides +5 V at 6 A, with an 8 A peak capability, together with +15 V and -15 V at 0.5 A each. The rated output power is 45 W, with up to 55 W available for temporary peak loads.

What is the difference between the standard and ColdClimate versions?

The standard version is identified by 00031426-00, while the ColdClimate version is 00031427-00. The latter is intended for installations where lower temperatures and condensation-related environmental conditions need to be considered.

What information is needed for a replacement quotation?

The original part number is the most useful reference. Quantity, product condition requirements, existing system information, and delivery destination can also be provided to support availability and sourcing checks.

Request a Quote

Need 00031426-00 or 00031427-00 for an existing Bachmann automation system? Send us the original part number, required quantity, product condition requirements, and delivery destination. Yueyang Tongtu can check the available supply and provide sourcing and delivery information based on your requirements.