Bachmann NT255 Power Supply Module

Reliable and Efficient Power Supply for Industrial Systems

The BACHMANN NT255 power supply module is designed to provide reliable power to CPUs and backplane-supplied modules in industrial automation systems. With decades of engineering expertise, BACHMANN has developed the NT255 to deliver outstanding performance, enhanced efficiency, and longevity.

Leveraging advanced technologies, such as planar transformer designs and coolPCB technology, the NT255 achieves higher efficiency and reduces local heating, preventing premature aging of components. These innovations ensure long-term stability and operational reliability. Moreover, the module’s reduced weight improves resistance to shock and vibrations, making it suitable for demanding industrial environments.

Despite its primary focus on durability and longevity, the NT255 is packed with exceptional features. It offers up to 80% longer buffer time during short voltage drops and provides generous power reserves (up to 55 W peak power). These capabilities ensure that your system remains secure and operational even under challenging conditions.

Key Features

Input Voltage Range: 18 V DC to 34 V DC
Output Power: 45 W (55 W peak power)
Galvanic Isolation: Between input and system, input and ground
Electronic Reverse Polarity Protection: Safeguards against incorrect connections
State Indicators: Differentiates between supply failures and internal errors
Monitored Voltages: Includes both supply voltage and output voltage monitoring
Powerfail Signal: Provides early warning for CPU module failure
Compact Design: Features a lightweight, robust construction to withstand shock and vibration

Technical Specifications

Feature	Specification
Input Voltage Range	18 V DC to 34 V DC
Input Voltage (Peak)	+40 V (for < 1 second)
Power Consumption	Max. 68 W
Reverse Polarity Protection	Electronic
Starting Current Limitation	Max. 8 A after 5 ms
Fuse	SMD fuse 7 A (device defect protection)
Output Power	45 W (55 W peak)
Output Voltage / Output Current	+5 V / 6 A (8 A peak)
	+15 V / 0.5 A
	-15 V / 0.5 A
Power-fail Bypass	18 ms (power-fail message after 3 ms)
State Display	LEDs (Power, Error, Ready)
Galvanic Isolation	500 V (input/system), 100 V (input/ground)
Operating Temperature	-30 °C to +60 °C
Storage Temperature	-40 °C to +85 °C
Relative Humidity (Operation)	5% to 95% (non-condensing)
Relative Humidity (Storage)	5% to 95% (non-condensing)
Pollution Degree (IEC 60664-1)	2 (non-condensing)
Approvals/Certifications	CE, UKCA, cULus, ABS, BV, DNV, KR, LR, NK, RINA

Applications and Benefits

The BACHMANN NT255 power supply module is ideal for a wide range of industrial automation systems. It powers CPUs and other backplane-supplied modules with ease, while its galvanic isolation ensures safe operation in complex environments. Its advanced protection features, such as reverse polarity protection and overload safeguards, provide enhanced system reliability.

With its efficient design and reliable performance, the NT255 ensures that critical equipment remains operational even during power interruptions. The 80% longer buffer time during short voltage dips guarantees smooth system operation in the face of transient power disturbances, making it an excellent choice for mission-critical applications.