ABB Bailey INPTM01 – Automatic Bus Transfer for Critical Systems

The ABB Bailey INPTM01 handles automatic bus transfer duties in power distribution panels. This module measures 160 mm in width and 100 mm in height. It weighs approximately 0.62 kg for straightforward handling during installation.

Internal Architecture and Energy Storage

This bus transfer module contains three separate circuit boards inside its housing. One board manages voltage sensing, while another handles the switching logic. The third board provides isolation and surge protection for sensitive components. Total internal capacitance reaches 330 µF for stable operation. Therefore, the ABB Bailey INPTM01 can ride through power dips up to 50 milliseconds. It stores no battery, which eliminates regular replacement cycles.

Input Channels and Relay Outputs

You will find two independent bus input channels on this device. Each channel supports a nominal voltage of 120V AC or 240V AC. You can connect field wiring using the front-terminal screw blocks. The module includes six screw terminals for AC inputs and control signals. It also offers two relay outputs for breaker trip and close commands. Each relay contact handles up to 5A at 250V AC.

Transfer Performance and Monitoring

The device monitors source and backup bus voltages continuously. It then initiates a transfer within 35 milliseconds after detecting a fault. For additional safety, the module verifies synchronism before completing any transfer. The ABB Bailey INPTM01 also performs automatic retransfer when the primary bus recovers. You can adjust retransfer delay from 0 to 300 seconds via internal jumpers.

Installation Environment and Indicators

The ABB Bailey INPTM01 operates reliably from -20°C to +65°C ambient temperature. It requires no external cooling fan for normal operation. You can mount this unit on any standard DIN rail inside a panel. The front LED indicators show bus status, transfer mode, and alarm conditions clearly.

Below is a complete summary of its technical specifications.

This flexibility suits generator-backed systems or dual utility feeds perfectly. Consequently, the module reduces downtime and protects critical loads from voltage sags. The ABB Bailey INPTM01 delivers reliable performance for legacy Bailey systems and new installations alike.