1756-TBCH module you mentioned is a Terminal Base Connector (TBC) module used in Allen-Bradley ControlLogix® programmable logic controllers (PLCs) from Rockwell Automation.
1756-TBS6H AB Rockwell Power Module is a power supply module designed for use in the Allen-Bradley ControlLogix series of programmable logic controllers (PLCs).
1756-RMC1 AB Rockwell Power Module is a power supply module designed for use in the Allen-Bradley ControlLogix series of programmable logic controllers (PLCs).
1756-TBCH module you mentioned is a Terminal Base Connector (TBC) module used in Allen-Bradley ControlLogix® programmable logic controllers (PLCs) from Rockwell Automation.
1756-TBS6H AB Rockwell Power Module is a power supply module designed for use in the Allen-Bradley ControlLogix series of programmable logic controllers (PLCs).
1756-RMC1 AB Rockwell Power Module is a power supply module designed for use in the Allen-Bradley ControlLogix series of programmable logic controllers (PLCs).