Safety relay expansion — what it is
The ABB 2TLA010017R0100 is a JSR3T expansion module for safety relay systems. It extends the contact and monitoring capacity of a base safety relay without adding a separate logic path — useful when a single safety function needs more output contacts or a wider monitoring zone than the base unit provides. The module sits within the same safety circuit architecture, so it inherits the base relay's SIL/PL rating and does not introduce a new risk assessment point.