Overview
The Siemens 3RB2906-2JG1 is a current transformer rated 10-100 A, designed for straight-through installation with the 3RB22/23/24 solid-state overload relays in Size S2/S3. It mounts stand-alone, carries an IP20 finger-safe touch protection front, and weighs 200 g.
Function & operation
This transformer provides the current sensing input for the 3RB22/23/24 overload relay family. The straight-through design means the main circuit conductor passes directly through the transformer window — no primary winding connections. The auxiliary circuit is not used; the transformer output connects to the relay's sensing terminals.
Applications
The 3RB2906-2JG1 is used with Siemens 3RB22/23/24 solid-state overload relays in motor protection circuits for pumps, fans, conveyors, and compressors. The straight-through transformer simplifies wiring in retrofit or new panel builds where the main conductor passes through without additional terminals.