Siemens SIRIUS 3RB1253-0FB10 overload relay, 50…205 A, size S6, discontinued product, busbar main circuit, screw terminal aux, manual/auto/remote reset, monostable outputs, overload warning DC 24 V.
The 3RB1253-0FB10: Manual, automatic, and remote reset. Monostable outputs drop on trip and stay open until fault clears and reset cycles. Overload warning output at DC 24 V.
Size S6 mounts on a busbar system or individually. Auxiliary wiring is screw terminal.
No official successor order code is recorded. For a parametric replacement, look at the current SIRIUS 3RB3 series in size S6 with a similar 50…205 A range and adjustable trip class. Pin compatibility and busbar pitch may differ — verify the mounting footprint and auxiliary wiring before ordering.
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