Siemens SIRIUS 3RB1257-0KB40 overload relay, 125 to 500 A, DC 24 V, for full motor protection, discontinued type.
The 3RB1257-0KB40: Designed for panel integration, this relay mounts onto S10/S12 contactors or individually on a DIN rail. The straight-through main circuit and screw-terminal auxiliary connections simplify wiring in motor control centers.
It covers 125 to 500 A, making it suitable for large motor protection applications in the S10/S12 frame size.
It supports trip classes 5 through 30, giving flexibility for different motor start profiles and protection requirements.
As a current-production item, it is sourced to order against an RFQ through standard Siemens distribution channels.
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