The 3RK1901-3KA00: This plug is built for the HARAX connection system, which is a push-in termination method common on Siemens compact modules. You'll find it on modules in the 3RK1 family — the same footprint that goes into control cabinets and junction boxes on the plant floor. The HARAX technique means you push the stripped wire in, no tool needed, and it locks.
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