What it is and what it does
The Siemens 4EM5111-1CB00 is a single-phase commutating choke (line reactor) designed for use with converters and drives. It smooths the DC link current and limits di/dt during commutation, reducing harmonic distortion and protecting the converter's input rectifier from current spikes. Rated at 40.5 A continuous with a 45 A maximum, it handles the full-load current of a 230 V AC, 50 Hz single-phase drive system. The 0.62 mH inductance provides a 4% relative inductive voltage drop at rated current — typical for a line reactor that balances filtering against voltage drop.
What the ratings mean for fit
The 40.5 A rated current (Ith) is the continuous thermal current the choke can carry in free air at 40 °C ambient. That is the number to match against your drive's input current — not the peak or surge rating. The 45 A maximum is the short-term overload ceiling, not a continuous design point. At 0.62 mH, the choke's impedance at 50 Hz is about 0.195 Ω, yielding the 4% voltage drop. This is a standard value for a commutating choke — enough to limit fault current rise rates without dropping excessive voltage under load. The 18 W copper loss and 26 W iron loss total 44 W dissipation; plan for that heat in the enclosure, especially if the choke is mounted near other heat-sensitive components. IP00 means it is an open-frame component — no enclosure, no finger-safe cover. It must be installed inside a panel or enclosure that provides the required touch protection and environmental sealing. The screw-type terminals accept standard power wiring; torque to the manufacturer's specification for the wire gauge used.
Sourcing and lifecycle reality
Sourced to order through independent distribution. Availability and current pricing are confirmed at quote time against an RFQ.
Where it goes in the panel
Mount the choke between the AC line input and the converter's rectifier input terminals. Keep the power wiring short and routed away from control cables to avoid coupling switching noise into sensitive circuits. The open-frame construction (IP00) means it must be inside a grounded metal enclosure that meets the overall panel IP rating. Dimensions: 0.138 m deep, 0.097 m wide, 0.128 m tall. Verify the mounting footprint against the panel layout — the screw terminals need clearance for wire bending radius and tool access.