The Siemens 4EP3701-1DS00 is a 3-phase commutating choke (line reactor) for converter applications, rated at 400 V AC, 50 Hz, with a continuous rated current of 25.2 A and a maximum current of 28 A. Its primary job is to limit the rate of current rise (di/dt) and reduce harmonic distortion on the input of a variable-frequency drive or DC drive — protecting the converter's rectifier diodes and smoothing the DC bus. The 1 mH inductance and 4% relative inductive voltage drop are the key sizing parameters: this choke is designed for a drive whose nominal input current matches the 25.2 A rating, not for general line filtering.
The 25.2 A rated current is the continuous thermal limit at 40 °C ambient with thermal class B insulation — meaning the winding temperature rise stays within 80 K above ambient under rated load. For a drive with a 25 A input, this choke runs within its design margin. The 28 A maximum is the overload ceiling; sustained operation above 25.2 A will exceed the thermal class B limit and shorten insulation life. At DC rated value, the choke carries 34.3 A — useful if the same physical choke is applied on the DC link side of a converter, but the AC 25.2 A rating governs the standard line-side installation. Total power loss splits into 49 W in the coil and 12 W in the iron core, summing to 61 W at rated load — this heat must be dissipated into the surrounding air. IP00 means no enclosure; the choke is intended for mounting inside a panel with forced or natural convection, not in a washdown or dusty environment.
Mounting and connection
Dimensions are 0.178 m wide, 0.153 m high, 0.105 m deep. No DIN-rail clip — this is a bolt-down component; plan for a mounting plate or chassis bracket.
This is not a cross-reference for miniature circuit breakers like 5SJ3140-7 or 5SL6606-7YA — those serve overcurrent protection, not line reactance. The 4EP3701-1DS00 is a purpose-built choke; there is no drop-in functional equivalent from the breaker family.