Description
Key Technical Specifications
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Model Number: SAFT 25F380
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Manufacturer: ABB (Sweden)
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Rated Voltage: 3 × 380 VAC (+10 % / –15 %)
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Rated Current: 25 A @ 50 °C ambient
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Frequency: 50 / 60 Hz
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Leakage Current: < 3.5 mA (per phase, typical)
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Attenuation: ≥ 60 dB @ 150 kHz…30 MHz (CISPR 11 Class A)
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Climate Range: –25 °C…+70 °C (operating)
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Degree of Protection: IP00 (chassis plate mount)
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Connections: M5 screw studs, 3-wire + PE
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Weight: 0.8 kg
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Approvals: CE, UL508, IEC 60939
ABB SAFT 25F380
Field Application & Problem Solved
Paper-mill winder drives run 380 V but sit 30 m from the MCC; PWM reflections ride the cable shield back into the 24 V logic and you get random “earth-fault” trips. Bolt the SAFT 25F380 on the drive input studs and the 20 kHz carrier is down 45 dB at the cabinet bulkhead—no more false trips, no extra panel space burned. Same filter works on overhead cranes: the festoon cable acts like an antenna and wipes out two-way radio; insert the filter at the bridge-panel feeder and the noise floor drops below –60 dBm. Core value: it’s a bolt-on plate that keeps you inside CISPR 11 without redesigning the whole panel.
Paper-mill winder drives run 380 V but sit 30 m from the MCC; PWM reflections ride the cable shield back into the 24 V logic and you get random “earth-fault” trips. Bolt the SAFT 25F380 on the drive input studs and the 20 kHz carrier is down 45 dB at the cabinet bulkhead—no more false trips, no extra panel space burned. Same filter works on overhead cranes: the festoon cable acts like an antenna and wipes out two-way radio; insert the filter at the bridge-panel feeder and the noise floor drops below –60 dBm. Core value: it’s a bolt-on plate that keeps you inside CISPR 11 without redesigning the whole panel.
Installation & Maintenance Pitfalls (Expert Tips)
Earth stud must see PE within 50 mm – The filter shunts HF noise to ground; if you run a 300 mm wire to the PE bar you just built a nice 1 µH antenna. Use the shortest braid you can bolt.
Mount it on steel, not aluminum – Aluminum surface has higher impedance at 1 MHz; you lose 6 dB attenuation. Paint-free steel bulkhead gives best shunt path.
Tighten to 3 Nm – no more – Over-torque cracks the ferrite core and you’ll see a 20 °C hot-spot that halves filter life. Snug with a calibrated wrench and stop.
Current de-rate above 45 °C – The choke saturates at 30 A when ambient hits 70 °C. If your cabinet runs hot, drop the drive current limit to 22 A or go to the next size (50F380).
Earth stud must see PE within 50 mm – The filter shunts HF noise to ground; if you run a 300 mm wire to the PE bar you just built a nice 1 µH antenna. Use the shortest braid you can bolt.
Mount it on steel, not aluminum – Aluminum surface has higher impedance at 1 MHz; you lose 6 dB attenuation. Paint-free steel bulkhead gives best shunt path.
Tighten to 3 Nm – no more – Over-torque cracks the ferrite core and you’ll see a 20 °C hot-spot that halves filter life. Snug with a calibrated wrench and stop.
Current de-rate above 45 °C – The choke saturates at 30 A when ambient hits 70 °C. If your cabinet runs hot, drop the drive current limit to 22 A or go to the next size (50F380).
ABB SAFT 25F380
Technical Deep Dive & Overview
The SAFT 25F380 is a passive L-C-L filter potted in epoxy and bolted to a steel plate. Differential-mode chokes knock the PWM carrier down while the Y-cap array shunts common-mode noise to PE. Because it’s IP00 you mount it inside the drive cubicle—no extra enclosure needed. The three M5 studs line up with ABB TyRak-S input lugs so you can land line-side lugs on top and drive lugs on bottom, keeping cable dress clean. Capacitors are 440 VAC metalized film with self-healing; ABB rates them for 100 000 h at 40 °C, so in a 30 °C panel you’re good for 15 years before C value drops 10 %.
The SAFT 25F380 is a passive L-C-L filter potted in epoxy and bolted to a steel plate. Differential-mode chokes knock the PWM carrier down while the Y-cap array shunts common-mode noise to PE. Because it’s IP00 you mount it inside the drive cubicle—no extra enclosure needed. The three M5 studs line up with ABB TyRak-S input lugs so you can land line-side lugs on top and drive lugs on bottom, keeping cable dress clean. Capacitors are 440 VAC metalized film with self-healing; ABB rates them for 100 000 h at 40 °C, so in a 30 °C panel you’re good for 15 years before C value drops 10 %.
