Description
The ABB 3BHB002000R0001, identified by the component marking B25835S2205K007 (EPCOS / TDK B25835 MKV series), is a high-voltage metallized polypropylene film snubber/damping capacitor module used in ABB medium-voltage drives (ACS6000 series) and UNITROL excitation systems. It is purpose-designed to absorb voltage spikes generated during IGCT or IGBT turn-off, damp high-frequency oscillations on the DC link, and stabilize the intermediate circuit voltage in multi-megawatt power conversion equipment.
Application Scenarios
A metals processing plant operating an ABB ACS6000 SD drive for a 6 MW rolling mill main motor began logging intermittent “Overvoltage DC Link” faults during high-acceleration sequences. Visual inspection of the inverter phase module revealed discolored snubber capacitors with bulging end seals. The maintenance crew replaced all six ABB 3BHB002000R0001 (B25835S2205K007) snubber capacitors in the affected phase leg—matching the original 2 µF / 3100 V AC specification and axial lead pitch. Post-replacement, DC link overshoot was eliminated, the overvoltage fault cleared completely, and the drive returned to full-rated operation without further incident. For asset owners, proactively stocking verified ABB 3BHB002000R0001 spares prevents minor capacitor degradation from cascading into IGCT damage or unplanned drive outages that can cost tens of thousands per hour.
Parameter
Main Parameters Value/DescriptionProduct Model 3BHB002000R0001 (Component: B25835S2205K007 / EPCOS MKV Series)Manufacturer ABB (Capacitor element sourced from EPCOS/TDK, Germany)Product Category High Voltage Snubber / Damping Film Capacitor ModuleCapacitance (Cn) 2 µF ±10% (Code K)Rated Voltage (Ur) 3100 V AC (50/60 Hz); peak DC withstand per IEC 61071Dielectric Material Metallized Polypropylene Film (Self-healing property)Loss Tangent (tan δ) ≤ 0.001 at 1 kHz, 23 °C (very low dissipation factor)Max. RMS Current (Irms) Approx. 8–12 A @ 10 kHz (dependent on ambient & cooling — see datasheet curve)Safety Feature Internal overpressure disconnector (mechanical break-contact on failure)Lead Style / Pitch Axial leads / Faston tabs; typical lead spacing 25.4 mm (1″)Case / Encapsulation Aluminum can or flame-retardant epoxy-sealed cylindrical housing, UL 94 V-0Operating Temp. Range -25 °C to +85 °C (Ta); derating applies above +70 °CDimensions (Typical) Ø ≈ 35–42 mm × L ≈ 60–80 mm (varies by production batch)Mounting Method Bolt / snap-in to busbar bracket or via insulated cable to snubber terminals
Technical Principles and Innovative Values
- Innovation Point 1 – Self-Healing Metallized Film Technology: The ABB 3BHB002000R0001 employs metalized polypropylene dielectric that automatically clears minor dielectric breakdowns by vaporizing the local metal layer around the defect, restoring insulation integrity and extending service life compared to foil-type capacitors.
- Innovation Point 2 – Optimized for High dV/dt Snubber Duty: Unlike general-purpose AC filtering caps, the B25835S2205K007 element is specified for high dI/dt tolerance and low equivalent series inductance (ESL), making it suitable for absorbing nanosecond-scale voltage transients at IGCT/IGBT turn-off in 3.3–6.6 kV class inverters.
- Innovation Point 3 – Built-In Overpressure Disconnector: An internal mechanical fuse/disconnector severs the circuit if internal pressure rises due to end-of-life degradation, preventing short-circuit failure modes and protecting adjacent DC link components—a critical safety feature in high-energy drive cabinets.
- Innovation Point 4 – Direct Form-Fit Replacement for ABB Drive BOMs: The ABB 3BHB002000R0001 is listed in the official spare parts catalog for ACS6000 inverter stacks and UNITROL 6000/6800 excitation cubicles, ensuring correct voltage class, lead geometry, and clearance/creepage distances without field modification.
