MITSUBISHI FR-BU-H15K Brake Unit | Replacement, Equivalent & Selection Guide
The MITSUBISHI FR-BU-H15K is a dedicated dynamic braking unit designed for use with MITSUBISHI’s FR-A500 Series variable frequency drives rated at 15kW (H15K). It dissipates regenerative energy during motor deceleration, preventing DC bus overvoltage faults and enabling precise stop control in high-inertia applications. Konmask.com provides genuine and compatible sourcing options with full selection guidance for engineers and procurement teams.
Technical Specifications
- Model / SKU: FR-BU-H15K
- Brand: Mitsubishi Electric Corporation
- Series: FR-BU (Brake Unit for FR-A500 / FR-F500 Series)
- Applicable Drive Capacity: 15kW (H15K)
- Input Voltage: 3-Phase AC 380–480V (High-voltage H-type)
- DC Bus Voltage Range: 660–800V DC
- Braking Transistor: Built-in IGBT chopper circuit
- Braking Duty Cycle: 10% ED (continuous braking with external resistor)
- External Resistor Required: Yes — FR-BR or equivalent braking resistor
- Protection Class: IP00 (open chassis, panel-mount)
- Cooling Method: Forced air cooling
- Weight: Approx. 1.67 kg
- Country of Origin: Japan
- HS Code: 8504.40
Compatible Replacement & Equivalent Models
The following models are commonly evaluated as replacements or equivalents for the FR-BU-H15K. Always verify DC bus voltage, drive series compatibility, and braking duty cycle before substitution:
- Direct OEM Replacement: MITSUBISHI FR-BU2-H15K (next-generation FR-BU2 series — improved duty cycle, same drive compatibility)
- Cross-Brand Equivalent: Yaskawa CDBR-4015B (15kW, 380–480V braking chopper — verify terminal wiring)
- Cross-Brand Equivalent: Siemens 6SE6400-4BD16-5CA0 (braking module for MICROMASTER 440 — confirm bus voltage match)
- Generic Compatible: Third-party 15kW IGBT braking chopper units rated 660–800V DC (confirm duty cycle ≥10% ED)
- Resistor Pairing: MITSUBISHI FR-BR-H15K external braking resistor (recommended OEM pairing)
⚠️ Substitution note: Always confirm the replacement unit’s DC bus voltage range, braking torque rating, and physical mounting dimensions before installation. Contact Konmask engineers for free compatibility review.
Why Choose the Original Model
- ✅ Guaranteed Drive Compatibility — Factory-matched to FR-A500 / FR-F500 series; no parameter adjustment required
- ✅ Optimized IGBT Chopper Circuit — Tuned for MITSUBISHI DC bus characteristics; minimizes overvoltage trip risk
- ✅ Proven Field Reliability — Widely deployed in Japanese and global industrial installations since the 1990s
- ✅ OEM Documentation Support — Full MITSUBISHI wiring diagrams, instruction manuals, and parameter guides available
- ✅ Regulatory Compliance — CE, UL, and CCC certified as part of the FR-A500 drive system
Typical Applications
- Crane and hoist systems requiring rapid, controlled deceleration
- Centrifuge and high-inertia rotating equipment
- Elevator and escalator drive systems
- Winding and unwinding machines (tension control)
- Press brakes and stamping machines with frequent stop-start cycles
- Conveyor systems with regenerative load profiles
System Compatibility
- Primary Drive Series: MITSUBISHI FR-A520-15K, FR-A540-15K, FR-F520-15K, FR-F540-15K
- Braking Resistor: MITSUBISHI FR-BR-H15K (external, required for operation)
- Mounting: Panel-mount, IP00 — install inside a ventilated control cabinet
- Wiring: Connect to P/+ and PR terminals on the FR-A500 drive; refer to MITSUBISHI FR-BU instruction manual
- Multiple Units: Up to 4 FR-BU units can be paralleled for increased braking capacity on larger systems
Selection Guide
Use the following criteria to select the correct brake unit for your application:
- Step 1 – Match Drive Capacity: FR-BU-H15K is rated for 15kW drives. For other capacities: H7.5K (7.5kW), H22K (22kW), H37K (37kW).
- Step 2 – Confirm Voltage Class: H-type = High voltage (380–480V, 3-phase). L-type = Low voltage (200–240V). Verify your drive’s input voltage.
- Step 3 – Assess Braking Duty: Standard 10% ED suits most applications. For continuous braking (>10% ED), use FR-BU2 series or add parallel units.
- Step 4 – Select Braking Resistor: Pair with FR-BR-H15K or calculate custom resistor value using MITSUBISHI’s braking resistor selection formula.
- Step 5 – Verify Replacement: If substituting with FR-BU2-H15K, confirm firmware version of the drive supports the BU2 interface.
Quality Assurance & Sourcing
Konmask.com applies a structured verification process to all brake unit inventory:
- Source Verification: Units traced to authorized MITSUBISHI distributors or OEM-certified supply channels
- Physical Inspection: Nameplate data, terminal condition, IGBT module integrity, and housing checked against OEM specs
- Functional Test: DC bus input and chopper output signal verified on bench prior to shipment
- Documentation: Inspection report, packing list, and commercial invoice issued with every order
- Warranty: 90-day functional warranty; extended options available on request
How to Order
- Add to Cart — For standard single-unit orders, proceed directly to checkout.
- Request a Quote — For bulk orders (3+ units), OEM pricing, or custom lead times, email [email protected].
- Provide System Details — Share your drive model number and application specs for compatibility confirmation.
- Payment Terms — T/T (Wire Transfer), PayPal, and credit card accepted. Net-30 available for qualified B2B accounts.
- Shipping — DHL Express, FedEx, UPS available. Tracking and inspection report issued within 24 hours of dispatch.
Replacement & Compatibility FAQ
Q: Can I use FR-BU2-H15K as a direct replacement for FR-BU-H15K?
A: In most cases yes — the FR-BU2 series is the successor with improved duty cycle. Verify your drive’s firmware and terminal labeling before swapping. Contact us for a free compatibility check.
Q: Do I need an external braking resistor?
A: Yes. The FR-BU-H15K contains only the chopper circuit — an external resistor (FR-BR-H15K or equivalent) must be connected to the P and PR terminals to dissipate braking energy.
Q: Can this unit be used with non-MITSUBISHI drives?
A: Technically possible if the DC bus voltage (660–800V) and terminal configuration match, but it is not recommended without engineering review. Contact us with your drive specs.
Q: What happens if I select the wrong capacity brake unit?
A: An undersized unit will overheat and trigger thermal protection; an oversized unit may not activate correctly. Always match the brake unit kW rating to the drive’s rated output.
Q: Is this unit in stock?
A: Contact us at [email protected] for real-time stock status and lead time confirmation.
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