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M3452-H9C00

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M3452-H9C00
June 08, 2026

M3452-H9C00

The M3452-H9C00 is a solid‑state dynamic braking module manufactured by Bonitron (also branded under ABB/Reliance), designed for AC/DC drive systems to dissipate regenerative energy and prevent DC bus overvoltage during motor deceleration or overhauling loads. It integrates power switching and braking resistance into a compact, rugged enclosure for industrial high‑power applications.

Description

M3452-H9C00

The M3452-H9C00 is a solid‑state dynamic braking module manufactured by Bonitron (also branded under ABB/Reliance), designed for AC/DC drive systems to dissipate regenerative energy and prevent DC bus overvoltage during motor deceleration or overhauling loads. It integrates power switching and braking resistance into a compact, rugged enclosure for industrial high‑power applications.

General Description

The M3452‑H9C00 belongs to Bonitron’s M3452 series of combo braking units, which combine a high‑power transistor switch and a dedicated braking resistor in a single assembly. The “H9C” suffix indicates it is engineered for 460–480 VAC input, with a 760 VDC maximum DC bus rating, intended for medium‑to‑high horsepower drives. This model is discontinued by the original manufacturer but remains available as surplus or refurbished units, commonly used in retrofit and replacement projects.

Key Electrical Specifications

  • Input Voltage: 460–480 VAC, 3‑phase

  • Maximum DC Bus Voltage: 760 VDC

  • Rated Braking Current: 27 A peak

  • Continuous Power Dissipation: ~1.8 kW

  • Peak Braking Power: ~20 kW

  • Duty Cycle: 20% (standard for overhauling loads)

  • Resistance Value: Integrated non‑inductive power resistor (matched for 460 VAC operation)

  • Control Interface: Dry‑contact signal from drive; transistor‑switched braking between terminals 1 (‑) and 2 (+)

  • Status Indication: LED indicator illuminates when braking current (IB) is active

Mechanical and Environmental Characteristics

  • Enclosure: NEMA 1 rated, heavy‑gauge steel with protective finish for industrial environments

  • Dimensions: 19” H × 12” W × 12” D (approx. 483 mm × 305 mm × 305 mm)

  • Weight: 48 lb (21.8 kg)

  • Mounting: Floor or wall‑mountable; vertical installation recommended for heat dissipation

  • Operating Temperature: 0 °C to +40 °C (ambient)

  • Cooling: Convection cooling (no fans required); ribbed enclosure for enhanced heat transfer

  • Certifications: RoHS compliant; designed to meet industrial safety standards

  • Terminals: Heavy‑duty screw terminals for high‑current wiring

Performance and Reliability

The M3452‑H9C00 uses a wear‑less transistor switch (no mechanical contacts) for long service life and high reliability under repetitive braking cycles. The integrated non‑inductive resistor minimizes voltage spikes and ensures stable performance during rapid deceleration. It includes overvoltage protection and thermal shutdown to prevent damage from overload or overheating. Rigorous factory testing ensures consistent performance in harsh industrial conditions, including heavy vibration and wide temperature fluctuations.

Typical Applications

  • Dynamic Braking for AC Drives: Centrifuges, conveyors, cranes, hoists, and machine tools with frequent stop/start cycles

  • Overhauling Loads: Elevators, escalators, and downhill conveyors where motors act as generators

  • DC Bus Overvoltage Protection: Prevents drive shutdown or damage during regenerative energy feedback

  • High‑Power Industrial Systems: 460 VAC, 30–50 HP drive applications in manufacturing, material handling, and processing industries

  • Retrofit Projects: Replacement for older Bonitron or Reliance dynamic braking modules

Ordering and Compatibility Information

  • Part Number: M3452‑H9C00 (original Bonitron part; also referenced as M3452‑H9C0)

  • Status: Discontinued by manufacturer; available as new surplus, refurbished, or replacement units

  • Compatibility: Works with most 460–480 VAC PWM drives (ABB, Siemens, Allen‑Bradley, etc.)

  • Replacement Models: Bonitron M3452‑H9C‑R025 / R050 (updated resistor ratings) or equivalent third‑party braking modules


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